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Medical Wikipedia
edit- Ebola virus disease
- Echovirus
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- Ectopia lentis
- Ectopic pregnancy
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- Epidermolysis bullosa
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- Erysipelas
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- Pathogenic Escherichia coli
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- Esthesioneuroblastoma
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- Evans syndrome
- Ewing's sarcoma
- Exencephaly
- Erythroderma
- Serpentine fibula-polycystic kidney syndrome
- Exophoria
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- Hereditary multiple exostoses
- Exostosis
- Exotropia
- Experimental autoimmune encephalomyelitis
- Exploding head syndrome
- Bladder exstrophy
- Movement disorder
- FACES syndrome
- Facial cleft
- Seaver Cassidy syndrome
- Facial nerve paralysis
- Facioscapulohumeral muscular dystrophy
- Factor V
- Factor V Leiden
- Factor VII
- Factor X
- Factor XI
- Factor XIII
- Factor XIII deficiency
- Multiple epiphyseal dysplasia
- Tetralogy of Fallot
- Transthyretin-related hereditary amyloidosis
- Familial aortic dissection
- Cold urticaria
- Colorectal cancer
- Familial dysautonomia
- Lipoprotein lipase deficiency
- Hyperlipidemia
- Familial hypertriglyceridemia
- Hypopituitarism
- Familial Mediterranean fever
- Periodic paralysis
- Treacher Collins syndrome
- Catecholaminergic polymorphic ventricular tachycardia
- Fan death
- Fanconi anemia
- Fanconi syndrome
- Farmer's lung
- Fatal familial insomnia
- Fatty liver
- Fazio–Londe disease
- Febrile seizure
- Fechtner syndrome
- Feingold syndrome
- Felty's syndrome
- Intersex
- Female sexual arousal disorder
- Femur fibula ulna syndrome
- Congenital cytomegalovirus infection
- Fetal hydantoin syndrome
- Methylmercury
- Hydrops fetalis
- Thalidomide
- Fetal warfarin syndrome
- FG syndrome
- Fibrochondrogenesis
- Hamartoma
- Fibroma
- Fibromatosis
- Fibromuscular dysplasia
- Fibromyalgia
- Fibrosarcoma
- Idiopathic pulmonary fibrosis
- Mediastinitis
- Fibrosis
- Fibrous dysplasia of bone
- Fibrodysplasia ossificans progressiva
- Fifth disease
- Filariasis
- Lattice corneal dystrophy
- Fish-eye disease
- Fissured tongue
- Fitz-Hugh–Curtis syndrome
- Fitzsimmons–Guilbert syndrome
- Pseudomonas oryzihabitans
- Necrotizing fasciitis
- Floater
- Floating-Harbor syndrome
- Endosalpingiosis
- Fluorosis
- Flynn–Aird syndrome
- Focal dermal hypoplasia
- Focal dystonia
- Focal facial dermal dysplasia
- Foix–Chavany–Marie syndrome
- Foix–Alajouanine syndrome
- Follicular lymphoma
- Glycogen storage disease type III
- Foreign accent syndrome
- Formaldehyde
- Fountain syndrome
- Fournier gangrene
- Fox–Fordyce disease
- Fragile X syndrome
- Franceschetti–Klein syndrome
- Hallermann–Streiff syndrome
- Fraser syndrome
- Frasier syndrome
- Infantile free sialic acid storage disease
- Freeman–Sheldon syndrome
- Freiberg disease
- Frey's syndrome
- Friedreich's ataxia
- Adiposogenital dystrophy
- Frontonasal dysplasia
- Hereditary fructose intolerance
- Fructose 1,6-bisphosphatase
- Essential fructosuria
- Fucosidosis
- Fukuyama congenital muscular dystrophy
