The vague pain in the lower abdomen at 30 weeks of pregnancy may be a normal physiological phenomenon, but it may also be caused by pathological factors such as preterm labor and gastrointestinal cramps, so you should go to the hospital in time to find out the cause and treat the cause. Physiological factors: During pregnancy, the uterus is gradually increasing in size, so it is easy to feel pain in the abdomen, such as the results of the maternity examination is not abnormal, keep a happy mood, adequate rest can be, do not worry too much. Second, pathological factors: 1, preterm labor: manifested as vague pain in the lower abdomen, paroxysmal episodes, accompanied by a small amount of vaginal bleeding, and sometimes even a gradual shortening of the cervical canal, V-shaped or even U-shaped dilatation. Therefore, if you have vague abdominal pain at 30 weeks of gestation, consider the possibility of preterm labor. In this case, you should go to the hospital for gynecological examination and ultrasound in time to find the cause if there are regular contractions or shortening of the cervical canal. After excluding the factors of infection, if there are still persistent contractions, you can give contraction inhibitors for fetal preservation treatment, such as magnesium sulfate, to try to avoid the occurrence of preterm labor; 2, gastrointestinal cramps: can be manifested as recurrent episodes of abdominal vague pain. Gastrointestinal cramps in pregnant women, first of all, bed rest, avoid walking, drink more warm water water, use hot water bags local heat compresses to relieve the symptoms of cramps. If the symptoms of gastrointestinal cramps of pregnant women keep worsening, it is recommended that pregnant women can be taken to a Chinese medicine hospital for consultation, so that the herbalist can prescribe some herbal formulas that will strengthen the spleen and stomach, reduce inflammation and not affect the development of the fetus, and also allow the herbalist to help massage the pregnant women appropriately to relieve the pain symptoms. Pregnant women with gastrointestinal cramps during pregnancy should not be anxious, keep their mood happy, pay attention to eating less and eating more, and strengthen exercise, which will have a certain auxiliary effect on the relief of the condition; 3. Urinary tract infection: manifested as frequent urination, urgent urination, painful urination, and pain or pressure above the pubic bone when urinating, that is, vague pain in the lower abdomen. After the symptoms of urinary tract infection, you should first go to the hospital for examination, and then choose the appropriate antimicrobial agent according to the results of the drug test, the more commonly used drugs are cephalosporins. While using medication, pregnant women should also pay attention to drink more warm water and try not to drink carbonated drinks.