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Irritable bowel syndrome (IBS) is a group of symptoms—including abdominal pain and changes in the pattern of bowel movements without any evidence of underlying damage.[1] These symptoms occur over a long time, often years.[2] It has been classified into four main types depending on whether diarrhea is common, constipation is common, both are common, or neither occurs very often (IBS-D, IBS-C, IBS-M, or IBS-U respectively).[1] IBS negatively affects quality of life and may result in missed school or work.[8] Disorders such as anxiety, major depression, and chronic fatigue syndrome are common among people with IBS.[1][9]

Irritable bowel syndrome
Other namesSpastic colon, nervous colon, mucous colitis, spastic bowel[1]
SpecialtyGastroenterology
SymptomsDiarrhea, constipation, abdominal pain[1]
Usual onsetBefore 45 years old[1]
DurationLong term[2]
CausesUnknown[2]
Diagnostic methodBased on symptoms, exclusion of other diseases[3]
Differential diagnosisCeliac disease, non-celiac gluten sensitivity, microscopic colitis, inflammatory bowel disease, bile acid malabsorption, colon cancer[3][4]
TreatmentSymptomatic (dietary changes, medication, probiotics, counseling)[5]
PrognosisNormal life expectancy[6]
Frequency12.5% (developed world)[1][7]

The causes of IBS are not clear.[2] Theories include combinations of gut–brain axis problems, gut motility disorders, pain sensitivity, infections including small intestinal bacterial overgrowth, neurotransmitters, genetic factors, and food sensitivity.[2] Onset may be triggered by an intestinal infection,[10] or stressful life event.[11] IBS is a functional gastrointestinal disorder.[1] Diagnosis is based on symptoms in the absence of worrisome features and once other potential conditions have been ruled out.[3] Worrisome features include onset at greater than 50 years of age, weight loss, blood in the stool, or a family history of inflammatory bowel disease.[3] Other conditions that may present similarly include celiac disease, microscopic colitis, inflammatory bowel disease, bile acid malabsorption, and colon cancer.[3]

There is no known cure for IBS.[5] Treatment is carried out to improve symptoms.[5] This may include dietary changes, medication, probiotics, and counseling.[5] Dietary measures include increasing soluble fiber intake, a gluten-free diet, or a short-term diet low in fermentable oligosaccharides, disaccharides, monosaccharides, and polyols (FODMAPs).[3][12][13] The medication loperamide may be used to help with diarrhea while laxatives may be used to help with constipation.[3] Antidepressants may improve overall symptoms and reduce pain.[3] Patient education and a good doctor–patient relationship are an important part of care.[3][14]

About 10 to 15% of people in the developed world are believed to be affected by IBS.[1][7] It is more common in South America and less common in Southeast Asia.[3] It is twice as common in women as men and typically occurs before age 45.[1] The condition appears to become less common with age.[3] IBS does not affect life expectancy or lead to other serious diseases.[6] The first description of the condition was in 1820 while the current term "irritable bowel syndrome" came into use in 1944.[15]

Contents

ClassificationEdit

IBS can be classified as either diarrhea-predominant (IBS-D), constipation-predominant (IBS-C), or with alternating stool pattern (IBS-A) or pain-predominant.[16] In some individuals, IBS may have an acute onset and develop after an infectious illness characterized by two or more of: fever, vomiting, diarrhea, or positive stool culture. This postinfective syndrome has consequently been termed "postinfectious IBS" (IBS-PI).

Signs and symptomsEdit

The primary symptoms of IBS are abdominal pain or discomfort in association with frequent diarrhea or constipation and a change in bowel habits.[17] Symptoms usually are experienced as acute attacks that subside within one day, but recurrent attacks are likely.[18] There may also be urgency for bowel movements, a feeling of incomplete evacuation (tenesmus), bloating, or abdominal distension.[19] In some cases, the symptoms are relieved by bowel movements.[14] People with IBS, more commonly than others, have gastroesophageal reflux, symptoms relating to the genitourinary system, chronic fatigue syndrome, fibromyalgia, headache, backache, and psychiatric symptoms such as depression and anxiety.[9][19] About a third of men and women who have IBS also report sexual dysfunction typically in the form of a reduction in libido.[20]

CauseEdit

While the causes of IBS are still unknown, it is believed that the entire gut–brain axis is affected.[21][22]

