Symptomatic, supportive and even surgical treatments based on a clear understanding of the cause of the stomach pain and diarrhea can provide the fastest relief. Stomach pain and diarrhea can be caused by a variety of causes, such as common viral diarrhea, bacterial diarrhea, ulcerative colitis, irritable bowel syndrome and so on. 1. Viral diarrhea: It can be triggered by common rotavirus, norovirus, enteric adenovirus. It can be treated with medications such as montelukast powder or eliminacadotril. Probiotics can also be used to improve the balance of intestinal flora to stop diarrhea. 2. Bacterial infectious diarrhea: It can be triggered by common bacteria such as Escherichia coli. Bacterial infectious diarrhea is more serious than viral infectious diarrhea, and can be treated with antibiotics and antidiarrheal drugs. 3. Ulcerative colitis: It is a kind of chronic colitis, which can lead to abdominal pain, diarrhea, mucus, pus and blood stool. The most commonly used medications are mesalazine and sulfasalazine. 4. Irritable Bowel Syndrome (IBS): patients present with abdominal pain, accompanied by diarrhea, unformed stools, constipation, abnormal bowel process and other manifestations. Drugs are mainly symptomatic treatment, through antispasmodic drugs, antidiarrheal drugs, etc. to improve symptoms. If the symptoms continue to be unrelieved, it is recommended to consult a doctor in a timely manner, under the guidance of a doctor to determine the cause of the disease and targeted treatment, do not take medication on their own, so as not to delay the condition.