A single indicator of low platelet pressure cannot determine the cause, and a combination of other indicators is needed. If the platelet count is reduced, it may be caused by aplastic anemia, advanced myelofibrosis and platelet dilution. 1. Aplastic anemia: this disease is an autoimmune disease caused by various reasons of hematopoietic failure, which is mainly manifested by the decrease of bone marrow hematopoietic ability and the increase of non-hematopoietic tissues, resulting in the sharp decrease of platelet count and low platelet pressure. 2. Advanced myelofibrosis: this disease is caused by diffuse fibroplasia of the bone marrow of unknown etiology, resulting in severe myelofibrosis, rapid decrease in the hematopoietic capacity of the bone marrow, resulting in a drastic decrease in the number of platelets and low platelet pressure. 3. Platelets are diluted: some patients have a large number of infusion, or a large number of blood transfusion, resulting in serious dilution of platelets in the blood. There is no need to worry about this situation, after the external factors return to normal, the number of platelets will also return to normal. There may be other reasons for low platelet count, when this happens, you should go to the hospital for examination to find out the specific reasons and make reasonable treatment plan.