Inflammatory bowel disease (IBD) is an idiopathic inflammatory disease of the intestines, including ulcerative colitis and Crohn’s disease, characterized by chronic, recurrent flare-ups. It mainly involves the intestines, so stools may be mucus-pus-blood stools, or constipation alternates with diarrhea. The frequency of diarrhea varies when the severity of the disease is different, and is usually accompanied by abdominal pain and urgency. The most prominent symptom of ulcerative colitis is bloody diarrhea with blood, pus, and mucus in the stool. It occurs 2 to 4 times a day in mild cases and up to 10 to 30 times in severe cases, presenting as bloody watery stools. Crohn’s disease is characterized by abdominal pain, which may be accompanied by diarrhea in the form of pasty or watery stools, usually without pus, blood, or mucus. Sometimes diarrhea alternates with constipation and so on.