Iron supplements have a stimulating effect on the gastrointestinal tract, and gastrointestinal reactions are the most common adverse reactions to iron supplements, often including stomach pain, nausea, vomiting, constipation, and so on. Iron supplements can be adjusted to take after meals or during meals, with vitamin C to help its absorption, pay attention to avoid drinking strong tea, coffee, etc. during oral iron. Eat more red meat such as pork and beef, blood products such as pork liver and blood, and iron-rich foods such as jujube and spinach. During pregnancy to meet the growth and development of the fetus, the demand for iron increases, or due to pregnancy vomiting, indigestion, etc. to affect the absorption of iron, easy to iron deficiency anemia, iron supplementation treatment after diagnosis is necessary. If the abdominal pain is serious, you should consult a doctor, reduce the dosage, change the medication or add the medication to protect the gastric mucosa under the doctor’s guidance, pay attention to the investigation of other causes of abdominal pain, and have a regular review.