Diarrhea is a relatively common disease in daily life, called “diarrhea”, the main symptoms are a significant increase in the number of bowel movements, thin stools, abdominal pain and other manifestations. It can be divided into acute diarrhea and chronic diarrhea. Acute diarrhea has an acute onset and lasts for 2-3 weeks, with the number of bowel movements significantly exceeding the normal frequency, which can reach dozens of times in severe cases. The stool may contain pus and blood or mucus, watery or dysentery-like discharge, and there is often a sense of urgency, anal discomfort or even fecal incontinence during defecation. Chronic diarrhea is a long-term persistent disease with a long duration or short intervals and recurrent episodes, with a significant increase in the number of stools, watery stools, stools containing pus and blood or mucus, and a feeling of urgency and heaviness, and the duration of the disease can last more than two months. Chronic diarrhea can indirectly indicate the presence of chronic diseases, such as chronic dysentery, rectal cancer, ulcerative colitis and other diseases. Depending on the cause, it may be accompanied by abdominal pain, fever, weight loss, abdominal masses, etc. The clinical manifestations of diarrhea may vary according to different causes in different populations, so it is necessary to combine various factors for comprehensive diagnosis and careful differentiation.