Henoch-Schonlein purpura

Alternative names:

anaphylactoid purpura; vascular purpura

Definition:

A group of conditions including purpura (purple spots on the skin), joint pain, gastrointestinal symptoms, and glomerulonephritis (a type of kidney disorder).

Causes, incidence, and risk factors:

Henoch-Schonlein is a type of hypersensitivity vasculitis and inflammatory response within the blood vessel. It is caused by an abnormal response of the immune system. The exact cause for this disorder is unknown but the incidence in boys is greater than girls. The syndrome is usually seen in children, but people of any age may be affected. The symptoms usually resolve within 1 week, but they may recur several times before complete remission.