Platelets 345 x 10^9/L is not considered serious. The normal value of platelets is (100~300) x 10^9/L. 345 x 10^9/L is just a slightly high value, so it is not serious. It may be related to diarrhea, trauma, and heavy sweating. The normal value of platelets is (100~300)×10^9/L, platelets 345×10^9/L belongs to a slight elevation, but it is not considered serious. When the patient has trauma, diarrhea, heavy sweating or infection, it will cause platelet elevation. The above situations are secondary, and after removing the triggers, the platelets will return to the normal level and no special treatment is needed. If patients find that the platelet count in the blood continues to increase, and the platelet count reaches 400×10^9/L, it can be diagnosed as thrombocythemia. There are many causes of thrombocythemia, such as primary thrombocythemia, etc. It is necessary to improve the relevant examinations to clarify the cause. It is recommended that the patient can be rechecked after a period of time to see if the platelet count is within the normal range. Specific diagnosis and treatment should be carried out under the guidance of a physician.