- Fumarase deficiency
- Neuroendocrine tumor
- Myiasis
- Tooth fusion
- List of diseases (G)
- Galactorrhea
- Galactocele
- Galactokinase deficiency
- Galactorrhea hyperprolactinemia
- Morquio syndrome
- Galactose-1-phosphate uridylyltransferase deficiency
- Galactosemia
- Galloway Mowat syndrome
- Hyperkalemic periodic paralysis
- Ganglioglioma
- Gangliosidosis
- GM2 gangliosidoses
- GM1 gangliosidoses
- Ganser syndrome
- GAPO syndrome
- Painful bruising syndrome
- Nissen fundoplication
- Gastric dumping syndrome
- Gastric lymphoma
- Gastrocutaneous syndrome
- Gastrointestinal cancer
- Gaucher's disease
- Narcolepsy
- Weill–Marchesani syndrome
- Gender identity disorder
- Miller syndrome
- Generalized anxiety disorder
- Thyroid hormone resistance
- Generalised epilepsy
- Koro (medicine)
- Genu varum
- Genuphobia
- Geographic tongue
- Fetal trimethadione syndrome
- Gerodermia osteodysplastica
- Gerstmann syndrome
- Gestational diabetes
- Gestational pemphigoid
- Gestational trophoblastic disease
- Gianotti–Crosti syndrome
- Giant axonal neuropathy
- Giant-cell arteritis
- Idiopathic giant-cell myocarditis
- Congenital melanocytic nevus
- Giant platelet disorder
- Giardiasis
- Gigantism
- Gilbert's syndrome
- Tourette syndrome
- Gingivitis
- Gitelman syndrome
- Glanzmann's thrombasthenia
- Glaucoma
- Glioblastoma multiforme
- Glioma
- Gliomatosis cerebri
- Gliosarcoma
- Glomerulonephritis
- Glomerulosclerosis
- Glossophobia
- Glucagonoma
- Glucose-6-phosphate dehydrogenase deficiency
- Glucose-galactose malabsorption
- Glutaric aciduria type 1
- Glutathione synthetase deficiency
- Glycogen storage disease
- Glycogen storage disease type I
- Glycogen storage disease type VI
- Phosphofructokinase deficiency
- Glycogen storage disease type V
- Glycogen storage disease type IV
- Glycogen storage disease type 0
- Glycosuria
- GMS syndrome
- Goitre
- Goldenhar syndrome
- Gonadal dysgenesis
- Mixed gonadal dysgenesis
- XY gonadal dysgenesis
- Neisseria gonorrhoeae
- Goodpasture syndrome
- Gorham's disease
- Acrogeria
- Gougerot–Blum syndrome
- Graft-versus-host disease
- Granulocyte
- Granuloma annulare
- Lymphomatoid granulomatosis
- Graves' disease
- Gray platelet syndrome
- Hydrops-ectopic calcification-moth-eaten skeletal dysplasia
- Transient acantholytic dermatosis
- Growth hormone deficiency
- Guanidinoacetate methyltransferase deficiency
- Gymnophobia
- Gynecomastia
- Factor XII
- Hagemoser–Weinstein–Bresnick syndrome
- Hailey–Hailey disease
- Hairy cell leukemia
- Hairy palms and soles
- Black hairy tongue
- Hajdu–Cheney syndrome
- Halal syndrome
- Pantothenate kinase-associated neurodegeneration
- Hallucinogen persisting perception disorder
- Bunion
- Nevus sebaceous
- HOXA13
- Rett syndrome
- Hand, foot and mouth disease
- Hand–Schüller–Christian disease
- Tyrosinemia type II
- Harding ataxia
- Harlequin-type ichthyosis
- Harpaxophobia
- Hartnup disease
- Hashimoto's thyroiditis
- Congenital self-healing reticulohistiocytosis
- Hay–Wells syndrome
- Aneurysm of heart
- Myocardial infarction
- Heart block
- Dextrocardia
- Primary tumors of the heart
- Heavy metal (chemistry)
- HEC syndrome
- Heliophobia
- HELLP syndrome
- Helminthiasis
- Hemangioblastoma
- Hemangioendothelioma
- Kasabach–Merritt syndrome
- Hemangioma
