People's inflammatory reaction under the action of an inflammatory factor can lead to the increase of platelets, while other values are normal. The normal platelet content of human is 100-300 * 10 9/L, which is slightly higher than the normal value. If other values are normal and asymptomatic, there is generally no problem. Only platelets are involved in blood coagulation, so higher values will increase the possibility of thrombosis. Thrombocytosis: 400 x 109/L is thrombocytosis, while primary thrombocytosis is common in myeloproliferative diseases, such as chronic myeloid leukemia, polycythemia vera, primary thrombocytosis, etc. Reactive thrombocytosis is common in patients with acute and chronic inflammation, iron deficiency anemia and cancer, and the increase range is generally less than 500×109/L/L. After treatment, the situation improves and the number of platelets will soon drop to normal level. Platelets (BPC) are separated from the cytoplasm of mature megakaryocytes in bone marrow. They have different shapes and sizes, and are easy to adhere, aggregate and destroy. BPC is of great significance in forming white platelet thrombus, releasing platelet factor, promoting coagulation and blood clot contraction, and it is one of the important indexes to study hemostasis and coagulation disorders. 1. Physiological changes: Platelets increase after exercise and eating, and can be recovered after rest. The fluctuation range of daily platelet count in normal people is 6- 10%, which is lower in the morning and slightly higher in the afternoon. Low in spring and high in winter. Women's platelets will decrease before and after menstruation, and the platelets can be reduced by half on the first day of menstruation, and then gradually increase. 2. Pathological changes ① Thrombocytosis is common in acute suppurative infection, acute blood loss, after splenectomy, hemolytic anemia, polycythemia vera and chronic myeloid leukemia.