A change in bowel habits is usually a change from 1-2 stools a day to 5-6 stools a day, or to not having a stool for several days. The change in bowel habits is also called a change in stool habits when the stools that were previously formed, long and stripy, now become unformed, or dry or bloody. If this happens, it is recommended to do a stool routine to see if there are any problems with the stool routine, whether the occult blood is positive or if there are red blood cells or white blood cells. If there is no problem with these, colonoscopy is recommended. Only colonoscopy can clarify whether the change in stool habit is caused by polyps or tumors. If there is no problem with these, colonoscopy is recommended. To avoid missed diagnosis, colonoscopy is recommended to clarify whether there are lesions in the colon before you can rest assured.