Thrombocytopenia

Thrombocytopenia (pronounced: throm-buh-syte-uh-pee-nee-uh), or a lower than normal number of platelets, is usually diagnosed because a person has abnormal bruising or bleeding. Thrombocytopenia can happen when a person takes certain drugs or develops infections or leukemia or when the body uses up too many platelets. Idiopathic thrombocytopenic purpura (ITP) is a condition, which can occur in children, in which the person's immune system attacks and destroys his or her own platelets.

Article from KidsHealth.org