Drinking tea every day is not recommended for people with a weak stomach. Tea contains substances such as tea polyphenols and caffeine, which can cause the following harm to the stomach after entering the digestive system. 1. Tea polyphenols can cause irritation to the gastric mucosa, and even stimulate smooth muscle contraction and spasm, aggravating stomach pain and discomfort. 2. Lead to gastrointestinal peristalsis accelerated, a small amount of drinking can promote defecation, but a large amount of drinking, will lead to incomplete digestion of food, which is prone to diarrhea, abdominal distension and other symptoms. 3. Caffeine will stimulate the nervous system excitation, not only will lead to insomnia, but also cause gastrointestinal tract dysfunction. 4. Will lead to excessive secretion of gastric acid, aggravate gastric mucosal damage, gastric ulcer, duodenal ulcer patients is particularly obvious. So it is not recommended that people with bad stomachs drink tea every day. If you have the habit of drinking tea, you can follow the doctor’s advice in the case of moderate consumption of light tea, the most important thing is to clarify the etiology of bad stomach, after the standardized treatment.