The reference value for normal percentage of lymphocytes is 20%-40%. Lymphocytes are immune cells and when the absolute value is high, the body’s immunity is low and it is easy to get infected with diseases during this period. A high percentage of lymphocytes may be due to a common viral infection that will have long-term chronic inflammation. If it is very high, it may be a blood system disease, which is commonly caused by certain viral infections, such as influenza, typhoid fever, etc. Detailed examination in the hospital is recommended. Low red blood cells are also very common in life and are usually a sign of anemia. Anemia is a pathological condition in which the amount of hemoglobin, the number of red blood cells and the red blood cell pressure area per unit volume of circulating blood are lower than normal. There are various causes of anemia: iron deficiency, hemorrhage hemolysis, hematopoietic dysfunction, etc. Generally, a diet rich in nutrients and high in calories, high in protein, high in vitamins, and rich in inorganic salts should be given to help restore hematopoietic function.