High white blood cells depending on the cause, some diseases will have recurrent fever such as leukemia, etc. Some diseases such as pneumonia, etc., can cause fever, but the symptoms are mostly relieved or disappeared after the infection is controlled, and will not have recurrent fever. 1. Leukemia: due to the tumor necrosis factor through the blood-brain barrier directly acts on the thermoregulatory center of the thermoregulation point, so that the thermoregulation point rises, causing fever. At the same time, leukemia patients with decreased body resistance is easy to secondary infection, which can lead to high white blood cells and repeated fever. 2. Other infectious diseases: such as pneumonia, the body is infected by bacteria and other pathogenic microorganisms, stimulating the body’s white blood cells rise, causing fever, generally after standardized treatment, infection control, the symptoms basically disappeared, will not cause repeated fever. There may be other reasons for high white blood cells, such as acute enteritis, etc. When high white blood cells are found, no matter whether they are accompanied by fever or recurrent fever, they should be examined in a timely manner to clarify the cause of the disease, and standardized treatment should be carried out under the guidance of the doctor.