Drinking green tea stomach pain upset stomach, may be caused by gastrointestinal flora disorders, may also be itself suffering from chronic gastritis, peptic ulcer and other diseases caused by the different causes of general treatment, bifidobacteria, Ranitidine, Reba Pate and other drug therapy or conservative treatment. 1. Gastrointestinal disorders: If you drink too much green tea at one time, it may cause irritation and lead to gastrointestinal disorders. It is necessary to stop drinking tea, and then take oral probiotics to regulate the intestinal tract, such as Bifidobacterium triphylium and so on. 2. Chronic gastritis: it is due to the gastric mucosa stimulated by inflammation, drinking green tea during the period of illness may aggravate the irritant reaction, thus causing diarrhea and abdominal pain. At present, it is necessary to improve dietary habits in a timely manner to reduce the irritant reaction. For patients with Helicobacter pylori, a combination of drugs is needed, such as omeprazole + clarithromycin + amoxicillin + bismuth potassium citrate. 3. Peptic ulcer: it is caused by ulceration of the gastrointestinal mucosa, and drinking tea during this period will aggravate gastrointestinal discomfort, thus causing diarrhea and abdominal pain. Those who have gastric acid reaction can take oral ranitidine, famotidine to inhibit gastric acid, and combine with Rebapatide, teprenone and other drugs to protect the gastric mucosa. If you have stomach pain and diarrhea after drinking green tea, it is recommended that you seek medical attention in a timely manner and clarify the cause of the problem through gastroenteroscopy and routine stool examination before proceeding with formal treatment.