There are many reasons for vomiting when you eat, but there are three common causes: 1. esophageal diseases, occupancy of the esophagus, stenosis can cause vomiting after eating. 2. stomach diseases, mainly pyloric stenosis, pyloric obstruction caused by various reasons, can cause vomiting after eating. 3. intestinal obstruction, often accompanied by abdominal pain, poor stool or stool obstruction and other symptoms. In addition to the above main causes, there are also a number of diseases that can cause vomiting: 1, hypertension, this vomiting is often accompanied by dizziness, headache symptoms. 2, renal vomiting, mainly caused by renal insufficiency vomiting. Of course, further examination and laboratory tests are needed to confirm the clinical diagnosis.