An increase in cell count may refer to an increase in peripheral blood hematocrit, due to normal physiological conditions, or it may be caused by pathologic leukocytosis such as bacterial infection and erythrocytosis such as secondary erythrocytosis. 1. Leukocytosis (1) Physiological causes: Physiological increase of leukocytes is mainly seen in strenuous exercise, strong physical activities, and severe mental stimulation. Low blood sugar occurs in hunger, severe cold conditions can lead to leukocytosis, this is because when the body is stimulated by various physiological factors, the body will increase catecholamines, which can lead to the edge of the white blood cells into the blood circulation, so it will lead to an increase in the number of white blood cells. (2) Pathological causes: The increase in cell count due to pathological causes is usually due to bacterial infection, and the degree of bacterial infection is often proportional to the degree of increase in white blood cell count. In addition, diseases of the hematopoietic system, such as leukemia, may also cause an increase in the white blood cell count. 2. Erythrocytosis Secondary erythrocytosis can be seen in diseases such as renal and hepatocellular carcinoma, and primary erythrocytosis can be seen in true erythrocytosis. It is suggested that if you have any abnormal discomfort, you should go to the hospital in time, and make a clear diagnosis under the guidance of the doctor, so as to avoid delaying your condition.