A decrease in ferritin among the trace elements can cause iron deficiency anemia. The diagnosis of iron deficiency anemia is usually based on ferritin, and then bone marrow aspiration can be performed to reveal intracellular and extracellular iron deficiency, which can cause iron deficiency anemia. The treatment of iron deficiency anemia is mainly oral ferrous sulfate tablets, plus vitamin C, which can promote the absorption of iron, and then the diet should mainly be supplemented with iron, such as eating more lean meat and vegetables, which contain a relatively high level of ferritin. Then there is the iron pan for stir-fry, which will also increase the element of iron. See if you have lost any, such as hemorrhoids, increased menstrual flow this situation will also lose iron, to treat the original disease.