Irritable bowel syndrome commonly presents with symptoms such as abdominal pain, diarrhea, or constipation. Typically, passing mucus in stool is not a symptom of this condition. If mucus in stool occurs, it may suggest chronic colitis. A colonoscopy can be performed to confirm the diagnosis. If the colonoscopy reveals white mucus in the intestines, or signs of mucosal hyperemia, edema, or erosion, chronic colitis can be diagnosed. In terms of treatment, Western medicine primarily uses probiotics to adjust the gut flora. Chinese medicine, on the other hand, treats patients based on syndrome differentiation, using oral herbal medicine as well as external Chinese medicinal methods, which include moxibustion or herbal enemas, among others, to alleviate symptoms and treat the disease.