In general, platelets 300×10^9/L more is normal and has no significant effect on the human body, because the range of platelets in normal human peripheral blood is (100~300)×10^9/L, and platelets 300×10^9/L more may be within the normal fluctuation range of platelets. Sometimes a platelet 300×10^9/L more may be a reactive platelet increase. Common clinical causes include various infections such as respiratory infections, appendicitis, gastroenteritis, etc., which can also result in a reactive increase in the number of platelets. Also, severe trauma surgery, etc., can cause a reactive increase in platelet count. This increase is usually mild and does not last long, and as the reactive factors are removed, the platelet count will gradually drop to the normal range. Platelets 300×10^9/L more, generally normal, do not need to worry too much, also do not need special treatment, but if the patient itself has hypertension, hyperlipidemia and other emergency situations, you need to take aspirin and other drugs appropriate anticoagulation therapy.