Oddly shaped stool
The ideal shape for stool is a long, solid and cylindrical one. So, oddly shaped stool can indicate that there is an issue with the colon. For example, if the stool is small or ribbon-like, it could be an indication that the body’s waste proceeded past an obstacle or even a series of obstacles — such as polyps or tumors.
Difficult bowel movements
If going to the bathroom presents you with significant discomfort or pain, there may be a major health problem. If it’s hard to pass waste out of the body, this may be a sign that something inside the colon, such as polyps or tumors, are blocking it. If these blockages are cancerous, then your health may be threatened.
Abdominal discomfort
If this pain happens all the time, it could be a sign of colon cancer, because the discomfort can be the result of a blockage in the colon. If this blockage is the result of a cancerous tumor, then the patient could be in danger.