The risk of developing IBS increases six-fold after acute gastrointestinal infection. Postinfection, further risk factors are young age, prolonged fever, anxiety, and depression.[23] Psychological factors, such as depression or anxiety, have not been shown to cause or influence the onset of IBS, but may play a role in the persistence and perceived severity of symptoms.[24] Nevertheless, they may worsen IBS symptoms and quality of life.[24] Antibiotic use also appears to increase the risk of developing IBS.[25] Research has found that genetic defects in innate immunity and epithelial homeostasis increase the risk of developing both post-infectious as well as other forms of IBS.[26]

Post-infectiousEdit

Approximately 10 percent of IBS cases are triggered by an acute gastroenteritis infection. Genetic defects relating to the innate immune system and epithelial barrier as well as high stress and anxiety levels appear to increase the risk of developing post-infectious IBS. Post-infectious IBS usually manifests itself as the diarrhea-predominant subtype. Evidence has demonstrated that the release of high levels of proinflammatory cytokines during acute enteric infection causes increased gut permeability leading to translocation of the commensal bacteria across the epithelial barrier; this in turn can result in significant damage to local tissues, which can develop into chronic gut abnormalities in sensitive individuals. However, increased gut permeability is strongly associated with IBS regardless of whether IBS was initiated by an infection or not.[26] A link between small intestinal bacterial overgrowth and tropical sprue has been proposed to be involved in the cause of post-infectious IBS.[27]

StressEdit

Publications suggesting the role of brain-gut "axis" appeared in the 1990s[28] and childhood physical and psychological abuse is often associated with the development of IBS.[29] It is believed that psychological stress may trigger IBS in predisposed individuals.[30]

Given the high levels of anxiety experienced by people with IBS and the overlap with conditions such as fibromyalgia and chronic fatigue syndrome, a potential model of IBS involves a disruption of the stress system. The stress response in the body involves the HPA axis and the sympathetic nervous system, both of which have been shown to operate abnormally in people with IBS. Psychiatric illness or anxiety precedes IBS symptoms in two-thirds of people with IBS, and psychological traits predispose previously healthy people to developing IBS after gastroenteritis.[31][32]

BacteriaEdit

Small intestinal bacterial overgrowth occurs with greater frequency in people who have been diagnosed with IBS compared to healthy controls. SIBO is most common in diarrhea-predominate IBS but also occurs in constipation-predominant IBS more frequently than healthy controls. Symptoms of SIBO include bloating, abdominal pain, diarrhea or constipation among others. IBS may be the result of the immune system interacting abnormally with gut microbiota resulting in an abnormal cytokine signalling profile.[33] The spirochete Brachyspira pilosicoli may also play a role.[34]

Certain bacteria are found in lower or higher abundance when compared with healthy individuals. Generally Bacteroidetes, Firmicutes, and Proteobacteria are increased and Actinobacteria, Bifidobacteria, and Lactobacillus are decreased. Within the human gut, there are common phylum found. The most common is Firmicutes. This includes Lactobacillus, which is found to have a decrease in people with IBS, and Streptococcus, which is shown to have an increase in abundance. Within this phylum, species in the class Clostridia are shown to have an increase, specifically Ruminococcus and Dorea. The family Lachnospiraceae presents an increase in IBS-D patients. The second most common phylum is Bacteroidetes. In people with IBS, the Bacteroidetes phylum has been shown to have an overall decrease, but an increase in the species Bacteroides. IBS-D shows a decrease for the phylum Actinobacteria and an increase in Proteobacteria, specifically in the Enterobacteriaceae family. [35]

FungusEdit

There is growing evidence that alterations of gut microbiota (dysbiosis) are associated with the intestinal manifestations of IBS, but also with the psychiatric morbidity that coexists in up to 80% of people with IBS.[36] The role of the gut mycobiota, and especially of the abnormal proliferation of the yeast Candida albicans in some people with IBS, was under investigation as of 2005.[37]

ProtozoaEdit

 
Prevalence of protozoal infections in industrialized countries (United States and Canada) in the 21st century[38][39]

Protozoal infections can cause symptoms that mirror specific IBS subtypes,[40] e.g., infection by certain substypes of blastocystis hominis (blastocystosis).[41][42]

As of 2017, evidence indicates that blastocystis colonisation occurs more commonly in IBS affected individuals and is a possible risk factor for developing IBS.[43] Dientamoeba fragilis has also been considered a possible organism to study, though it is also found in people without IBS.[44]

Vitamin DEdit

Vitamin D deficiency is more common in individuals affected by irritable bowel syndrome.[45][46]

GeneticsEdit

SCN5A mutations are found in a small number of people who have IBS, particularly the constipation-predominant variant (IBS-C).[47][48] The resulting defect leads to disruption in bowel function, by affecting the Nav1.5 channel, in smooth muscle of the colon and pacemaker cells.