- Hemangiopericytoma
- Hemifacial microsomia
- Megalencephaly
- Hemiplegia
- Familial hemiplegic migraine
- Iron overload
- HFE hereditary haemochromatosis
- Juvenile hemochromatosis
- Haemochromatosis type 3
- Ferroportin
- Hemoglobin C
- Hemoglobin E
- Hemoglobinopathy
- Hemoglobinuria
- Hemolytic-uremic syndrome
- Hemophagocytic lymphohistiocytosis
- Blood phobia
- Hantavirus hemorrhagic fever with renal syndrome
- Hemorrhoid
- Bernard–Soulier syndrome
- Hemosiderosis
- Hemothorax
- Hennekam syndrome
- Hepadnaviridae
- Heparin-induced thrombocytopenia
- Hepatic encephalopathy
- Hepatic veno-occlusive disease
- Hepatoblastoma
- Hepatocellular carcinoma
- Hepatorenal syndrome
- Type I tyrosinemia
- Herpes simplex
- Hereditary angioedema
- Hereditary coproporphyria
- Hereditary elliptocytosis
- Hereditary hemorrhagic telangiectasia
- Hyperuricemia
- Methemoglobinemia
- Hereditary pancreatitis
- Hereditary spastic paraplegia
- Hermansky–Pudlak syndrome
- Hermaphrodite
- Herpangina
- Herpesviral encephalitis
- Herpesviridae
- Neonatal herpes simplex
- Ramsay Hunt syndrome type II
- Herpes zoster
- Herpes B virus
- Herpes of the eye
- Herpetophobia
- Homophobia
- Situs ambiguus
- TNF receptor associated periodic syndrome
- Sprengel's deformity
- Dislocation of hip
- Hip dysplasia (canine)
- Hip dysplasia (human)
- Junctional ectopic tachycardia
- Orthomolecular medicine
- Histidinemia
- Langerhans cell histiocytosis
- Non-Langerhans cell histiocytosis
- Histoplasmosis
- Histrionic personality disorder
- HIV
- Hypermobility
- Hodgkin's lymphoma
- Smith–Fineman–Myers syndrome
- Holocarboxylase synthetase deficiency
- Holoprosencephaly
- Holt–Oram syndrome
- Homocystinuria
- Horner's syndrome
- Horseshoe kidney
- Hot tub folliculitis
- Howel–Evans syndrome
- Ehrlichiosis ewingii infection
- Human granulocytic anaplasmosis
- Human monocytotropic ehrlichiosis
- Parvovirus B19
- Hunter syndrome
- Huntington's disease
- Hurler syndrome
- Progeria
- Hutchinson's teeth
- Phenytoin
- Molar pregnancy
- Echinococcosis
- Hydranencephaly
- Hydrocephalus
- Hydrolethalus syndrome
- Hydronephrosis
- Rabies
- Primary hyperoxaluria
- Hymenolepiasis
- Hyperimmunoglobulin E syndrome
- Hyper IgM syndrome
- Hyperaldosteronism
- Hyperammonemia
- Hyperandrogenism
- Bilirubin
- Hypercalcaemia
- Hypercalciuria
- Hypercementosis
- Hypercholesterolemia
- Hyperekplexia
- Hypergeusia
- Hyperglycemia
- Hyperglycerolemia
- Hyperglycinemia
- Hyperhidrosis
- Hyperhomocysteinemia
- Hyper-IgD syndrome
- Congenital hyperinsulinism
- Hyperkalemia
- Hyperkeratosis
- Hyperlysinemia
- Hyperopia
- Worth syndrome
- Hyperostosis frontalis interna
- Hyperoxaluria
- Hyperparathyroidism
- Hyperphenylalaninemia
- Pipecolic acidemia
- Hyperprolinemia
- Hyperreflexia
- Hypersensitivity
- Type I hypersensitivity
- Type II hypersensitivity
- Type III hypersensitivity
- Type IV hypersensitivity
- Hypersomnia
- Hypertensive retinopathy
- Hyperthermia
- Hyperthyroidism
- Hypertriglyceridemia
- Hypertropia
- Hypertryptophanemia
- Hypervitaminosis A
- Hypervitaminosis D
- Hypervitaminosis E
- Hypoactive sexual desire disorder
- Hypoaldosteronism
- Hypobetalipoproteinemia
- Hypocalcaemia
- Hypochondriasis
- Hypochondrogenesis
- Hypochondroplasia
- Urticarial vasculitis
