A granular bowel movement is usually referred to as constipation. There are many causes of constipation, including functional constipation, congenital megacolon and anal fissure. 1. Functional constipation: bad defecation habits (such as inhibiting the urge to defecate, too long toilet time, defecation attention is not focused, etc.), bad dietary habits (such as food in the dietary fiber content is too small, less water, etc.) and poor living habits (often sedentary or bedridden, etc.) can cause constipation. 2. Congenital megacolon: caused by intestinal neuron deficiency, mostly seen in the sigmoid colon and rectum. It is characterized by persistent constipation, manifested by granular stools, mostly accompanied by abdominal distension, vomiting and other symptoms. 3. Anal fissure: due to the pain caused by defecation, patients are often reluctant to defecate, feces in the intestines for too long, resulting in feces in the water is absorbed, stools become dry, resulting in granular stools. Constipation may also be related to other causes, such as hemorrhoids, etc. If the symptoms continue to be unrelieved through lifestyle changes, you should go to the hospital as soon as possible, and under the guidance of a professional physician to clarify the cause of the disease, and then carry out standardized treatment.