Platelets higher than normal value is considered to be caused by myeloproliferative diseases, primary thrombocytosis, malignant tumors and other diseases. Platelets are small pieces of cytoplasm shed by the cytoplasmic cleavage of mature megakaryocytes in bone marrow, with a normal value of (100~300) × 10⁹ / L. The physiological mechanism of platelets is to stop hemorrhage and to form blood clots. If platelets are higher than normal, meaning that the platelet count is greater than 400 × 10⁹ / L, they can be categorized as primary thrombocytosis and secondary thrombocytosis. Primary thrombocytosis is usually caused by diseases such as myeloproliferative disorders and essential thrombocythemia. Secondary thrombocytosis, on the other hand, is usually caused by malignant tumors, acute infections, acute blood loss, acute hemolysis and other diseases. If the platelets are found to be higher than normal value, you should seek medical treatment in time for relevant examinations to make a clear diagnosis. If it is a malignant tumor of the blood system, it is necessary to actively cooperate with the doctor’s treatment to avoid delaying the condition and endangering the health.