MechanismEdit

Genetic, environmental, and psychological factors seem to be important in the development of IBS. Studies have shown that IBS has a genetic component even though there is a predominant influence of environmental factors.[49]

There is evidence that abnormalities occur in the gut flora of individuals who have IBS, such as reduced diversity, a decrease in bacteria belonging to the phylum Bacteroidetes, and an increase in those belonging to the phylum Firmicutes.[50] The changes in gut flora are most profound in individuals who have diarrhoea predominant IBS. Antibodies against common components (namely flagellin) of the commensal gut flora are a common occurrence in IBS affected individuals.[51]

Chronic low-grade inflammation commonly occurs in IBS affected individuals with abnormalities found including increased enterochromaffin cells, intraepithelial lymphocytes, and mast cells resulting in chronic immune-mediated inflammation of the gut mucosa.[21][52] IBS has been reported in greater quantities in multigenerational families with IBS than in the regular population.[53] It is believed that psychological stress can induce increased inflammation and thereby cause IBS to develop in predisposed individuals.[30]

DiagnosisEdit

No specific laboratory or imaging tests can diagnose irritable bowel syndrome. Diagnosis should be based on symptoms, the exclusion of worrisome features, and the performance of specific investigations to rule out organic diseases that may present similar symptoms.[3][54]

The recommendations for physicians are to minimize the use of medical investigations.[55] Rome criteria are usually used. They allow the diagnosis to be based only on symptoms, but no criteria based solely on symptoms is sufficiently accurate to diagnose IBS.[56][57] Worrisome features include onset at greater than 50 years of age, weight loss, blood in the stool, iron-deficiency anemia, or a family history of colon cancer, celiac disease, or inflammatory bowel disease.[3] The criteria for selecting tests and investigations also depends on the level of available medical resources.[24]

Rome criteriaEdit

The Rome IV criteria includes recurrent abdominal pain, on average, at least 1 day/week in the last 3 months, associated with two or more of the following criteria:

  • Related to defecation
  • Associated with a change in frequency of stool
  • Associated with a change in form (appearance) of stool.

Physicians may choose to use one of these guidelines or may simply choose to rely on their own anecdotal experience with past patients. The algorithm may include additional tests to guard against misdiagnosis of other diseases as IBS. Such "red flag" symptoms may include weight loss, gastrointestinal bleeding, anemia, or nocturnal symptoms. However, red flag conditions may not always contribute to accuracy in diagnosis; for instance, as many as 31% of people with IBS have blood in their stool, many possibly from hemorrhoidal bleeding.[58]

The diagnostic algorithm identifies a name that can be applied to the person's condition based on the combination of symptoms of diarrhea, abdominal pain, and constipation. For example, the statement "50% of returning travelers had developed functional diarrhea while 25% had developed IBS" would mean half the travelers had diarrhea while a quarter had diarrhea with abdominal pain. While some researchers believe this categorization system will help physicians understand IBS, others have questioned the value of the system and suggested all people with IBS have the same underlying disease but with different symptoms.[59]

Differential diagnosisEdit

Colon cancer, inflammatory bowel disease, thyroid disorders, and giardiasis can all feature abnormal defecation and abdominal pain. Less common causes of this symptom profile are carcinoid syndrome, microscopic colitis, bacterial overgrowth, and eosinophilic gastroenteritis; IBS is, however, a common presentation, and testing for these conditions would yield low numbers of positive results, so it is considered difficult to justify the expense.[60] Conditions that may present similarly include celiac disease, microscopic colitis, inflammatory bowel disease, bile acid malabsorption, colon cancer, and dyssynergic defecation.[3]

