Clinical manifestations of anemia include: 1. Patients will have dizziness, weakness, pallor, and feel palpitations and shortness of breath after activity, as well as memory loss, sleep disorders, drowsiness, blurred vision, and in severe cases, dyspnea. 2. Special clinical symptoms, such as patients with iron deficiency anemia, in addition to the above symptoms, can also manifest as stomatitis, tongue inflammation, swallowing difficulties, heterophagia, thinning and flattening of nails, and Patients with megaloblastic anemia will have loss of appetite, nausea, vomiting, mirror tongue, accompanied by numbness of hands and feet, lower limb movement disorders, and in severe cases, mental disorders. Patients with severe anemia will cause anemic heart disease, causing insufficient blood supply to the heart muscle, angina pectoris, myocardial infarction, and heart failure, and severe anemia will also lead to anemic encephalopathy, causing insufficient blood supply to the brain and Severe anemia can also lead to anemic encephalopathy, causing insufficient blood supply to the brain, dizziness, convulsions and even coma. If women have severe anemia, it can also cause endocrine disorders and menstrual disorders, and anemia in infants and children can affect intellectual development.