Usually iron deficiency anemia can be judged from the following aspects: 1. clinical symptoms: or such as pale face, especially pale eyelids and conjunctiva, weakness, panic, shortness of breath, dizziness after activity, etc., and some patients may also faint, and some patients will show psychoneurological abnormalities, easily irritable, children are prone to omnivorous fetishes, such as eating clods and other symptoms; 2. blood routine: iron deficiency anemia The blood routine of iron deficiency anemia is reduced hemoglobin, usually <120g/L, which is small cell hypochromic anemia, MCV, i.e. mean hemoglobin volume, mean hemoglobin concentration, and mean hemoglobin content are significantly reduced, while excluding thalassemia; 3, bone marrow picture: the bone marrow picture of red blood cells is hyperplastic anemia, mainly middle and late juvenile red blood cells hyperplasia, and the patient's blood smear shows that the whole red blood cell 4. abnormal iron metabolism: patients with iron deficiency anemia can show reduced serum ferritin, reduced serum iron, significantly increased total iron binding capacity, reduced transferrin saturation, and the staining of intracellular and extracellular iron in the bone marrow image is absent or reduced.