Idiopathic thrombocytopenic purpura is an immune disorder in which the blood does not clot normally. This condition is now commonly known as immune thrombocytopenia (ITP).

Immune thrombocytopenic purpura is an autoimmune disease that occurs when some cells of the immune system produce antibodies against platelets. When the body is invaded by a virus..., white blood cells will create antibodies to fight against foreign objects; causing platelets to be destroyed, making the patient's body prone to bleeding even with the slightest impact.