The stomach pain and vomiting can be caused by acute gastroenteritis, cholelithiasis, pancreatitis, intestinal obstruction and other diseases. 1. Acute gastroenteritis: Acute gastroenteritis can cause abdominal pain, diarrhea, vomiting and other symptoms, but also fever and other systemic manifestations. 2. Cholelithiasis: gallbladder stones can stimulate inflammation of the gallbladder, and the condition worsens after eating greasy food, which can cause pain in the right upper abdomen, feasible right shoulder and back, and accompanied by nausea, vomiting and other discomforts. 3. Pancreatitis: Acute pancreatitis is usually characterized by acute abdominal pain as the first symptom, the pain is mainly in the middle and left upper abdomen, and the pain can be directed to the back of the waist, accompanied by nausea, vomiting and other symptoms. 4. Intestinal obstruction: when intestinal obstruction occurs due to intestinal blockage, the intestines above the obstruction can undergo violent peristalsis, which in turn triggers the symptom of abdominal pain, and the obstruction position is higher, the manifestation of vomiting can occur in the early stage. There are many reasons for stomach pain and vomiting, it is recommended to consult a doctor as soon as possible, under the guidance of specialists to actively carry out appropriate treatment, which will help to alleviate the uncomfortable symptoms as soon as possible.