Low red blood cells, should be based on the actual situation of the patient, the choice of drug therapy supplementation and food supplementation, serious cases can be directly into the red blood cells. The causes of low red blood cells are different, and so are the ways and medications chosen to supplement red blood cells. The following is an explanation of physiological factors and pathologic factors. 1. Physiological factors: drinking a lot of water after exercise dilutes the blood concentration, which reduces the concentration of red blood cells, and this does not require treatment. 2. Pathological factors (1) Low red blood cell in female pregnancy is common in iron deficiency anemia, which requires iron supplementation, such as ferrous succinate. (2) Megaloblastic anemia requires folic acid and vitamin B₁₂ supplementation. (3) Aplastic anemia, a decrease in bone marrow hematopoiesis, is treated with immunosuppressants such as cyclosporine and androgens such as testosterone undecanoate. (4) Hemolytic anemia, treated with glucocorticoids such as prednisone. (5) Caused by leukemia and myelodysplastic syndromes, it can be treated with chemotherapy with drugs such as cytarabine and zorubicin. Mild red blood cell reduction can be supplemented by eating more animal heart, liver, kidney, lean meat, soybeans, eggs and other foods. Severe patients, such as leukemia or tumor-induced severe anemia need to follow the doctor’s instructions for direct red blood cell transfusion. If there is any discomfort, you should consult a doctor in time and follow the doctor’s instructions.