Anemia refers to a lower-than-normal volume of red blood cells in the peripheral blood and a series of symptoms that the patient experiences. The manifestations of anemia are: i. Neurological symptoms. Patients often have a series of symptoms such as headache, dizziness, tinnitus, blurred vision, insomnia, forgetfulness, memory loss, etc. The causes are related to the lack of blood and oxygen in brain tissue. In the case of infants and young children, there is often also irritability at night, crying and restlessness, sleep not quiet, and even affect the development of intelligence. Due to ischemia and hypoxia of limb muscles, the patient’s motor ability decreases significantly, and he/she feels weakness of limbs when moving slightly and needs to sit down to rest. Symptoms of cardiopulmonary function, due to the increased burden on the heart and lungs after anemia, the patient will experience panic, chest tightness, shortness of breath, etc. Especially after activity, the panic, chest tightness and shortness of breath will be more obvious.