Hemorrhoids are soft tissues, a kind of anal cushion downward movement, will not cause the stool to become thin. The causes of thin stools are mainly the following: it may be caused by anal fissures, the patient’s long-term repeated anal fissures are likely to cause the formation of local mucosal tissue scarring and contracture, no more elasticity and thus easily lead to narrowing of the anus and thinning of the shape of defecation. The main manifestation of rectal cancer is the prominent cauliflower-like growth with hard texture, and in more serious cases, the surface will easily break down and mucus-pus-blood stool will appear, and in mild cases, the stool will become thinner with positive fecal occult blood, and the systemic manifestation is weight loss, which can be detected early by anal finger examination. In addition, people over 40 years old need to have regular colonoscopy, which can effectively screen for rectal and colon cancers.