Secondary thrombocytosis is mainly caused by symptoms such as appendicitis, tonsillitis, abnormal thyroid function, anemia, etc. Secondly, secondary thrombocytosis is also related to physiological phenomena. 1. Infections such as tonsillitis and appendicitis cause a reactive increase in platelet count, which leads to secondary thrombocytosis. 2. Abnormal thyroid function, anemia and other diseases will lead to platelet generation disorder, which will further cause secondary thrombocythemia. 3. Physiological phenomenon: after meals and exercise, platelets in the body will be transiently elevated, that is, secondary thrombocythemia, but after a period of time will return to normal. In addition, for secondary thrombocythemia, it is necessary to go to the hospital for treatment in time so as not to cause blood clots; secondly, pay attention to healthy diet, regular life and work and rest. Specific diagnosis and treatment should be carried out under the guidance of physicians.