After pregnancy, there is vague pain in the abdomen mainly due to the following three reasons: a. After pregnancy, as the fertilized egg is laid in the uterus, and then gradually grows, the uterus also grows gradually, in the process of uterine enlargement will appear physiological lower abdominal vague pain, this situation does not affect life, no special treatment. The second, there may be a pre-miscarriage and cause abdominal vague pain, must pay attention to more rest, do not have intercourse. If abdominal pain worsens or vaginal bleeding occurs, you should immediately go to the hospital and give fetal preservation treatment according to the embryonic condition. Third, see the pelvic inflammatory disease, such as chronic pelvic inflammatory disease, enteritis or appendicitis can cause lower abdominal pain, it is recommended to go to the hospital to improve the relevant examination and symptomatic treatment.