A menstrual cup is a feminine hygiene product that is inserted into the vagina during menstruation. Its purpose is to prevent menstrual fluid (blood containing uterine lining) from leaking onto clothes. Menstrual cups are usually made of flexible medical grade silicone and shaped like a bell with a stem. The stem is used for insertion and removal. The bell-shaped cup seals against the vaginal wall just below the cervix. Every 4–12 hours (depending on the amount of flow), the cup is removed, emptied, rinsed, and reinserted.
Unlike tampons and pads, cups collect menstrual fluid rather than absorbing it. One cup is reusable for up to five years or more. This makes their long-term cost lower than that of disposable tampons or pads, though the initial cost is higher. Menstrual cups are also promoted as more practical and eco-friendly than pads and tampons.
The menstrual cup is first folded or pinched, and then inserted into the vagina. It will normally unfold automatically and create a light seal against the vaginal walls. In some cases, the user may need to twist the cup or flex the vaginal muscles to ensure the cup is fully open. In most cases, the cup migrates upward and sits against the cervix. If correctly inserted, the cup shouldn't leak or cause any discomfort, as tampons can. Those who are familiar with inserting a non-applicator tampon should learn faster how to insert a cup, though there is still a learning curve. There are various folding techniques for insertion. One of the most common folds is in the shape of the letter C.
If lubrication is necessary for insertion, it should be water-based, as some lubricant ingredients can be damaging to the silicone.
After 4–24 hours of use (depending on the amount of flow), the cup is removed by reaching up to its stem to find the base. Simply pulling on the stem is not recommended to remove the cup, as that can create suction. The base of the cup is pinched to release the seal, and the cup is removed. After emptying, a menstrual cup should be rinsed or wiped and reinserted. It can be washed with a mild soap, and sterilized in boiling water for a few minutes at the end of the cycle. Alternatively, sterilizing solutions (usually developed for baby bottles and breast pump equipment) may be used to soak the cup. Specific cleaning instructions vary by brand.
- When using a menstrual cup, the menstrual fluid is collected after it flows from the cervix and is held in liquid form. With tampons, liquid is absorbed and held in semi-coagulated form against the cervix. This reduces odors.
- Menstrual cups collect menstrual fluid inside the vagina and generally do not leak (if emptied often enough and inserted properly). Some women have experienced leakage due to improper use or cup size. For example, a menstrual cup may leak if it is not inserted correctly and does not pop open completely and seal against the walls of the vagina.
- If a user needs to track the amount of menses she is producing (e.g., for medical reasons), a menstrual cup allows her to do so accurately. Some cups even have measuring marks on them.
A 2011 randomized controlled trial in Canada investigated whether menstrual cups are a viable alternative to tampons and found that approximately 91% of women in the menstrual cup group said they would continue to use the cup and recommend it to others. In a 1995 clinical study involving 51 women, 23 of the participants (45%) found menstrual cups to be an acceptable way of managing menstrual flow.
In a randomized controlled feasibility study in rural western Kenya, adolescent primary school girls were provided menstrual cups or sanitary pads over traditional menstrual care items, such as cloth or tissue. Girls provided menstrual cups had a lower prevalence of sexually transmitted infections than control groups. Also, the prevalence of bacterial vaginosis was lower among cup users compared with sanitary pad users or those continuing usual practice. After six months of provision, menstrual cup users were free from embarrassing leakage, odor, and could engage in class activities and sport without humiliation and being teased.
Access to water and hygieneEdit
- Cleaning a menstrual cup in a public toilet can pose problems as the handwashing sinks are usually, though not always, in a public space rather than in the toilet cubicle. Some manufacturers suggest wiping out the cup with a clean tissue and cleaning the cup at the next private opportunity. The user could also carry a small bottle of water in her handbag to rinse the cup privately over the toilet. Another option is to use wet wipes. Since menstrual cups may only need to be emptied every 6–24 hours, many users do not have to empty them in public restrooms but rather in the comfort of their own home.
- A lack of clean water and soap for handwashing, needed before inserting the cup, presents a problem to women in developing countries. Insertion requires thorough washing of the cup and hands to avoid introducing new bacteria into the vagina, which may heighten the risk of UTIs and other infections. Disposable and resusable pads do not demand the same hand hygiene, though reusable pads also require access to water for washing out pads.
- Due to the fact that menstrual cups require boiling once a month, this can be a problem in developing countries if there is a lack of water, fire wood and good hygiene practices. However, other options currently in use, such as rags that are washed, may be less hygienic.
- Removing a menstrual cup can be messy. Sometimes menstrual blood can spill during removal, although many women remove the device while hovering over a toilet to catch such spillage.
When using a urine-diverting dry toilet, menstrual blood can be emptied into the part that receives the feces. If any menstrual blood falls into the funnel for urine, it can be rinsed away with water.