- Hypodermyasis
- Hypodontia
- Hypoglycemia
- Hypohidrotic ectodermal dysplasia
- Hypokalemia
- Hypokalemic periodic paralysis
- Hypokalemic sensory overstimulation
- Hypolipoproteinemia
- Prader–Willi syndrome
- Hypoparathyroidism
- Hypophosphatasia
- X-linked hypophosphatemia
- Hypoplastic left heart syndrome
- Michels Caskey syndrome
- Hypoprothrombinemia
- Hypospadias
- Pallister–Hall syndrome
- Tuber cinereum hamartoma
- Hypothermia
- Hypothyroidism
- Hypotrichosis
- Hypoxia (medical)
- I-cell disease
- Trichothiodystrophy
- Immunodeficiency–centromeric instability–facial anomalies syndrome
- Ichthyoallyeinotoxism
- Fear of fish
- Ichthyosis bullosa of Siemens
- Ruzicka Goerz Anton syndrome
- Ichthyosis follicularis with alopecia and photophobia syndrome
- Ichthyosis linearis circumflexa
- Netherton syndrome
- Scoliosis
- Juvenile osteoporosis
- Idiopathic pulmonary haemosiderosis
- Idiopathic sclerosing mesenteritis
- Idiopathic thrombocytopenic purpura
- Selective immunoglobulin A deficiency
- Iminoglycinuria
- Impetigo
- Impossible syndrome
- Inborn error of metabolism
- Inborn errors of renal tubular transport
- Urea cycle disorder
- Incontinentia pigmenti
- Incontinentia pigmenti achromians
- Indometacin
- Folie à deux
- Infant respiratory distress syndrome
- Infantile digital fibromatosis
- Epileptic spasms
- Spinal muscular atrophies
- Septic arthritis
- Myocarditis
- Inflammatory breast cancer
- Influenza
- Inguinal hernia
- Intoxicative inhalant
- Insulinoma
- Intraocular lymphoma
- Interstitial cystitis
- Whipple's disease
- Intestinal pseudoobstruction
- Intestinal spirochetosis
- Pigeon toe
- Cerebral arteriovenous malformation
- Vertically transmitted infection
- Iodine
- Iodine deficiency
- Toxiphobia
- Uveitis
- Iridogoniodysgenesis, dominant type
- Iron deficiency
- Irritable bowel syndrome
- Neuromyotonia
- Isosporiasis
- Asplenia with cardiovascular anomalies
- Jackson–Weiss syndrome
- Jacobsen syndrome
- Pachyonychia congenita
- Jalili syndrome
- Spinal muscular atrophy with progressive myoclonic epilepsy
- Jansky–Bielschowsky disease
- Japanese encephalitis
- Spondylocostal dysostosis
- Jervell and Lange-Nielsen syndrome
- Asphyxiating thoracic dysplasia
- Johanson–Blizzard syndrome
- Johnson–Munson syndrome
- Joubert syndrome
- Jumping Frenchmen of Maine
- Juvenile dermatomyositis
- Lesch–Nyhan syndrome
- Juvenile hyaline fibromatosis
- Juvenile myoclonic epilepsy
- Kabuki syndrome
- Kallmann syndrome
- Kaposi's sarcoma
- Kapur–Toriello syndrome
- Primary ciliary dyskinesia
- Katz syndrome
- Kaufman oculocerebrofacial syndrome
- Kawasaki disease
- Kearns–Sayre syndrome
- Keloid
- Spinal and bulbar muscular atrophy
- Keratoacanthoma
- Keratoconjunctivitis sicca
- Keratoconus
- Keratomalacia
- Keratosis follicularis spinulosa decalvans
- Keratosis pilaris
- Seborrheic keratosis
- Kerion
- Kernicterus
- Keutel syndrome
- Anaplastic large-cell lymphoma
- Keratitis–ichthyosis–deafness syndrome
- Kikuchi disease
- Kimura's disease
- Malignant hyperthermia
- Kjer's optic neuropathy
- Kleine–Levin syndrome
- Klippel–Trénaunay syndrome
- Klumpke paralysis
- Klüver–Bucy syndrome
- Kniest dysplasia
- Familial partial lipodystrophy
- Kocher–Debre–Semelaigne syndrome
- Köhler disease
