There are many causes of platelet reduction: 1) autoimmune diseases: such as systemic lupus erythematosus; 2) endocrine diseases: such as hyperthyroidism and hypothyroidism; 3) liver and spleen diseases: such as liver cirrhosis and hypersplenism; 4) hematological tumors: such as multiple myeloma and lymphoma; 5) acute leukemia. The clinical manifestations of thrombocytopenia are mainly petechiae, petechiae, bleeding from gums and nasal cavity, and in the case of women of childbearing age, it will lead to an increase in the amount of menstruation. Therefore, the most critical thing is to go to a regular hospital to find a specialist for further examination, to find the cause of the disease, and to treat the cause accordingly. Depending on the condition, clinical examination may be required to improve bone marrow examination, blood sampling to improve thyroid function, rheumatic antibody testing, ultrasound examination to rule out spleen enlargement, etc.