There is no direct correlation between iron deficiency anemia and gray hair, because gray hair is influenced by hereditary factors and may also be related to mental factors and certain diseases. More correlated with diseases are vitiligo, tuberous sclerosis, neurofibromas. Some patients may have iron deficiency anemia due to certain diseases or ageing may lead to gray hair, but for most patients iron deficiency anemia does not necessarily lead to gray hair directly. Currently, due to mental stress, young people may also develop gray hair due to mental stress, anxiety, or irregular rest. In addition gray hair may be a genetic factor, such as younger children can develop gray hair, which is caused by genetic factors. Therefore, patients with iron deficiency anemia must find out the cause of iron deficiency, and timely symptomatic treatment is most crucial. Because different degrees of anemia affect the organism differently, hemoglobin concentration below normal but above 90g/L is mild anemia. Most patients with mild anemia do not have obvious symptoms, but if the hemoglobin concentration is 60-90g/L, obvious anemia symptoms appear. When the hemoglobin concentration is <60g/L, the symptoms associated with various kinds of anemia are more serious and even life-threatening. Therefore, it is important to diagnose and treat anemia and other related problems in a timely manner, which is also beneficial to the prognosis of patients.