Causes of increased platelets include surgery, trauma, infection, primary thrombocythemia, and iron deficiency anemia. 1. Surgery, trauma, infection: Platelets can be elevated secondary to surgery, trauma, infection, and will usually recover gradually as the infection is controlled or bleeding gradually improves. 2. Primary thrombocythemia: gene mutation can lead to primary thrombocythemia, which belongs to bone marrow proliferative tumor and can cause platelet increase, usually need to inhibit bone marrow proliferation treatment, drugs include hydroxyurea and so on. 3. Iron deficiency anemia: the disease can also lead to a significant increase in the number of platelets, usually after supplementation with iron such as ferrous succinate, the number of platelets will gradually recover. There may be other reasons for the increase in platelet count, so it is recommended that relevant examinations be conducted under the guidance of a doctor to clarify the cause of the disease and standardize the treatment so as to avoid delaying the condition.