Normal people usually defecate once a day, while some people defecate 2 to 3 times a day or once every 2 to 3 days. The characteristics of the stool are normal, and the average weight of the stool discharged daily is 150 to 200 grams, with a water content of 60% to 75%. Diarrhea is a common symptom, which means that the number of bowel movements is significantly higher than the usual frequency, the stool is thin, the water content is increased, the daily stool volume exceeds 200 grams, or contains undigested food or pus, blood, and mucus. Diarrhea is often accompanied by symptoms such as urgency to defecate, anal discomfort, and incontinence. Diarrhea is divided into acute and chronic categories. Acute diarrhea develops rapidly and the course of the disease is within 2 to 3 weeks. Chronic diarrhea refers to recurrent diarrhea with a course of more than two months or an interval of 2 to 4 weeks.