Low hemoglobin of 67g/L may be caused by megaloblastic anemia, hemolytic anemia, anemia due to acute blood loss, etc., which need to be treated with medication and surgery. 1. Megaloblastic anemia: patients with this disease will have palpitations, shortness of breath, loss of appetite and other symptoms, routine blood tests found that hemoglobin decreased to 67g/L, patients need to follow the doctor’s orders to supplement folic acid, calcium tetrahydrofolate. Some patients also need to supplement vitamin B12, as well as ferrous gluconate, ferrous fumarate and other iron supplements. 2. Hemolytic anemia: common symptoms include fatigue, drowsiness, dizziness and so on. Patients need to follow the doctor’s instructions to apply glucocorticosteroids such as prednisone and prednisolone, as well as immunosuppressants such as cyclophosphamide and azathioprine. If the patient’s condition is serious, splenectomy should be considered; if it is caused by the intrinsic defect of red blood cells, allogeneic hematopoietic stem cell transplantation should be taken. If the anemia worsens progressively or is combined with fever and other infectious symptoms, it is necessary to import component blood for treatment. 3. Anemia caused by acute blood loss: the patient will have symptoms such as tachycardia, dyspnea, thirst and lowered blood pressure. Doctors stop bleeding at the same time, patients need to quickly enter saline, dextrose anhydride, human albumin and other drugs, but also need to carry out blood transfusion treatment, which can restore blood volume in a short period of time. When the patient has a low hemoglobin of 67g/L, there are many other reasons, further examination should be done to clarify the specific cause of the disease and then cooperate with the doctor for standardized treatment. Drugs need to be used under the guidance of a doctor.