31 weeks pregnant stomach vaguely pain is generally not normal, mostly considered to be contractions, preterm labor, or digestive system, urinary system diseases. Specifics are as follows: 1, mild contractions: 31 weeks pregnant contractions are more common, because at this time the uterus has expanded with pregnancy, bilateral round ligaments pull muscles, resulting in mild contractions, sometimes accompanied by abdominal tightening and hardening. If necessary, you can follow the doctor’s advice to take drugs to inhibit contractions, pay attention to rest; 2, preterm labor: preterm labor pain is more intense than the contractions, and regular pain, usually 5-10 minutes on the pain once, accompanied by abdominal tightness and hardness, and even vaginal bleeding, this time you should seek medical attention in a timely manner, and you can follow the doctor’s advice to take the role of a stronger inhibitor of uterine contractions; 3, digestive disorders: digestive disorders occur. Gastrointestinal discomfort will also trigger abdominal pain, such as gastroenteritis, appendicitis, pancreatitis, constipation, etc., it is recommended to consult a doctor in a timely manner to check and treat; 4, urinary system diseases: urinary system infections, stones, and other diseases will trigger abdominal pain, such as urinary stones, etc., it should be timely to consult a doctor to check and treat. In short, when 31 weeks pregnant with mild abdominal pain, should first rest, light diet, if the situation does not improve or even pain persists, aggravated or accompanied by bleeding, should seek medical attention as soon as possible.