No medical research was conducted to ensure that menstrual cups were safe prior to introduction on the market. Early research in 1962 evaluated 50 women using a bell-shaped cup. The researchers obtained vaginal smears, gram stains, and basic aerobic cultures of vaginal secretions. Vaginal speculum examination was performed, and pH was measured. No significant changes were noted. This report was the first containing extensive information on the safety and acceptability of a widely used menstrual cup that included both preclinical and clinical testing and over 10 years of post-marketing surveillance.
One case report noted the development of endometriosis and adenomyosis in one menstrual cup user. Additionally, one survey with a small sample size indicated a possible link. Therefore, two organizations have issued a combined statement that urged further research. However, the U.S. Food and Drug Administration declined to remove menstrual cups from the market, saying that there was insufficient evidence of risk.
No differences in the growth of Staphylococcus aureus, or health harms were identified among school girls provided with menstrual cups compared to those using sanitary pads, or continuing their usual practice in rural western Kenya.
Toxic shock syndromeEdit
Toxic shock syndrome (TSS) is a potentially fatal bacterial illness. Scientists have recognized an association between TSS and tampon use, although the exact connection remains unclear. TSS caused by menstrual cup use appears to be very rare to virtually nonexistent. The probable reason for this is that menstrual cups are not absorbent, do not irritate the vaginal mucosal tissue, and so do not change the vaginal flora in any measurable amount. Conversely, vaginal dryness and abrasions may occur if the tampon used is more absorbent than needed for the menstrual flow, and normal liquid that should line the vaginal wall is also absorbed. Research has shown that the cup has no impact on the vaginal flora, which means there is no effect on the presence of S. aureus, the bacterium that can cause TSS. The risk of TSS associated with cervical caps used for contraception in the female barrier method is also very low. Cervical caps and menstrual cups both use mostly medical grade silicone or latex.
One case report noted a confirmed case of toxic shock syndrome (TSS) associated with the use of the DivaCup menstrual cup. The case was a woman who had a history of Hashimoto’s thyroiditis and chronic menorrhagia. This report is the first and only report to detail the association between a menstrual cup and menstrual TSS, making it very rare.
Menstrual cups are bell-shaped. Most brands use medical grade silicone as the material for the menstrual cup, although latex is also an option. Menstrual cups made from silicone are generally designed to last for 1–5 years.
The majority of menstrual cup brands on the market are selling reusable cups, rather than disposable cups, which is therefore the focus of this article.
Sizing and selectionEdit
Most menstrual cup brands sell a smaller and a larger size. The smaller size is recommended for women under 30 who have not given birth vaginally. The larger size is recommended for women who are over 30, have given birth vaginally, or have an unusually heavy flow. Cups with an even smaller size are recommended for teenagers, as well as women and girls who are more physically fit, as those with stronger pelvic floor muscles may find a larger cup uncomfortable. Length also needs to be considered: if a female's cervix sits particularly low, she may want to use a shorter cup. For example, the Meluna Shorty, FemmyCycle Low Cervix, or the LilyCup Compact. Capacity is important to women who have a heavier flow. The average menstrual cup holds around 20 ml. Some cups are designed to be larger and hold 37–42 ml. However, all cups currently available have a larger capacity than a regular tampon, which is 10–12 ml.
A final consideration in selecting a menstrual cup is firmness or flexibility. Some companies offer a range of firmness levels in their cups. A firmer cup pops open more easily after insertion and may hold a more consistent seal against the vaginal wall (preventing leaks), but many women find softer cups more comfortable.
The silicone of which most brands of cups are produced is naturally colorless and translucent. Several brands offer colored cups as well as, or instead of the colorless ones. Translucent cups lose their initial appearance faster than colored – they tend to get yellowish stains with use. The shade of a colored cup may change over time, though stains are often not as obvious on colored cups. Stains on any color of cup can often be removed or at least lightened by soaking the cup in diluted hydrogen peroxide and/or leaving it out in the sun for a few hours.
Most cups produced do not have any other additives to them, except for the colored cups. The coloring used is reported to be safe and approved by the FDA for medical use and food coloring.
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A disposable cup (also called menstrual disc) is usually disc-shaped, like a diaphragm, with a flexible outer ring and a soft, collapsible center. It is designed to be disposed of after use. These tend to be made of a medical-grade polymer blend. It is placed at the base of the cervix in the vaginal fornix, and covers the cervix, like a diaphragm. Because of its placement, it can be worn during sexual intercourse, but it is not a contraceptive nor does it protect against sexually transmitted infections.
Disposable cups are designed to fit most women, but may not be suitable for teenagers as the diameter of the rim may be uncomfortable. The disposable cup is pinched in half and inserted into the vaginal canal. Once inserted, a finger is used to push it back and down toward the cervix. The top rim of the disc rests behind the pubic bone. If correctly inserted, it should not be felt and should not leak.
