Symptoms of anemia include nervous system symptoms, respiratory and circulatory system symptoms, digestive system symptoms, urinary system symptoms, endocrine system symptoms and so on. 1. Nervous system (1) Headache, dizziness, depression, fainting, insomnia, dreaminess, tinnitus, blurred vision, memory loss, and inattention are common symptoms of anemia. (2) Numbness of the extremities can be caused by peripheral neuritis complicated by anemia, which is especially common in vitamin B deficiency megaloblastic anemia. 2. Respiratory and circulatory system (1) Increased respiration and heart rate, palpitation and shortness of breath after activity. (2) In severe anemia, shortness of breath or even telangiectasia may occur even in a calm state. (3) Long-term anemia can lead to anemic heart disease. 3. Digestive system: lack of appetite, nausea, bloating, abdominal discomfort, constipation or diarrhea. 4. Urinary system: (1) Clinical manifestations of primary kidney disease. (2) oliguria, anuria, renal insufficiency. 5. Endocrine system: long-term anemia will affect the function of thyroid, gonads, adrenal glands, pancreas, resulting in abnormal hormone secretion. Daily life and attention to dietary adjustments to provide sufficient hematopoietic substances for the bone marrow can prevent the occurrence of anemia.