As we know, tea and coffee have a refreshing effect on the brain, and are 2 of the most popular drinks in the world. Tea and coffee contain theophylline and caffeine, which can excite the central nervous system, stimulate the heart muscle, and have a relaxing smooth muscle and diuretic effect. And what effect do they have on the stomach? Experimental studies have shown that caffeine-like substances can stimulate the glands of the stomach, so that the secretion of gastric acid and pepsin and other digestive juices increase. When the stomach is damaged for various reasons, there are various pathologies such as gastritis, gastric ulcer, strong tea and strong coffee cause increased secretion of gastric acid, which can directly aggravate gastric disease and reduce the effectiveness of gastric drugs. Therefore, we say that strong tea and strong coffee are stimulating to the stomach and should be avoided when gastric disease occurs.