Iron deficiency anemia is a common benign anemic disease in clinical practice, and patients diagnosed with iron deficiency anemia generally need to be treated with iron supplements. In addition, tea and milk can inhibit the absorption of iron, so it is best not to drink tea or milk during oral iron supplementation. When taking iron supplements orally, some patients can experience mild gastrointestinal reactions, such as nausea, vomiting, diarrhea and other abdominal discomfort, and most patients can avoid gastrointestinal reactions by taking the drug after meals. If the gastrointestinal tract does not absorb iron well or if the gastrointestinal reaction is heavy, intravenous iron supplementation can be given, such as the application of iron sucrose or iron dextran, etc.