Common causes of iron deficiency anemia include: 1. Insufficient intake of iron requirement: such as children during the birth period and pregnant women, maternity, long-term bedridden elderly, insufficient iron intake can cause iron deficiency anemia; 2. Iron absorption disorders: such as gastric ulcer, gastric cancer, enteritis and other diseases leading to iron absorption disorders; 3. Excessive iron loss: such as chronic blood loss caused by gastrointestinal bleeding, or parasites causing breakage of the gastrointestinal mucosa, chronic iron deficiency anemia is caused after blood loss. Therefore, patients with iron deficiency anemia should get rid of the causes in order to prevent the recurrence of anemia.