- Kohlschütter-Tönz syndrome
- Koilonychia
- Korsakoff's syndrome
- Kostmann syndrome
- Kowarski syndrome
- Krabbe disease
- Peters-plus syndrome
- Kuru (disease)
- Kwashiorkor
- Kyasanur forest disease
- Kyphosis
- Labyrinthitis
- Lachiewicz–Sibley syndrome
- Lafora disease
- Lambert–Eaton myasthenic syndrome
- Lamellar ichthyosis
- John Langdon Down
- Langer–Giedion syndrome
- Gastroschisis
- Diffuse large B-cell lymphoma
- Laron syndrome
- Laryngeal cancer
- Laryngeal cleft
- Laryngeal papillomatosis
- Laryngocele
- Laryngomalacia
- Lassa fever
- Raoul Bensaude
- Long-chain 3-hydroxyacyl-coenzyme A dehydrogenase deficiency
- Lead poisoning
- Leber's hereditary optic neuropathy
- Lecithin cholesterol acyltransferase deficiency
- Plantar fibromatosis
- Left ventricular hypertrophy
- Legg–Calvé–Perthes syndrome
- Legionnaires' disease
- Leigh's disease
- Leiner's disease
- Leiomyoma
- Leiomyosarcoma
- Leishmaniasis
- Lemierre's syndrome
- Lennox–Gastaut syndrome
- Lenz microphthalmia syndrome
- Donohue syndrome
- Leprosy
- Leptospirosis
- Leri pleonosteosis
- Léri–Weill dyschondrosteosis
- Lethal congenital contracture syndrome
- Letterer–Siwe disease
- Maple syrup urine disease
- Myeloid leukemia
- T-cell prolymphocytic leukemia
- Leukemia
- Leukocyte adhesion deficiency
- Leukodystrophy
- Periventricular leukomalacia
- Leukoplakia
- Levator ani
- Neuroacanthocytosis
- Leaky gut syndrome
- Lhermitte–Duclos disease
- Lichen myxedematosus
- Lichen planus
- Lichen sclerosus
- Lichen spinulosus
- Liddle's syndrome
- Li–Fraumeni syndrome
- Light chain deposition disease
- Phonophobia
- Limb-girdle muscular dystrophy
- Urbach–Wiethe disease
- Liposarcoma
- Listeriosis
- Livedoid dermatitis
- Locked-in syndrome
- Loa loa filariasis
- Loin pain hematuria syndrome
- Long QT syndrome
- Loose anagen syndrome
- Oculocerebrorenal syndrome
- Lowry–MacLean syndrome
- Levo-Transposition of the great arteries
- Lucey–Driscoll syndrome
- Problem gambling
- Lujan–Fryns syndrome
- Lumbar spinal stenosis
- Lung cancer
- Lupus anticoagulant
- Toxic epidermal necrolysis
- Nyctophobia
- Lymphangiectasia
- Lymphangioleiomyomatosis
- Lymphatic filariasis
- Lymphedema–distichiasis syndrome
- Milroy's disease
- Congenital lymphedema
- Lymphedema
- Lymphoblastic lymphoma
- Lymphocytic colitis
- Cutaneous lymphoid hyperplasia
- AIDS-related lymphoma
- Small cleaved cells
- Lymphomatoid papulosis
- Lyngstadaas syndrome
- Lysosomal storage disease
- Macroglobulinemia
- Macroglossia
- Beckwith–Wiedemann syndrome
- Macrophagic myofasciitis
- May–Hegglin anomaly
- Macular corneal dystrophy
- Vitelliform macular dystrophy
- Bovine spongiform encephalopathy
- Benign symmetric lipomatosis
- Maffucci syndrome
- Mal de debarquement
- Malaria
- Pleomorphic undifferentiated sarcoma
- Mallory–Weiss syndrome
- Malonyl-CoA decarboxylase deficiency
- Malouf syndrome
- Malpuech facial clefting syndrome
- Mandibuloacral dysplasia
- Mannosidosis
- Mansonelliasis
- Mantle cell lymphoma
- Marburg virus disease
- Marchiafava–Bignami disease
- Marcus Gunn phenomenon
- Marden–Walker syndrome
- Marek's disease
- Marfan syndrome
- Loeys–Dietz syndrome
- Marfanoid
- Marinesco–Sjögren syndrome
- Maroteaux–Lamy syndrome
- Marshall–Smith syndrome
- MASA syndrome