After about 12 hours of use (depending on flow volume), a disposable cup should be removed and disposed of. This is done by inserting a finger into the vagina, feeling for the top of the rim, hooking the finger beneath the rim and pulling straight out. Sitting down is recommended, to keep the disc parallel to the floor while removing. Removing a disc cleanly takes practice, and may be done while seated on the toilet to avoid spillage. During peak flow, most women use two disposable cups per day.
Reusable menstrual products (including menstrual cups, but not disposable menstrual cups) are more economical than disposable products. Money will be saved using a menstrual cup, compared with other options such as tampons. A woman in a developed country spends an average of US$ 60 per year on pads and tampons. If a woman menstruates for 40 years, the lifetime expense for pads and tampons is US$ 2,400. If the average silicon menstrual cup lasts between one and five years, eight would be needed in 40 years. If a menstrual cup costs US$ 30 (costs vary by manufacturer), the lifetime cost for a menstrual cup would be approximately US$ 240.
The up-front cost of a menstrual cup may be expensive for women from low-income households, especially in developing countries. Buying pads or using rags monthly may seem more affordable than purchasing a menstrual cup, though the lifetime spend is higher.
An early version of a bell-shaped menstrual cup was patented in 1932, by the midwifery group of McGlasson and Perkins. Leona Chalmers patented the first usable commercial cup in 1937. Later menstrual cups were patented in 1935, 1937, and 1950. The Tassaway brand of menstrual cups was introduced in the 1960s, but it was not a commercial success. Early menstrual cups were made of rubber.
In 1987, another latex rubber menstrual cup, The Keeper, was manufactured in the United States. This proved to be the first commercially viable menstrual cup and it is still available today. The first silicone menstrual cup was the UK-manufactured Mooncup. Most menstrual cups are now manufactured from medical grade silicone because of its durability and hypoallergenic properties, though there are also brands made of TPE (thermoplastic elastomer). Menstrual cups are becoming more popular worldwide, with many different brands, shapes and sizes on the market. Most are reusable, though there is at least one brand of disposable menstrual cups currently manufactured.
While numerous companies all over the world offer this product it is still surprisingly little known. One reason might be that it is difficult for the companies to make much profit from this product as one single menstrual cup can last a girl or woman five years or longer. This limits the companies' advertising budget, so that most women who use menstrual cups learn of them through the internet or word of mouth. Some non-governmental organizations (NGOs) and companies have begun to propose menstrual cups to females in developing countries (for example in Kenya and South Africa) as a possible low-cost and environmentally friendly alternative to sanitary cloth, expensive disposable pads or "nothing" – the reality for many females in developing countries.
Society and cultureEdit
Menstrual cups can be useful as a means of menstrual hygiene management for women in developing countries, such as Kenya, Uganda and India, where access to affordable sanitary products may be limited. A lack of affordable hygiene products means inadequate, unhygienic alternatives are used, which can present a serious health risk. Menstrual cups offer a long-term solution compared to some other feminine hygiene products because they do not need to be replaced monthly.
Feminine hygiene products that need to be inserted into the vagina can be unacceptable for cultural reasons. There are myths that they interfere with female reproductive organs and that females lose their virginity. Use of a menstrual cup could stretch or break the hymen. Since some cultures value preservation of the hymen as evidence of virginity, this can discourage young women from using cups.
Since they are reusable, menstrual cups help to reduce solid waste. Some disposable sanitary napkins and plastic tampon applicators can take 25 years to break down in the ocean and can cause a significant environmental impact. Biodegradable sanitary options are also available, and these decompose in a short period of time, but they must be composted, and not disposed of in a landfill.
Each year, an estimated 20 billion pads and tampons are discarded in North America. They typically end up in landfills or are incinerated, which can have a great impact on the environment. Most of the pads and tampons are made of cotton and plastic. Plastic takes about 50 or more years and cotton starts degrading after 90 days if it's composted.
Given that the menstrual cup is reusable, its use greatly decreases the amount of waste generated from menstrual cycles, as there is no daily waste and the amount of discarded packaging decreases as well. After their life span is over, the silicone cups are put in landfills or incinerated.
Menstrual cups may be emptied into a small hole in the soil or in compost piles, since menstrual fluid is a valuable fertilizer for plants and any pathogens of sexually transmitted diseases will quickly be destroyed by soil microbes. The water used to rinse the cups can be disposed of in the same way. This reduces the amount of wastewater that needs to be treated.
In developing countries, solid waste management is often lacking. Here, menstrual cups have an advantage over disposable pads or tampons as they do not contribute to the solid waste issues in the communities or generate embarrassing refuse that others may see.
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