Vague pain in the stomach in the fifth month of pregnancy is commonly caused by the enlargement of the uterus pressing on the surrounding tissues and organs during pregnancy, but abnormalities such as gastrointestinal lesions, pre-eclampsia and placental abruption cannot be ruled out, it is recommended to seek medical attention in time to observe the growth and development of the fetus. In the fifth month of pregnancy, if there is only vague abdominal pain and no other discomfort, it is considered to be related to the rapid growth of the fetus in the middle of pregnancy, and the enlarged uterus stimulates the pelvic organs, causing a certain degree of extrusion and pain, which can be relieved after rest. In addition, mid-pregnancy fetal movement or occasional contractions, for some more sensitive pregnant women, may also be expressed as vague pain, at this time can first observe. In the fifth month of pregnancy, if the vague pain in the abdomen is accompanied by diarrhea, nausea, low fever and other manifestations, consider the onset of acute gastroenteritis, chronic gastroenteritis, peptic ulcer due to unclean diet or cold, which can cause the feeling of vague pain in the stomach, if the diarrhea stops and the abdominal pain is relieved the next day after rest, there is no need to worry. If the symptoms of abdominal pain and diarrhea continue to worsen, it is recommended to visit a gynecologist immediately and also ask for a consultation with a gastroenterologist. If the pain is obvious in the fifth month of pregnancy, accompanied by bloody vaginal discharge or fluid, it is considered a sign of pre-eclampsia, and it is necessary to go to the hospital immediately to clarify the status of the fetus at this time and take active treatment to preserve the fetus. The above are some of the more common cases. As there are many abdominal organs, a lesion in any one of them may cause vague pain in the stomach, so after abdominal pain appears, you should carefully observe whether there are other uncomfortable symptoms. If the pain is relieved by rest or gradually reduced, there is no need to worry at this time. If there are other systemic symptoms, such as diarrhea, jaundice, frequent urination and odor of vaginal discharge, you should seek medical examination in time.