Rectal cancer may not have blood in stool. If rectal cancer is very early, it usually will not cause blood in stool. Even if the rectal tumor is very large, if the tumor envelope is relatively intact and not cut by dry and hard stool, blood in stool may not occur. Therefore, rectal cancer may not always have blood in stool. In addition to blood in stool, rectal cancer may also have other symptoms such as abdominal pain, thinning of stool or change of stool habit. If the blood is only on the surface of the stool and there is no blood in the stool, it may be rectal cancer combined with hemorrhoids, which is caused by hemorrhoids and needs to be distinguished from rectal cancer blood in stool.