Ruling out parasitic infections, lactose intolerance, small intestinal bacterial overgrowth, and coeliac disease is recommended before a diagnosis of irritable bowel syndrome is made.[54] An upper endoscopy with small bowel biopsies is necessary to identify the presence of celiac disease.[61] Colonoscopy is recommended for people over 50 years old.[54] Nevertheless, this criterion is insufficient since microscopic colitis can not be identified without performing random colonic biopsies. An ileocolonoscopy with biopsies is useful to exclude Crohn's disease.[61]

Some people, managed for years for IBS, may have non-celiac gluten sensitivity (NCGS).[4] Gastrointestinal symptoms of IBS are clinically indistinguishable from those of NCGS, but the presence of any of the following non-intestinal manifestations suggest a possible NCGS: headache or migraine, "foggy mind", chronic fatigue,[62] fibromyalgia,[63][64][65] joint and muscle pain,[62][63][66] leg or arm numbness,[62][63][66] tingling of the extremities,[62][66] dermatitis (eczema or skin rash),[62][66] atopic disorders,[62] allergy to one or more inhalants, foods or metals[62][63] (such as mites, graminaceae, parietaria, cat or dog hair, shellfish, or nickel[63]), depression,[62][63][66] anxiety,[63] anemia,[62][66] iron-deficiency anemia, folate deficiency, asthma, rhinitis, eating disorders,[63] neuropsychiatric disorders (such as schizophrenia,[66][67] autism,[63][66][67] peripheral neuropathy,[66][67] ataxia,[67] attention deficit hyperactivity disorder[62]) or autoimmune diseases.[62] An improvement with a gluten-free diet of immune-mediated symptoms, including autoimmune diseases, once having reasonably ruled out coeliac disease and wheat allergy, is another way to realize a differential diagnosis.[62]

InvestigationsEdit

Investigations are performed to exclude other conditions:

MisdiagnosisEdit

People with IBS are at increased risk of being given inappropriate surgeries such as appendectomy, cholecystectomy, and hysterectomy due to being misdiagnosed as other medical conditions.[68] Some common examples of misdiagnosis include infectious diseases, coeliac disease,[69] Helicobacter pylori,[70][71] parasites (non-protozoal).[40][72][73] The American College of Gastroenterology recommends all people with symptoms of IBS be tested for coeliac disease.[74]

Bile acid malabsorption is also sometimes missed in people with diarrhea-predominant IBS. SeHCAT tests suggest around 30% of people with D-IBS have this condition, and most respond to bile acid sequestrants.[75]

Chronic use of certain sedative-hypnotic drugs, especially the benzodiazepines, may cause irritable bowel-like symptoms that can lead to a misdiagnosis of irritable bowel syndrome.[76]

ComorbiditiesEdit

Several medical conditions, or comorbidities, appear with greater frequency in people with IBS.

  • Neurological/psychiatric: A study of 97,593 individuals with IBS identified comorbidities such as headache, fibromyalgia, and depression.[77] IBS occurs in 51% of people with chronic fatigue syndrome and 49% of people with fibromyalgia, and psychiatric disorders occur in 94% of people with IBS.[9]
  • Inflammatory bowel disease: IBS may be a type of low-grade inflammatory bowel disease.[78] Researchers have suggested IBS and IBD are interrelated diseases,[79] noting that people with IBD experience IBS-like symptoms when their IBD is in remission.[80][81] A three-year study found that patients diagnosed with IBS were 16.3 times more likely to be diagnosed with IBD during the study period.[82] Serum markers associated with inflammation have also been found in patients with IBS.
  • Abdominal surgery: People with IBS were at increased risk of having unnecessary gall bladder removal surgery not due to an increased risk of gallstones, but rather to abdominal pain, awareness of having gallstones, and inappropriate surgical indications.[83] These people also are 87% more likely to undergo abdominal and pelvic surgery and three times more likely to undergo gallbladder surgery.[84] Also, people with IBS were twice as likely to undergo hysterectomy.[85]
  • Endometriosis: One study reported a statistically significant link between migraine headaches, IBS, and endometriosis.[86]
  • Other chronic disorders: Interstitial cystitis may be associated with other chronic pain syndromes, such as irritable bowel syndrome and fibromyalgia. The connection between these syndromes is unknown.[87]

ManagementEdit

A number of treatments have been found to be effective, including fiber, talk therapy, antispasmodic and antidepressant medication, and peppermint oil.[88][89][90]

