Anemia is a common clinical condition in which the volume of peripheral blood red blood cells in the body is reduced below the lower limit of the normal range. A hemoglobin of less than 120 g/L in adult males, less than 110 g/L in adult females, and less than 100 g/L in pregnant women is generally considered to indicate anemia. Symptoms of anemia are characterized by: i. Clinical manifestations include dizziness, headache, tinnitus, insomnia, dreaminess and memory loss in the nervous system; palpitations, shortness of breath, shortness of breath and dyspnea in the respiratory and circulatory system; loss of appetite, bloating, nausea and constipation in the digestive system, and other symptoms related to various systems. Second, physical examination will show pale skin and mucous membrane, and hemolytic anemia will show yellow staining. Usually, the cause of anemia should be identified and treated for the cause. In urgent cases, if the anemia is severe, blood transfusion is needed to correct the anemia.