Monocytes are a type of white blood cell. Clinical causes of high white blood cells and monocytes are both physiological and pathological. It is normal for the body to be examined after strenuous exercise or in a cold environment or after a full meal, suggesting that high leukocytes and monocytes are relatively normal, but pathological causes cannot be excluded. Infectious diseases include pneumonia, cystitis, etc. In addition, some patients with gastroenteritis may also have high WBCs and monocytes, while non-infectious diseases include hemorrhage, poisoning, trauma, etc. However, it is not excluded that there may be high leukocytes and monocytes without any symptoms. It is recommended to go to the hospital for detailed examination, and if there are symptoms associated with it, symptomatic treatment should be done under the guidance of the doctor.