If you have a bad stomach, you can drink tea. Currently, research has found that black tea extract has an anti ulcer effect and promotes healing of ulcers caused by drugs such as aspirin and alcohol. At the same time, tea extracts can also regulate gastric acid secretion and enhance gastric motility. Moreover, black tea, green tea, and Pu'er tea all have certain antibacterial effects. Drinking black tea can reduce harmful bacteria in the digestive tract, prevent diarrhea, and reduce colon structural damage. However, different people may be suitable for different teas. Black tea may be suitable for those with weak gastrointestinal function or digestive tract damage, while green tea has strong antibacterial and anti-inflammatory effects, can control blood lipids, and may be more suitable for those with strong appetite and digestive function.