Lymphocytes below 0.8×10⁹/L are abnormal and more prone to disease, as well as suggestive of hematologic disorders, immunodeficiency disorders, etc., and the cause of the disease should be identified in a timely manner. The normal range of lymphocytes is (0.8~4)×10⁹/L, which generally accounts for 20%~30% of the total number of white blood cells. When it appears to be lower than 10%, it indicates that the organism is at a higher risk of contracting diseases, and it can also be seen in aplastic anemia, leukemia, and other hematologic diseases. 1. When lymphocytes are lower than normal, it means that the body’s immunity has declined, and it is more vulnerable to bacterial and viral infections, and even a series of symptoms such as fever and fatigue may occur. 2. Decreased lymphocytes can also occur when suffering from aplastic anemia, leukemia, myelodysplastic syndromes and other blood system diseases. 3. Immunodeficiency diseases: Lymphocyte drop may occur in HIV infection and immunodeficiency diseases. When you find that the lymphocyte value is low, you should do further relevant examinations to determine the cause of the decrease, according to the corresponding symptoms of differential diagnosis, such as anemia and splenomegaly should be done to rule out leukemia by bone marrow aspiration. You should also pay more attention to rest and eat less spicy and stimulating food to reduce the risk of the disease. Diagnosis and treatment should be carried out under the guidance of a physician.