•Thrombocytopenia may be due to:

•1. drugs such as aspirin,and atorvastatin,

•2. heparin . Ten percent of people treated with heparin develop a mild, transient thrombocytopenia within 2 to 5 days of starting the drug.

•3. Thrombotic Thrombocytopenic Purpura.

•4. immune thrombocytopenic purpura.-Primary ITP is an autoimmune disease in which platelets are directly destroyed or their formation inhibited by the immune system.