DietEdit

FODMAPEdit

A 2018 systematic review found that although there is evidence of improved IBS symptoms with a low FODMAP diet; the evidence is of very low quality.[91] Symptoms most likely to improve include urgency, flatulence, bloating, abdominal pain, and altered stool output. One national guideline advises a low FODMAP diet for managing IBS when other dietary and lifestyle measures have been unsuccessful.[92] The diet restricts various carbohydrates which are poorly absorbed in the small intestine, as well as fructose and lactose, which are similarly poorly absorbed in those with intolerances to them. Reduction of fructose and fructan has been shown to reduce IBS symptoms in a dose-dependent manner in people with fructose malabsorption and IBS.[93]

FODMAPs are fermentable oligo-, di-, monosaccharides and polyols, which are poorly absorbed in the small intestine and subsequently fermented by the bacteria in the distal small and proximal large intestine. This is a normal phenomenon, common to everyone. The resultant production of gas potentially results in bloating and flatulence.[94] Although FODMAPs can produce certain digestive discomfort in some people, not only do they not cause intestinal inflammation, but they avoid it, because they produce beneficial alterations in the intestinal flora that contribute to maintain the good health of the colon.[95][96][97] FODMAPs are not the cause of irritable bowel syndrome nor other functional gastrointestinal disorders, but rather a person develops symptoms when the underlying bowel response is exaggerated or abnormal.[94]

A low-FODMAP diet consists in restricting them from the diet. They are globally trimmed, rather than individually, which is more successful than for example restricting only fructose and fructans, which are also FODMAPs, as is recommended for those with fructose malabsorption.[94]

A low-FODMAP diet might help to improve short-term digestive symptoms in adults with irritable bowel syndrome,[98][92][99][13] but its long-term follow-up can have negative effects because it causes a detrimental impact on the gut microbiota and metabolome.[100][92][13][101] It should only be used for short periods of time and under the advice of a specialist.[102] A low-FODMAP diet is highly restrictive in various groups of nutrients and can be impractical to follow in the long-term.[103] More studies are needed to assess the true impact of this diet on health.[92][13]

In addition, the use of a low-FODMAP diet without verifying the diagnosis of IBS may results in misdiagnosis of other conditions such as celiac disease.[104] Since the consumption of gluten is suppressed or reduced with a low-FODMAP diet, the improvement of the digestive symptoms with this diet may not be related to the withdrawal of the FODMAPs, but of gluten, indicating the presence of an unrecognized celiac disease, avoiding its diagnosis and correct treatment, with the consequent risk of several serious health complications, including various types of cancer.[104][105]

FiberEdit

Some evidence suggests soluble fiber supplementation (e.g., psyllium/ispagula husk) is effective.[12] It acts as a bulking agent, and for many people with IBS-D, allows for a more consistent stool. For people with IBS-C, it seems to allow for a softer, moister, more easily passable stool.

However, insoluble fiber (e.g., bran) has not been found to be effective for IBS.[106][107] In some people, insoluble fiber supplementation may aggravate symptoms.[108][109]

Fiber might be beneficial in those who have a predominance of constipation. In people who have IBS-C, soluble fiber can reduce overall symptoms, but will not reduce pain. The research supporting dietary fiber contains conflicting small studies complicated by the heterogeneity of types of fiber and doses used.[110]

One meta-analysis found only soluble fiber improved global symptoms of irritable bowel, but neither type of fiber reduced pain.[110] An updated meta-analysis by the same authors also found soluble fiber reduced symptoms, while insoluble fiber worsened symptoms in some cases.[111] Positive studies have used 10–30 grams per day of ispaghula (psyllium).[112][113] One study specifically examined the effect of dose, and found 20 g of ispaghula (psyllium) were better than 10 g and equivalent to 30 g per day.[114]

MedicationEdit

Medications that may be useful include antispasmodics such as dicyclomine and antidepressants.[115] With respect to antidepressants both selective serotonin reuptake inhibitors and tricyclic antidepressants appear useful.[115][116] Both H1-antihistamines and mast cell stabilizers have also shown efficacy in reducing pain associated with visceral hypersensitivity in IBS.[21]

LaxativesEdit

For people who do not adequately respond to dietary fiber, osmotic laxatives such as polyethylene glycol, sorbitol, and lactulose can help avoid "cathartic colon" which has been associated with stimulant laxatives.[117] Lubiprostone is a gastrointestinal agent used for the treatment of constipation-predominant IBS.

