There are two possibilities for mid-pregnancy stomach pain like diarrhea, one is physiological pain, due to the continuous development of the fetus, the uterus increases, pulling the ligaments and stimulating the intestines, resulting in hidden abdominal pain. The other is pathological pain, such as urinary tract infection, acute gastroenteritis, pre-eclampsia, etc., which can cause diarrhea-like pain, and it is recommended to treat it under the guidance of a doctor.1. Physiological pain: the uterus is getting bigger and bigger in the middle of pregnancy with the development of the fetus, which has a pulling effect on the uterine ligaments and stimulates the surrounding intestines, which may produce diarrhea-like pain. It is recommended that pregnant women pay attention to rest and listen to soothing music to divert their attention, and the symptoms will generally gradually reduce; 2. Pathological pain: pregnant women suffering from urinary system infection or acute gastroenteritis, etc., may cause abdominal pain and mid-pregnancy stomach pain. In this case, you should seek medical attention in time, go to the obstetrics and gynecology department for examination to clarify the cause and actively cooperate with the doctor for treatment. Of course, mid-pregnancy belly pain like diarrhea cannot exclude the possibility of pre-eclampsia. If the abdominal pain persists without relief or is accompanied by vaginal bleeding, you need to seek timely medical attention for fetal preservation treatment.