There are many causes of increased platelets in children, including infection, anemia, primary platelet hyperplasia, Kawasaki disease, etc. The cause of this situation should be clarified and treated for the cause. Common causes and treatment measures 1, infection: such as respiratory tract infection, urinary tract infection or gastrointestinal tract infection and other diseases will lead to platelet reactive hyperplasia, should promptly go to the hospital, and actively treat the primary disease, the primary disease improved platelets can return to normal; 2, anemia: such as children suffering from iron deficiency anemia, there will be active bone hyperplasia, causing platelet hyperplasia, should actively treat the primary disease, you can eat iron-containing If iron deficiency is serious, you can also take iron supplements orally under the guidance of a doctor, such as ferrous sulfate or iron dextran, which should be taken after meals, the gastrointestinal tract reaction is small and easily tolerated, eating cereals, dairy will inhibit iron absorption, fish, meat, vitamin C can strengthen the absorption of iron. The main clinical manifestations of this disease are abnormal bleeding and thrombosis, which should be promptly treated with anticoagulant therapy, while hydroxyurea can be considered to hinder platelet production; 4. Avoid involving the heart and developing coronary artery dilatation and aneurysm formation, which affect the prognosis.