There are mainly the following situations: 1, uterine contraction will cause vague pain in the abdomen, some women’s uterus contraction recovery after childbirth is not very good will also appear 20 days after the stomach pain; 2, vaginal inflammation or pelvic inflammatory disease will also cause stomach pain; 3, after childbirth in the uterus tissue residue caused by puerperal infection will also cause pain in the abdomen. At this time, the mother should go to the hospital for a gynecological ultrasound examination to see how the uterus is recovering and whether there are residues in the uterine cavity. In addition, it is also recommended that the mother should not have intercourse until 2 months after the birth of the child, to keep the vulva clean and clean underwear. 4, to pay attention to dietary hygiene, can not eat cold, stimulating, spicy food to avoid gastrointestinal symptoms, because this will also cause abdominal pain about 20 days after delivery.