Pregnancy four months stomach pain can be physiological manifestations, can also be pathological factors. 1. Physiological phenomenon: four months pregnant belly hidden pain may be because with the gradual development of the fetus, the uterus is also gradually increased, in pulling the uterine ligaments, some pregnant women will feel the stomach ache with hidden pain performance. The pain is mostly located in the lower abdomen on one side of the uterus or both sides of the uterus, is involving pain, dull pain or hidden pain. The pain is obvious when walking and straining, and can be relieved by bed rest. Usually do not need special treatment. 2. Pathological factors: four months pregnant with vague pain in the stomach may also be uterine adnexal abnormalities such as inflammation, cysts or tumors; may also be due to ureteral stones, appendicitis and other diseases can also cause vague pain in the stomach. At this time, you need to go to the hospital. Pregnant women in the fourth month of pregnancy, pay attention to rest, ensure adequate nutrition, maintain a good mood, have vague pain in the stomach or vaginal bleeding, consult a doctor in time to clarify the cause and standardized treatment.