Stools in patients with irritable bowel syndrome are usually free of pus. Irritable bowel syndrome is a common functional bowel disease, and the main clinical manifestations are abdominal pain, changes in bowel habits, and changes in fecal character. Diarrhea-type irritable bowel syndrome is characterized by rapid defecation, pasty or watery stools, mucus, but no pus or blood, and alternating diarrhea and constipation in some patients. Constipation type of irritable bowel syndrome is often manifested as difficult to defecate, the feces is dry, small amount, in the form of goat feces or thin rod, the surface may be attached mucus. Patients with irritable bowel syndrome usually do not have pus in the stool. If pus is present in the stool, it is recommended to consult a doctor to clarify the cause of the disease and to carry out targeted treatment or therapy under the guidance of the doctor.