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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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.
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.