Possible causes of high white blood cells and platelets without any symptoms include both physiologic and pathologic conditions. 1. Physiologic: such as pregnancy, it can cause physiologic increase in white blood cells and platelets. In this case, pregnant women usually do not have any symptoms. 2. Pathological: if there are high white blood cells and platelets, the common cause is bacterial infection, such as bacterial pneumonia, folliculitis, lung abscess, biliary tract infection, etc. Early in the course of infection, patients usually have no symptoms, and some of them can only be detected through blood tests. High white blood cells and platelets can also be seen in blood diseases, such as chronic granulocytic leukemia. If the above symptoms occur, it is recommended to go to the hospital as soon as possible to identify the cause of the disease, and under the guidance of the physician for targeted treatment.