Mild anemia is defined as a hemoglobin concentration in the peripheral blood between 90-120 g/L. Patients with mild anemia are very common in clinical practice. The common symptoms of mild anemia are: a. mild pallor, dizziness, weakness, sometimes tinnitus, and forgetfulness, which are often mild and usually do not attract the patient’s attention; b. decrease in motor function, generally physical activity is not affected, but if doing more intense exercise and longer exercise, the patient’s endurance will be reduced; c. decrease in respiratory and circulatory function. Normally, one does not feel palpitations and chest tightness, but when participating in physical activities, the symptoms of palpitations and chest tightness are more obvious and often require stopping and resting to relieve them. Therefore, it is important to pay attention to the symptoms of mild anemia, because moderate and severe anemia are developed from mild anemia.