Vomiting after a meal, which is fine afterward, is commonly caused by two reasons: First, the cardia is relaxed. The cardia is the upper opening of the stomach, and when it is relaxed, the contents of the stomach will easily reflux and be vomited out. This is especially true after eating, or if you eat a large amount of food. The second type, narrowing of the pylorus. The pylorus is the lower opening of the stomach, which is often narrowed due to inflammation, ulcers, or even space-occupying lesions, which prevents the contents of the stomach from traveling downward, especially after eating, leading to nausea and vomiting. It is recommended to do a gastroscopy to see if these two causes are present, and if neither of these causes is present, then further clinical other tests should be done.