The stomach pain and diarrhea after drinking may be caused by irritable bowel syndrome, acute gastroenteritis, ulcerative colitis and other diseases, which need to be taken for the cause of scopolamine, montelukast, mesalazine and other medications, surgical treatment. 1. Irritable bowel syndrome: common symptoms include abdominal pain and diarrhea. Those with obvious abdominal pain need to use scopolamine, scopolamine and other anticholinergics as prescribed by the doctor, and those with severe diarrhea need to use loperamide, compound phenethylpiperidine and other antidiarrheal agents as prescribed by the doctor. 2. Acute gastroenteritis: patients will have diarrhea, abdominal pain, nausea and other symptoms. Patients should use probiotics, such as Bifidobacterium bifidum, Saccharomyces boulardii, and antidiarrheal agents such as montelukast and difenocoumarol. Antibiotics such as norfloxacin can be used for bacterial infections. 3. Ulcerative colitis: typical symptoms are abdominal pain, diarrhea with mucus, pus and blood stools. Patients need to follow the medical advice to use aminosalicylic acid preparations such as mesalazine and oxalazine, or glucocorticoids such as hydrocortisone and prednisone. For patients with ineffective drug treatment or complications such as hemorrhage, surgical treatment such as colectomy or ileal pouch anastomosis should be considered. It is recommended that patients who often have stomach pain and diarrhea after drinking go to the hospital, and cooperate with the doctor to actively treat the original disease.