- Mass psychogenic illness
- Mastocytosis
- Mastoiditis
- Hypermethioninemia
- Diabetes mellitus and deafness
- Maturity onset diabetes of the young
- Binder's syndrome
- Müllerian agenesis
- McGillivray syndrome
- McKusick–Kaufman syndrome
- Meadow's syndrome
- Measles
- Medullary cystic kidney disease
- Medullary thyroid cancer
- Medulloblastoma
- Megaduodenum
- Otospondylomegaepiphyseal dysplasia
- Megaloblastic anemia
- Meige's syndrome
- MELAS syndrome
- Meleda disease
- Melioidosis
- Melkersson–Rosenthal syndrome
- Melnick–Needles syndrome
- Ménétrier's disease
- Ménière's disease
- Meningioma
- Meningococcal disease
- Spina bifida
- Intellectual disability
- Mercury poisoning
- Ardalan–Shoja–Kiuru syndrome
- Mesenteric ischemia
- Mesothelioma
- Metabolic acidosis
- Metabolic syndrome
- Metachondromatosis
- Metageria
- Methylmalonic acidemia
- Methylmalonyl-CoA mutase deficiency
- Mevalonate kinase deficiency
- Relapsing polychondritis
- Michelin tire baby syndrome
- Michels syndrome
- Mickleson syndrome
- Micro syndrome
- Microcephaly lymphoedema chorioretinal dysplasia
- Microcoria
- Macular hypoplasia
- Microphthalmia
- Microscopic polyangiitis
- Microsporidiosis
- Microtia
- Sjögren's syndrome
- Microphthalmia–dermal aplasia–sclerocornea syndrome
- Benign lymphoepithelial lesion
- Mild cognitive impairment
- Miller–Dieker syndrome
- Minamata disease
- Mirhosseini–Holmes–Walton syndrome
- Mitochondrial disease
- Mitochondrial trifunctional protein deficiency
- Mitral valve prolapse
- Mixed connective tissue disease
- Mixed Müllerian tumor
- Mixed receptive-expressive language disorder
- MN1 (gene)
- Orofaciodigital syndrome 1
- Mohr–Tranebjærg syndrome
- Molluscum contagiosum
- Molybdenum cofactor deficiency
- MOMO syndrome
- Mondini dysplasia
- Mondor's disease
- Monilethrix
- Brunner syndrome
- Monoclonal gammopathy of undetermined significance
- Morel's ear
- Morgellons
- Motor neuron disease
- Tracheobronchomegaly
- Moyamoya disease
- Myeloperoxidase deficiency
- Sanfilippo syndrome
- Pityriasis lichenoides et varioliformis acuta
- Muckle–Wells syndrome
- Hereditary mucoepithelial dysplasia
- Sialidosis
- Pseudo-Hurler polydystrophy
- Mucolipidosis type IV
- Mucopolysaccharidosis
- Sly syndrome
- Mucormycosis
- Multiple sulfatase deficiency
- Muenke syndrome
- Mulibrey nanism
- Multicentric reticulohistiocytosis
- Multifocal motor neuropathy
- Premature ventricular contraction
- Multiple chemical sensitivity
- Multiple endocrine neoplasia type 1
- Multiple endocrine neoplasia type 2
- Multiple myeloma
- Multiple organ dysfunction syndrome
- Multiple sclerosis
- Multiple system atrophy
- Münchausen syndrome
- Münchausen syndrome by proxy
- Myasthenia gravis
- Mycetoma
- Mycobacterium avium-intracellulare infection
- Atypical pneumonia
- Mycosis fungoides
- Polyneuropathy
- Myelitis
- Myelodysplastic syndrome
- Myelofibrosis
- Myhre syndrome
- Myoclonic dystonia
- Myoclonic epilepsy
- MERRF syndrome
- Unverricht–Lundborg disease
- Myoclonus
- Myoglobinuria
- Myopathy, X-linked, with excessive autophagy
- Myopathy
- Myopia
- Myositis ossificans
- Inclusion body myositis
- Myositis
- Myxedema
- Myxoid liposarcoma
- Myxozoa
- N-Acetylglutamate synthase deficiency
- Naegeli–Franceschetti–Jadassohn syndrome
