Vomiting yellow bile is usually caused by the following reasons: first, acute gastroenteritis, acute gastroenteritis is an acute inflammation of the gastric mucosa that occurs in addition to vomiting bile, there are also symptoms of abdominal pain, diarrhea and fever, mostly due to overeating, unclean diet or food poisoning. Second, bile reflux gastritis, refers to gastritis caused by bile reflux, there will be symptoms of vomiting bile, usually caused by incomplete closure of the pylorus, gastric emptying disorder, or duodenal dysfunction. Third, liver and gallbladder diseases, common are cholecystitis, gallstones, acute hepatitis, due to bile metabolism disorders, there will also be symptoms of vomiting bile, the patient’s aversion to greasy food, eating greasy food will lead to diarrhea. Fourth, intestinal obstruction, because of various reasons leading to stomach contents can not be discharged, the patient will have the symptoms of vomiting, the symptoms will be reduced after stool or exhaustion.