27 weeks refers to 27 weeks of pregnancy. Sudden regurgitation and vomiting at 27 weeks of pregnancy may be due to fetal compression, combined acute gastroenteritis of pregnancy, neurological disorders and other reasons. 1. Fetal compression: with the gradual increase of the fetus, the bottom of the uterus gradually rises, and gastrointestinal reactions, such as nausea, vomiting, acid reflux, etc., will occur when the stomach is compressed. 2. Acute gastroenteritis in pregnancy: If pregnant women eat unclean food, overeat, or eat too much greasy, raw and cold food during pregnancy, it may cause acute gastroenteritis in pregnancy, which may cause nausea, vomiting, diarrhea, abdominal pain and other symptoms. 3. Neurological disorders: Some pregnant women who suddenly experience vomiting, which is jet-like and accompanied by dizziness and headache, may be due to neurological disorders, such as: hypertensive encephalopathy, cerebral hemorrhage and so on. 27 weeks pregnant suddenly appeared regurgitation, want to vomit symptoms, it is recommended to go to the hospital in time, combined with the relevant items of the examination, to clarify the specific causes of the targeted treatment, so as to avoid the impact on the pregnant woman herself and the fetus.