Musculoskeletal system
Baker's cyst
Non-infectious · Chronic
A fluid-filled swelling behind the knee, usually linked to arthritis or a cartilage tear inside the knee joint.
GeoMed · Disease encyclopedia
Disease encyclopedia
Causes, symptoms, diagnosis, treatment approaches and prevention for common conditions. Browse A–Z, by body system, or search.
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Disease encyclopedia
Musculoskeletal system
Digestive system
Barrett's oesophagus
Non-infectious · Chronic
A change in the lining of the lower food pipe caused by long-term acid reflux, which slightly increases the risk of oesophageal cancer.
Skin (integumentary system)
Basal cell carcinoma
Non-infectious · Chronic
The most common type of skin cancer, which grows slowly on sun-exposed skin and rarely spreads.
Immune system
Behçet's disease
Non-infectious · Chronic
A rare, long-term inflammatory condition causing blood vessel inflammation, with mouth and genital ulcers, eye inflammation and skin problems.
Nervous system
Benign essential blepharospasm
Non-infectious · Chronic
A neurological condition causing involuntary, repeated blinking and forceful closing of the eyelids.
Urinary system
Benign prostatic hyperplasia
Non-infectious · Chronic
Non-cancerous enlargement of the prostate gland in older men, which can cause problems passing urine.
Cardiovascular system
Bicuspid aortic valve
Non-infectious · Chronic
A heart valve present from birth with two leaflets instead of three, which can become narrowed or leaky and is linked to aortic enlargement.
Digestive system
Bile acid diarrhoea
Non-infectious · Chronic
Chronic watery diarrhoea caused by too much bile acid reaching the large bowel.
Digestive system
Bile duct cancer (cholangiocarcinoma)
Non-infectious · Chronic
A rare cancer of the bile ducts, the tubes that carry bile from the liver to the bowel, often found late.
Digestive system
Biliary atresia
Non-infectious · Chronic
A rare condition in newborns in which the bile ducts are blocked or missing, causing jaundice and liver damage.
Mental health
Binge eating disorder
Non-infectious · Chronic
An eating disorder involving regular episodes of eating large amounts of food while feeling out of control, followed by distress.
Mental health
Bipolar disorder
Non-infectious · Chronic
A long-term mental health condition causing episodes of depression and episodes of mania or hypomania.
Urinary system
Bladder cancer
Non-infectious · Chronic
Cancer that starts in the lining of the bladder, most often causing painless blood in the urine, and strongly linked to smoking.
Eyes and vision
Blepharitis
Non-infectious · Chronic
Long-term inflammation of the eyelid margins, causing red, itchy, crusty eyelids and gritty eyes.
Mental health
Body dysmorphic disorder
Non-infectious · Chronic
A mental health condition in which a person spends a lot of time worrying about perceived flaws in their appearance that others cannot see or consider minor.