- Nail–patella syndrome
- Nakajo syndrome
- Nance–Horan syndrome
- Narcissistic personality disorder
- Nasodigitoacoustic syndrome
- Nasopharynx cancer
- Naxos syndrome
- Neisseria meningitidis
- Nelson's syndrome
- Nemaline myopathy
- Neonatal diabetes mellitus
- Permanent neonatal diabetes mellitus
- Transient neonatal diabetes mellitus
- Neonatal hemochromatosis
- Neonatal hepatitis
- Neonatal jaundice
- Necrophilia
- Large for gestational age
- Wilms' tumor
- Nephrocalcinosis
- Kidney stone
- Nephronophthisis
- Nephropathy
- Hypertensive nephropathy
- Nephrotic syndrome
- Nerve sheath tumor
- Nesidioblastosis
- Neurulation
- Neural tube defect
- Galactosialidosis
- Neurasthenia
- Infantile neuroaxonal dystrophy
- Neuroblastoma
- Neurocutaneous melanosis
- Cysticercosis
- Neurofibrillary tangle
- Neurofibroma
- Neurofibromatosis
- Neurofibromatosis type 3
- Neurofibromatosis type 4
- Watson syndrome
- Malignant peripheral nerve sheath tumor
- Neuroleptic malignant syndrome
- Neurosyphilis
- Neurotoxicity
- Nevoid basal cell carcinoma syndrome
- Nezelof syndrome
- Nicolaides–Baraitser syndrome
- Nicotine withdrawal
- Niemann–Pick disease
- Niemann–Pick disease, type C
- Nyctalopia
- X-linked congenital stationary night blindness
- Olney's lesions
- Nocardiosis
- Noise-induced hearing loss
- Noma (disease)
- Non-24-hour sleep–wake disorder
- Non-Hodgkin lymphoma
- Glycine encephalopathy
- Non-small-cell lung carcinoma
- Nonverbal learning disorder
- Noonan syndrome
- Norman–Roberts syndrome
- Norrie disease
- Northern epilepsy syndrome
- Notalgia paresthetica
- Tree nut allergy
- Nystagmus
- Zonular cataract and nystagmus
- Obesophobia
- Obsessive–compulsive disorder
- Obsessive–compulsive personality disorder
- Obstructive sleep apnea
- Occipital horn syndrome
- Occupational asthma
- Urofacial syndrome
- Ochronosis
- Pogosta disease
- Ocular albinism
- Presumed ocular histoplasmosis syndrome
- Uveal melanoma
- Eye movement
- Toxoplasmic chorioretinitis
- Oculodentodigital dysplasia
- Oculocutaneous albinism type I
- Oculomotor nerve palsy
- Oculopharyngeal muscular dystrophy
- Odontoma
- Ogilvie syndrome
- Oikophobia
- Osmophobia
- Oligodactyly
- Oliver–McFarlane syndrome
- Olivopontocerebellar atrophy
- Ollier disease
- Palmoplantar keratoderma
- Ombrophobia
- Omenn syndrome
- Omsk hemorrhagic fever
- Onchocerciasis
- Oncocytoma
- Oneirophobia
- Ingrown nail
- Onychogryphosis
- Onycholysis
- Onychomadesis
- Onychomatricoma
- Onychomycosis
- Onychophosis
- Opioid dependence
- Opioid-induced hyperalgesia
- Scopophobia
- Trigonocephaly
- Opportunistic infection
- Oppositional defiant disorder
- Opsismodysplasia
- Optic disc drusen
- Optic nerve hypoplasia
- Optic neuritis
- Sugarman syndrome
- Oral submucous fibrosis
- Organic brain syndrome
- Organophosphate poisoning
- Ornithine aminotransferase deficiency
- Psittacosis
- Orotic aciduria
- Orthostatic intolerance
- Osgood–Schlatter disease
- OSLAM syndrome
- Paget's disease of bone
- Bone
- Osteoarthritis
- Osteochondritis dissecans
- Osteochondritis
- Osteochondroma
- Osteosarcoma
- Osteomyelitis
- Avascular necrosis
- Osteopetrosis
- Osteopoikilosis
- Osteoporosis
- Otodental syndrome
- Otosclerosis
- Ovarian cancer
- Overwhelming post-splenectomy infection