AntispasmodicsEdit

The use of antispasmodic drugs (e.g., anticholinergics such as hyoscyamine or dicyclomine) may help people who have cramps or diarrhea. A meta-analysis by the Cochrane Collaboration concludes if seven people are treated with antispasmodics, one of them will benefit.[115] Antispasmodics can be divided into two groups: neurotropics and musculotropics. Musculotropics, such as mebeverine, act directly at the smooth muscle of the gastrointestinal tract, relieving spasm without affecting normal gut motility.[citation needed] Since this action is not mediated by the autonomic nervous system, the usual anticholinergic side effects are absent.[118] The antispasmodic otilonium may also be useful.[119]

Discontinuation of proton pump inhibitorsEdit

Proton pump inhibitors (PPIs) used to suppress stomach acid production may cause bacterial overgrowth leading to IBS symptoms. Discontinuation of PPIs in selected individuals has been recommended as it may lead to an improvement or resolution of IBS symptoms.[120]

AntidepressantsEdit

There is good evidence that low doses of tricyclic antidepressants can be effective for IBS. However, the evidence is less robust as to the effectiveness of other antidepressant classes such as SSRIs. Antidepressants are not effective for IBS in people with depression, possible because lower doses of antidepressants than the doses used to treat depression are required for relief of IBS.[121]

Selective serotonin reuptake inhibitor antidepressants (SSRIs), because of their serotonergic effect, have been studied to see if they help IBS, especially people who are constipation predominant but as of 2015 the evidence is that SSRIs do not help.[122]

Other agentsEdit

Magnesium aluminum silicates and alverine citrate drugs can be effective for IBS.[123][109]

Evidence is conflicting about the benefit of antidepressants in IBS. Some meta-analyses have found a benefit, while others have not.[124] With TCAs about one in three people improve.[125]

Rifaximin may be useful as a treatment for IBS symptoms, including abdominal bloating and flatulence, although relief of abdominal distension is delayed.[30][126] It is especially useful where small intestinal bacterial overgrowth is involved.[30]

In individuals with IBS and low levels of vitamin D supplementation is recommended. Some evidence suggests that vitamin D supplementation may improve symptoms of IBS, but further research is needed before it can be recommended as a specific treatment for IBS.[45][46]

Domperidone, a dopamine receptor blocker and a parasympathomimetic, has been shown to reduce bloating and abdominal pain as a result of an accelerated colon transit time and reduced fecal load, that is, a relief from 'hidden constipation'; defecation was similarly improved.[127]

Reduction in IBS symptoms occurs following antibiotic therapy for small intestinal bacterial overgrowth.[128] However, recent research has shown that the lactulose hydrogen breath test does not actually measure SIBO, and that SIBO is unlikely to be the cause of IBS.[129]

Psychological therapiesEdit

There is low quality evidence from studies with poor methodological quality that psychological therapies can be effective in the treatment of IBS; however there are no significant adverse effects from psychological therapies for IBS.[121] The mind-body or brain-gut interactions has been proposed for IBS, and is gaining increasing research attention.[107] Hypnosis can improve mental well-being, and cognitive behavioural therapy can provide psychological coping strategies for dealing with distressing symptoms, as well as help suppress thoughts and behaviours that increase the symptoms of IBS.[107][109] Although the evidence base for effectiveness of psychotherapy and hypnosis is weak[121] and such therapies are in general not recommended,[68] in treatment-resistant cases where pharmacological therapies over a period of at least 12 months have failed to give relief, NICE clinical guidelines recommend that consideration should be given to psychological treatment strategies such as cognitive behavioural therapy [CBT], hypnotherapy and/or psychological therapy.[130]

Reducing stress may reduce the frequency and severity of IBS symptoms. Techniques that may be helpful include:

Alternative medicineEdit

A meta-analysis found no benefits of acupuncture relative to placebo for IBS symptom severity or IBS-related quality of life.[132]

