The phenomenon of nausea and vomiting after eating is mainly caused by the following reasons: 1. unclean food with a large number of bacteria, caused by the body after ingestion of the stomach, resulting in nausea and vomiting. 2. various diseases of the stomach, including gastric ulcer, gastric mucosa damage and pyloric obstruction, etc., after the stimulation of food, easily induced nausea and vomiting. 3. 3, nausea and vomiting caused by lower gastrointestinal tract diseases, including intestinal obstruction and intestinal perforation, which not only cause nausea and vomiting, but also lead to fever and general weakness. 4, patients with hypertension are especially prone to elevated blood pressure after eating, which leads to nausea, vomiting, and even dizziness. In addition, pregnant women may also experience early pregnancy vomiting in the early stages of pregnancy.