Low ferritin indicates that the body does not have enough iron reserves, as ferritin is the body’s storage form of iron. Low ferritin means that the iron content stored in the body is insufficient, and the patient will have symptoms of iron deficiency anemia, which manifests as pallor, dizziness, weakness, dryness of the hair, and thinning and brittle nails, spoon nails, etc. There are three most common reasons for lower ferritin: first, insufficient iron intake, especially in children and adolescents during the growth period and in women during pregnancy, because this group of people The demand for iron is larger than normal, and if iron-rich foods are not added in a timely manner, there will be a decrease in ferritin. Second, is the absorption disorder, such as chronic gastritis and enteritis patients, due to the absorption of iron disorder, will also appear ferritin reduced situation. Third, there is chronic blood loss, because the body’s iron, mainly in the aging red blood cells iron reabsorption to achieve, if there is blood loss, iron can not be reabsorbed, will also appear ferritin reduced situation.