ProbioticsEdit

Probiotics can be beneficial in the treatment of IBS; taking 10 billion to 100 billion beneficial bacteria per day is recommended for beneficial results. However, further research is needed on individual strains of beneficial bacteria for more refined recommendations.[126][133] Probiotics have positive effects such as enhancing the intestinal mucosal barrier, providing a physical barrier, bacteriocin production (resulting in reduced numbers of pathogenic and gas-producing bacteria), reducing intestinal permeability and bacterial translocation, and regulating the immune system both locally and systemically among other beneficial effects.[68] Probiotics may also have positive effects on the gut-brain axis by their positive effects countering the effects of stress on gut immunity and gut function.[134]

A number of probiotics have been found to be effective, including Lactobacillus plantarum,[68] and Bifidobacteria infantis;[135] but one review found only Bifidobacteria infantis showed efficacy.[136] B. infantis may have effects beyond the gut via it causing a reduction of proinflammatory cytokine activity and elevation of blood tryptophan levels, which may cause an improvement in symptoms of depression.[137] Some yogurt is made using probiotics that may help ease symptoms of IBS.[138] A probiotic yeast called Saccharomyces boulardii has some evidence of effectiveness in the treatment of irritable bowel syndrome.[139]

Certain probiotics have different effects on certain symptoms of IBS. For example, Bifidobacterium breve, B. longum, and Lactobacillus acidophilus have been found to alleviate abdominal pain. B. breve, B. infantis, L. casei, or L. plantarum species alleviated distension symptoms. B. breve, B. infantis, L. casei, L. plantarum, B. longum, L. acidophilus, L. bulgaricus, and Streptococcus salivarius ssp. thermophilus have all been found to affect flatulence levels. Most clinical studies show probiotics do not improve straining, sense of incomplete evacuation, stool consistency, fecal urgency, or stool frequency, although a few clinical studies did find some benefit of probiotic therapy. The evidence is conflicting for whether probiotics improve overall quality of life scores.[140]

Probiotics may exert their beneficial effects on IBS symptoms via preserving the gut microbiota, normalisation of cytokine blood levels, improving the intestinal transit time, decreasing small intestine permeability, and by treating small intestinal bacterial overgrowth of fermenting bacteria.[140]

Herbal remediesEdit

Peppermint oil appears useful.[141] In a meta-analysis it was found to be superior to placebo for improvement of IBS symptoms, at least in the short term.[142] An earlier meta-analysis suggested the results of peppermint oil were tentative as the number of people studied was small and blinding of those receiving treatment was unclear.[88] Safety during pregnancy has not been established, however, and caution is required not to chew or break the enteric coating; otherwise, gastroesophageal reflux may occur as a result of lower esophageal sphincter relaxation. Occasionally, nausea and perianal burning occur as side effects.[107] Iberogast, a multi-herbal extract, was found to be superior in efficacy to placebo.[143]

Only limited evidence exists for the effectiveness of other herbal remedies for IBS. As with all herbs, it is wise to be aware of possible drug interactions and adverse effects.[107]

EpidemiologyEdit

 
Percentage of population with IBS reported in various studies in different countries

The prevalence of IBS varies by country and by age range examined. The bar graph at right shows the percentage of the population reporting symptoms of IBS in studies from various geographic regions (see table below for references). The following table contains a list of studies performed in different countries that measured the prevalence of IBS and IBS-like symptoms:

Percentage of population reporting symptoms of IBS in various studies from various geographic areas
Country Prevalence Author/year Notes
Canada 6%[144] Boivin, 2001
Japan 10%[145] Quigley, 2006 Study measured prevalence of GI abdominal pain/cramping
United Kingdom 8.2%[146]

10.5%[147]

Ehlin, 2003

Wilson, 2004

Prevalence increased substantially 1970–2004
United States 14.1%[148] Hungin, 2005 Most undiagnosed
United States 15%[144] Boivin, 2001 Estimate
Pakistan 14%[149] Jafri, 2007 Much more common in 16–30 age range. 56% male, 44% female
Pakistan 34%[150] Jafri, 2005 College students
Mexico City 35%[151] Schmulson, 2006 n=324. Also measured functional diarrhea and functional vomiting. High rates attributed to "stress of living in a populated city."
Brazil 43%[145] Quigley, 2006 Study measured prevalence of GI abdominal pain/cramping
Mexico 46%[145] Quigley, 2006 Study measured prevalence of GI abdominal pain/cramping

