1.This is a reduction in platelet number below 150,000/micro liter

2.Thrombocytopenia may be due to bone marrow dysfunction from radiation and chemotherapy.

3.Thrombocytopenia may be due to increase pooling of platelets in the spleen

4.Thrombocytopenia may be due to antibodies against platelets that facilitate destruction. These antibodies attack the glycoprotein 11b/111a receptors on the surface of the platelets.

5.Thrombocytopenia may be due to some drugs like aspirin and atorvastatin.

6.Thrombocytopenia may be due to heparin.