The meaning of low absolute neutrophil count is to indicate that there may be infections, hematologic disorders, and physicochemical damage. 1. Infections: Some bacterial infections, such as typhoid fever, can lead to a decrease in both the total number of white blood cells and neutrophils. Some viral infections, such as influenza, can also cause leukopenia. 2. Blood system diseases: such as aplastic anemia, severe iron deficiency anemia, paroxysmal sleep hemoglobinuria, etc., which can cause neutropenia and often accompanied by platelet and red blood cell reduction. 3. Physical and chemical damage: X-ray, benzene, sulfonamides and other applications can cause leukopenia and neutropenia. Neutropenia may also be an adverse reaction to certain drugs taken by the patient. Patients may also experience neutropenia while undergoing radiotherapy. If the cause of the disease is ruled out, such as the use of medication or the receipt of radiotherapy, the patient should go to the hospital in a timely manner, so that the doctor can clarify the cause of the disease and, if necessary, carry out the appropriate treatment.