Vomiting in the second trimester of pregnancy may be caused by dietary abnormalities, gastritis or overdose of folic acid. 1. Dietary abnormalities: When women in late pregnancy eat spicy and stimulating or cold food, it will irritate the stomach and intestines, causing indigestion and vomiting and other symptoms. 2. Gastritis: When a woman in late pregnancy suffers from gastritis, if she has an unclean diet, it is very likely to lead to the onset of the disease, vomiting and abdominal pain and other symptoms. 3. Overdose of folic acid: Folic acid has many benefits for pregnant women, but it should be noted that long-term use of the drug may stimulate the stomach and intestines, nausea and vomiting and other adverse reactions. Vomiting in late pregnancy may also be caused by other reasons, it is recommended that patients go to the hospital in time to clarify the cause of the disease.