Low white blood cell count, 2000/L, it is recommended to visit a hospital to find the cause of lower white blood cell count; viral infection is a common cause of reduced white blood cell count, such as influenza, viral hepatitis, chicken pox, rubella, etc.; long-term exposure to radiation, poisoning caused by various physical and chemical factors, chemotherapy and radiotherapy for tumors, hypersplenism, autoimmune diseases, certain blood diseases such as aplastic anemia, myelofibrosis and The application of certain drugs can lead to a decrease in white blood cell count, so the cause should be identified and treated. When the white blood cells are low, the body is prone to infections, such as respiratory infections, genitourinary tract infections, fatigue, dizziness, loss of appetite, fever, and even sepsis and septicemia. At this time, it is important to pay attention to reduce the number of visits to crowded places and keep the skin and mouth clean.