Platelet 90×10^9/L, normally it does not matter, but if it is caused by malignant blood diseases, it is very serious. 1. Platelets mainly play the role of hemostasis, the normal value range is (100~300)×10^9/L. If the value is between (80~90)×10^9/L, it belongs to mild reduction, most of them do not have spontaneous hemorrhage, and no treatment is needed for the time being, but it is necessary to recheck the value of platelets, and the cause of thrombocytopenia should be clarified at the same time. 2. If thrombocytopenia is caused by other diseases, the primary disease should be treated and the severity should be judged according to the primary disease, such as thrombocytopenia caused by acute leukemia, which is very serious and should be treated with drugs such as cytarabine and other chemotherapy in time. There are many other causes of thrombocytopenia, such as nutritional reduction, tea, red wine, vegetarian diet or the adverse effects of taking some drugs, etc. It is recommended that the cause of the disease should be found in a timely manner, and attention should be paid to a healthy diet, appropriate exercise, and treatment under the guidance of a physician.