False contractions, gastrointestinal diseases, gynecological diseases, premature labor and other factors may be responsible for the vague pain in the abdomen at 30 weeks of pregnancy. 1. False contractions: in late pregnancy, some pregnant women may have false contractions, manifested as a vague pain in the abdomen, and there is no regularity, and the duration will not be too long, and generally can be relieved on their own. 2. Gastrointestinal diseases: some gastrointestinal lesions can also lead to symptoms of vague pain in the abdomen in the 30th week of pregnancy, such as acute gastroenteritis, etc., which may be accompanied by nausea, vomiting and other symptoms. 3. Gynecological diseases: such as pelvic inflammatory disease, may be related to poor hygiene, can cause pelvic and abdominal areas of soreness, pain, may also be accompanied by a small amount of vaginal bleeding, discharge odor and other symptoms. 4. Preterm labor: may be related to infection, uterine abnormalities, immune abnormalities and other factors, in the early stage of a vague pain, pain symptoms can gradually worsen, accompanied by water breakage and a small amount of vaginal bleeding and other abnormal manifestations. If you have a vague pain in the abdomen during the 30th week of pregnancy with other abnormalities, it is recommended that the pregnant woman consult a doctor for examination and treatment in a timely manner.