The diagnostic criteria for thrombocytopenia is peripheral platelets less than 100×10^9/L. The diagnostic criterion of thrombocytopenia is that the platelet value in blood routine is lower than the normal value range. Generally, the normal value of normal platelets is in the range of (100~300)×10^9/L, and platelets less than 100×10^9/L can be diagnosed as thrombocytopenia. Due to different degrees of thrombocytopenia, the accompanying symptoms are not the same, generally platelets below 100 × 10^9/L, greater than 50 × 10^9/L may not have spontaneous bleeding symptoms, if the platelet count between (20 to 50) × 10^9/L, the risk of bleeding is relatively high. If platelets <20×10^9/L there are often skin and mucous membrane petechiae, purpura, ecchymosis, nosebleeds, blood blisters in the mouth, black stools, and excessive menstruation. If physical examination reveals thrombocytopenia or the body often has skin petechiae, ecchymosis, nosebleeds or menorrhagia, etc., you should go to a regular hospital in a timely manner, so that the doctor can determine whether there is thrombocytopenia according to the examination in order to give timely treatment.