GenderEdit

Women are around two to three times more likely to be diagnosed with IBS and four to five times more likely to seek specialty care for it than men.[152] These differences likely reflect a combination of both biological (sex) and social (gender) factors. People diagnosed with IBS are usually younger than 45 years old.[1] Studies of females with IBS show symptom severity often fluctuates with the menstrual cycle, suggesting hormonal differences may play a role.[153] Endorsement of gender-related traits has been associated with quality of life and psychological adjustment in IBS.[154] Gender differences in healthcare-seeking may also play a role.[155] Gender differences in trait anxiety may contribute to lower pain thresholds in women, putting them at greater risk for a number of chronic pain disorders.[156] Finally, sexual trauma is a major risk factor for IBS, with as many as 33% of those affected reporting such abuse. Because women are at higher risk of sexual abuse than men, sex-related risk of abuse may contribute to the higher rate of IBS in women.[157]

HistoryEdit

The concept of an "irritable bowel" appeared in the Rocky Mountain Medical Journal in 1950. The term was used to categorize people who developed symptoms of diarrhea, abdominal pain, and constipation, but where no well-recognized infective cause could be found. Early theories suggested the irritable bowel was caused by a psychosomatic or mental disorder.[158]

Society and cultureEdit

NamesEdit

Other names for the condition used in the past included irritable colon, spastic colon, nervous colon, colitis, mucous colitis, and spastic bowel.[159][160]

The terminologies that refer to the colon are inaccurate and discouraged, since the disorder is not limited to this section of the digestive tract. Similarly, the term "colitis" is not accurate as inflammation is not present.[160][161][162] Other reasons why these terms were abandoned were to reflect the understanding that the disorder is not a figment of a person’s imagination.[159]

EconomicsEdit

United StatesEdit

The aggregate cost of irritable bowel syndrome in the United States has been estimated at $1.7–10 billion in direct medical costs, with an additional $20 billion in indirect costs, for a total of $21.7–30 billion.[8] A study by a managed care company comparing medical costs for people with IBS to non-IBS controls identified a 49% annual increase in medical costs associated with a diagnosis of IBS.[163] People with IBS incurred average annual direct costs of $5,049 and $406 in out-of-pocket expenses in 2007.[164] A study of workers with IBS found that they reported a 34.6% loss in productivity, corresponding to 13.8 hours lost per 40 hour week.[165] A study of employer-related health costs from a Fortune 100 company conducted with data from the 1990s found people with IBS incurred US $4527 in claims costs vs. $3276 for controls.[166] A study on Medicaid costs conducted in 2003 by the University of Georgia's College of Pharmacy and Novartis found IBS was associated in an increase of $962 in Medicaid costs in California, and $2191 in North Carolina. People with IBS had higher costs for physician visits, outpatients visits, and prescription drugs. The study suggested the costs associated with IBS were comparable to those found for people with asthma.[167]

ResearchEdit

Individuals with IBS have been found to have decreased diversity and numbers of bacteroidetes microbiota. Preliminary research into the effectiveness of fecal microbiota transplant in the treatment of IBS has been very favourable with a 'cure' rate of between 36 percent and 60 percent with remission of core IBS symptoms persisting at 9 and 19 months follow up.[168][169] Treatment with probiotic strains of bacteria has shown to be effective, though not all strains of microorganisms confer the same benefit and adverse side effects have been documented in a minority of cases.[170]

There is increasing evidence for the effectiveness of mesalazine (5-aminosalicylic acid) in the treatment of IBS.[171] Mesalazine is a drug with anti-inflammatory properties that has been reported to significantly reduce immune mediated inflammation in the gut of IBS affected individuals with mesalazine therapy resulting in improved IBS symptoms as well as feelings of general wellness in IBS affected people. It has also been observed that mesalazine therapy helps to normalise the gut flora which is often abnormal in people who have IBS. The therapeutic benefits of mesalazine may be the result of improvements to the epithelial barrier function.[172] Treatment based on "abnormally" high IgG antibodies cannot be recommended.[173]

Differences in visceral sensitivity and intestinal physiology have been noted in IBS. Mucosal barrier reinforcement in response to oral 5-HTP was absent in IBS compared to controls.[174] IBS/IBD individuals are less often HLA DQ2/8 positive than in upper functional gastrointestinal disease and healthy populations.[175]

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