Nausea, regurgitation and desire to vomit after eating may be pregnancy, but it may also be acute gastroenteritis, indigestion, pancreatitis, etc. After pregnancy, the placenta will produce progesterone, and due to the stimulation of progesterone, the function of the gastrointestinal system will also be affected. Many women experience nausea and vomiting after meals due to the stimulation of progesterone, which leads to excessive secretion of gastric acid and slow gastrointestinal motility. However, not all nausea and vomiting after meals are caused by pregnancy, some of them are caused by gastrointestinal diseases. When acute gastroenteritis strikes, due to inflammation in the gastrointestinal mucosa, peristalsis is hyperactive and internal pressure increases, which not only causes abdominal pain and diarrhea, but also nausea and vomiting. When indigestion occurs, food in the stomach cannot be discharged in a timely manner, which can cause irritation to the stomach wall. When the stomach wall spasms and contracts, nausea and vomiting can occur due to squeezing of food in the stomach. During an attack of pancreatitis, in addition to severe stomach pain, the patient will also experience nausea, vomiting and regurgitation due to the lack of digestion of food by pancreatic juice.