It is wrong to say that you can tell whether it is hemorrhoids or rectal cancer by three points. To distinguish between hemorrhoids or rectal cancer, you can make a preliminary judgment based on clinical symptoms, but to ultimately clarify whether it is hemorrhoids or rectal cancer, you need to go to the hospital to receive systematic examination, so that the doctor to judge. The most common symptoms of hemorrhoids are bleeding, perianal itching, perianal pain and prolapsed hemorrhoids; the main clinical symptoms of rectal cancer are blood in the stool, changes in bowel habits and changes in stool characteristics. Hemorrhoids generally do not cause changes in bowel habits and stool characteristics, and rectal cancer generally does not cause perianal itching and prolapsed hemorrhoids. Both hemorrhoids and rectal cancer will cause blood in stool, but hemorrhoids usually bleed after stool, mostly fresh blood, the blood covers the surface of stool, and the amount is usually small; for blood in stool caused by rectal cancer, the stool will be mixed with blood, and sometimes it is manifested as black stool; if the rectal cancer is close to the anus, it may also be manifested as fresh blood in stool. The symptoms of hemorrhoids and rectal cancer have similarities, so to finally determine whether it is hemorrhoids or rectal cancer, you need to go to the hospital in time to receive systematic examination. For example, anal finger test, colonoscopy, etc. Doctors will judge according to the results of each examination. If the above discomfort occurs, you must go to the hospital in time to get a clear diagnosis as soon as possible, so that you can be treated as soon as possible.