The incidence of<unk>  is about 4–5 cases per million people per year. Idiopathic<unk>  occurs more often in women and people of African descent, and<unk>  secondary to autoimmune disorders such as systemic lupus erythematosus occurs more frequently in people of African descent, although other secondary forms do not show this distribution. Pregnant women and women in the post partum period accounted for a notable portion (12–31%) of the cases in some studies;<unk>  affects about one in 25,000 pregnancies.
Thrombotic thrombocytopenic purpura
Atypical hemolytic uremic syndrome
Drug-induced thrombocytopenic purpura
Hemolytic–uremic syndrome
Immune thrombocytopenic purpura
Disseminated intravascular coagulation
Heparin-induced thrombocytopenia
Gray platelet syndrome