Platelets of (40~50)×10^9/L are usually classified as thrombocytopenia, which can usually be recovered through etiologic treatment. The normal value of platelets is (100~300)×10^9/L. When platelets are less than 100×10^9/L, it belongs to thrombocytopenia. 1. The cause may be insufficient platelet production, such as aplastic anemia, acute leukemia, and acute infection. It may also be due to excessive platelet destruction, such as excessive platelet destruction and reduction in the number of platelets by drugs such as sulfonamide and chloramphenicol. In addition, it can also be seen in primary immune thrombocytopenia, disseminated intravascular coagulation, systemic lupus erythematosus and other diseases. 2. For patients with insufficient platelet production, platelet-raising capsules and recombinant human thrombopoietin can be taken to promote platelet production and increase the number of platelets. For patients with excessive platelet destruction, adrenocorticotropic hormone drugs such as prednisone acetate can be taken to inhibit the production of platelet-related antibodies and reduce the destruction of platelets. It is recommended that the patient, with the help of the doctor, first clarify the cause of the disease, and then follow the doctor’s instructions to take the appropriate medication to improve the platelet level.