Platelet 12×10⁹/L treatment varies depending on the condition, and often includes bed rest, medication, platelet supplementation, and cause-specific treatment. 1. bed rest: platelets 12×10⁹/L first need bed rest, minimize activity, because the risk of bleeding may occur with high activity. 2. Medication and platelet supplementation: if there is bleeding tendency, it can be treated with hemostatic drugs such as aminoglycolic acid under doctor’s guidance, and platelet transfusion may be needed if the condition is serious. 3. Treatment for the cause: there are many reasons for thrombocytopenia, and it needs to be treated for the cause while supporting the treatment, such as: allergic purpura may need prednisone and hydrocortisone treatment, and bone marrow metastatic cancer and lymphoma cause the need for anti-tumor treatment (cyclophosphamide, vincristine) and so on. Platelet 12×10⁹/L should go to the regular hospital in time, and the doctor will determine the specific condition and give the correct treatment according to the specific symptoms, signs and auxiliary examination.