Sudden vomiting in the seventh month of pregnancy may be caused by the uterus pressing on the gastrointestinal tract, or it may be caused by gastroenteritis, or it may be caused by pre-eclampsia, and the reasons are different, and the treatment methods are also different. 1. Uterine compression of the gastrointestinal tract: seven months pregnant, as the fetus tends to mature, so the size of the fetus is relatively large, the size of the uterus is also relatively large, this time the increased uterine compression of the gastrointestinal tract, may lead to pregnant women to appear seven months pregnant, suddenly vomiting symptoms, which is a normal phenomenon, you can let the pregnant woman to eat small meals, eat more easy to digest the food to alleviate the symptoms. 2. Gastroenteritis: If the pregnant woman has eaten unclean food, gastroenteritis, may also lead to symptoms of vomiting, treatment should let the pregnant woman eat a light diet, you can also use probiotic preparations to regulate the intestinal micro-environment. 3. Pre-eclampsia: Pre-eclampsia may also lead to pregnant women to appear seven months pregnant suddenly vomit very serious symptoms, in addition, pregnant women will also appear high blood pressure, headache, limbs convulsions and other symptoms, treatment should keep pregnant women’s airways open, can use magnesium sulfate antispasmodic, diazepam sedation, but also the use of labetalol, nifedipine, and other drugs to lower blood pressure. If the seventh month of pregnancy suddenly appeared to vomit very serious symptoms, it is recommended to consult a doctor in time to identify the cause and ask the doctor to be disposed of.