Iron is an important trace element in the human body, and prolonged iron deficiency in the body can lead to iron deficiency anemia, which can cause a variety of adverse consequences after hypoxia, and can also have obvious harm to children’s growth and development and pregnant women’s pregnancy. 1, patients with severe iron deficiency anemia usually have pale complexion, dry hair, inflammation of the corners of the mouth, dizziness and tinnitus, chest tightness and shortness of breath, fatigue, irritability and concentration. Symptoms such as lack of concentration; 2. Children with severe iron deficiency anemia will affect the intracranial nerve reaction, appearing such phenomena as unresponsiveness, and also have slow growth in height and weight; 3. If a pregnant woman has severe iron deficiency anemia, the nutrition in the womb during pregnancy is supplied by the mother through the blood, which will affect the nutritional supply of the mother to the fetus, leading to anemia, underweight, premature birth, stillbirth and miscarriage in the newborn; 4. Patients with severe iron deficiency anemia will also have problems with the compensatory function of the heart, which can easily cause rapid or irregular heartbeat, and in serious cases, may lead to heart enlargement, angina pectoris, heart failure, etc. If the disease should be treated in time, generally clinical treatment is often done by adjusting the diet, iron supplementation, blood transfusion, etc. You can also eat iron-containing foods in moderation on a daily basis, such as animal liver, beans, cherries, etc.