1 Blood in Stools

As cancer grows, it invades the wall of the colon and damages blood vessels. The blood from these damaged vessels may go into the colon and be seen when you use the toilet.

It could be for sure a sign of colon cancer if you find blood mixed with your stool. The color of blood may be bright red, dark or mixed with mucous.

A sample of this stool should be sent for analysis in a pathology laboratory. The test is known as a fecal occult blood test.

The blood might appear like drops of blood in the water, like a smear of blood on the toilet paper when you wipe, or the stools themselves may have blood on them.

Blood in stools can also be a sign of stomach cancer. Here are symptoms of stomach cancer you should never ignore.