Immune system
Allergic conjunctivitis
Non-infectious · Acute or chronic
Inflammation of the clear lining of the eye caused by an allergic reaction, leading to itchy, red, watery eyes.
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Disease encyclopedia
Causes, symptoms, diagnosis, treatment approaches and prevention for common conditions. Browse A–Z, by body system, or search.
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Immune system
Immune system
Alopecia areata
Non-infectious · Acute or chronic
An autoimmune condition in which the immune system attacks hair follicles, causing round patches of hair loss.
Digestive system
Anal fissure
Non-infectious · Acute or chronic
A small tear in the lining of the anus that causes sharp pain and bleeding when passing stools.
Nervous system
Anisocoria (unequal pupils)
Non-infectious · Acute or chronic
A difference in the size of the pupils, which can be harmless or a sign of a problem with the nerves that control the eye.
Respiratory system
Aspergillosis
Infectious · Acute or chronic
A group of conditions caused by the Aspergillus mould, ranging from allergic reactions to serious lung infections in people with weak immunity.
Cardiovascular system
Atrial flutter
Non-infectious · Acute or chronic
A heart rhythm disorder in which the upper chambers beat very fast in a regular circuit, often causing a fast heartbeat.
Blood (haematology)
Autoimmune haemolytic anaemia
Non-infectious · Acute or chronic
A condition in which the immune system makes antibodies that destroy the body's own red blood cells, causing anaemia.
Nervous system
Benign paroxysmal positional vertigo
Non-infectious · Acute or chronic
Brief spells of spinning dizziness triggered by changes in head position, caused by loose crystals in the inner ear.
Cardiovascular system
Beriberi
Non-infectious · Acute or chronic
A condition caused by severe lack of vitamin B1 (thiamine), affecting the heart, nerves or brain.
Respiratory system
Blastomycosis
Infectious · Acute or chronic
A fungal infection caught by breathing in spores from soil, usually affecting the lungs and sometimes spreading to the skin and bones.
Musculoskeletal system
Bursitis
Non-infectious · Acute or chronic
Inflammation of a fluid-filled sac that cushions a joint.
Musculoskeletal system
Calcific tendinitis
Non-infectious · Acute or chronic
Calcium deposits in a tendon, usually in the shoulder, causing pain.
Cardiovascular system