Low blood count is a decrease in the number of white blood cells in the blood routine. The decrease in white blood cells is below the normal range, which may be caused by diseases, or may be related to drugs and radiation causes. Patients are advised to improve relevant examinations, actively treat the primary disease, and eliminate the causative factors to bring the white blood cells back to normal.1. Disease effects: Patients with infectious diseases, such as chronic rhinitis and chronic pharyngitis, or rheumatic immune diseases, have immune system abnormalities that lead to lower white blood cell counts. In addition, blood system diseases, such as aplastic anemia, myelodysplastic syndrome, etc., hematopoietic stem cells are damaged and leukopenia occurs resulting in low blood count. At this time, patients need to apply the appropriate drugs under the guidance of the doctor to actively treat; 2. Drug effects: If the patient has recently used anti-thyroid drugs, anti-inflammatory painkillers, some antibacterial drugs, chemotherapy drugs, a decrease in white blood cells can occur, resulting in low blood count. For example, chemotherapy drugs can lead to the inhibition of the patient’s bone marrow hematopoietic function, resulting in a decrease in white blood cells. Patients can switch drugs appropriately under the guidance of a doctor, or use drugs that elevate white blood cells; 3, the impact of radiation: long-term exposure to X-rays, etc., accumulate in the body and have a certain degree of lethality on white blood cells, which can lead to leukopenia. Patients are advised to reduce exposure and take drugs such as lisinopril and vitamin B4 to increase white blood cells under the guidance of a doctor.