Henoch-Schönlein purpura medical definition

A form of nonthrombocytopenic purpura occurring most commonly in boys and associated with pain or swelling of the joints, colic, vomiting of blood, passage of bloody stools, and sometimes inflammation of the kidneys. Also called allergic purpura, anaphylactoid purpura, Schönlein's disease, Schönlein-Henoch purpura.