Pyloric obstruction vomiting is more distinctive, mainly vomiting of overnight lodged food and with a sour odor. There are four major complications of gastric ulcers and pyloric obstruction is one of them, especially pyloric duct gastric ulcers, which can cause pyloric duct stenosis. If there is an ulcer at the exit of the stomach, the scar will slowly form after the hyperplasia, forming a pyloric stenosis, the exit is not smooth, the food is accumulated in the stomach, the stomach volume support is about 1000ml, if you eat too much, the volume of the stomach to 1000ml can not be tolerated after, vomiting will occur. If you eat too fast, very early to reach the volume, will be jet vomiting. In general, in the stomach after the neutralization of stomach acid fermentation, and then vomiting is the overnight food, there is a sour smell, and the next day vomiting is more common, so the vomiting characteristics are mainly sour smell and overnight food.