Iron is one of the most basic trace elements in the human body, and its importance is mainly reflected in the iron in hemoglobin, which is an essential carrier of oxygen supply to the human body and an essential component of the human circulatory system. Iron deficiency first affects the blood supply function, resulting in pale skin, tongue swelling, easy slackness and fatigue, gastrointestinal disorders, reducing the immune system’s resistance to external aggressions, and may also reduce the activity of various enzymes in the body, leading to lesions. Compared to men, women are more likely to cause iron deficiency, which is directly reflected as iron deficiency anemia. Clinically, this is mainly reflected by a dull complexion, dark circles under the eyes, intermittent chest tightness, dyspnea, nausea and acid reflux after meals, and even shock and menstrual disorders. For adolescents, it may lead to loss of energy, yellowing of the face, easy sleepiness, yellowing of the hair, and may easily induce peptic intestinal ulcers. In older adults, iron deficiency may lead to qi deficiency, tinnitus, blurred eyes, and even intermittent migraines. Iron deficiency is more likely to occur in the frail elderly, women, and children, especially in adolescent growing children. Long-term iron deficiency in adolescent children may lead to mental retardation and stunted development. It is recommended to use pure iron pans for stir-frying at home or take iron supplements to relieve the problem, eat more red dates and animal liver on a daily basis, but iron supplementation should also be moderate.