Stool quadrature is mainly considered gastroenteritis, irritable bowel syndrome, anal lesions and other conditions. 1. Gastroenteritis: when patients eat unclean or poorly digested food, which leads to gastrointestinal peristalsis, they may present with discomfort such as four-square stools, abdominal pain and bloating. 2. Irritable Bowel Syndrome (IBS): when the patient is under stress and has obvious mood swings, the stools may also appear to be quadrangular. 3. Anal lesions: when the patient has hemorrhoids and anal tumors, the discharge of stool is obstructed, and the stool may also appear quadrangular. In addition, there may be other reasons for the four-square stool, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.