Positive occult blood in the stool is not necessarily cancer, and cancer does not always cause positive occult blood in the stool. There are many other diseases that can also cause positive occult blood, such as the following: first, hemorrhoids. In addition to mild hemorrhoids, occult blood in the stool can also occur, and in severe cases, blood in the stool or even bleeding after the stool. Second, enteritis. Various bacterial enteritis, ulcerative colitis, etc. will appear positive fecal occult blood and abdominal pain and other symptoms. Third, blood system diseases, causing gastrointestinal bleeding, will also appear positive fecal occult blood. Fourth, bleeding from stomach and intestinal ulcers may also show positive occult blood in the stool. Therefore, positive occult blood in stool may not necessarily be cancer, and cancer may not always cause positive occult blood in stool.