Low white blood cells are prone to infectious diseases, and in severe cases, sepsis and even sepsis can occur, threatening the life of the patient. Because white blood cells are the cells responsible for immunity in the body, especially neutrophils, which are the first line of defense against foreign bacterial invasion. When the number of leukocytes decreases, the number of neutrophils also decreases severely and the patient’s ability to resist decreases significantly. If the number of neutrophils in the peripheral blood is low poly 500/mL, it is called granulocyte deficiency. The patient’s immune status will then be significantly reduced and resistance to various pathogenic microorganisms will be severely reduced. Patients are prone to severe infections, which can manifest as chills, chills, and high fever. In severe cases, bruising of the skin and mucous membranes may occur, producing sepsis. Poorly controlled sepsis can lead to sepsis, which can manifest as joint abscesses, oral abscesses, or cranial abscesses, seriously threatening the patient’s life.