The blood may be visible if the tumor is near the anus however it is more common for blood to be hidden in the stool . Other things, like hemorrhoids can also cause bleeding. There are several reasons pain may occur with colon cancer. Obstruction can also cause nausea and vomiting if it is severe. Second, if the tumor grows through the wall of the colon into other organs, pain may occur, along with other symptoms, depending on the organ that is affected.
Pain can be vague and dull.
Colon cancer on the left side can cause constipation, gas pain, painful bowel movements, diarrhea, and narrowing of the stool . As people age, their risk of developing cancers such as colon cancer increases. For this reason, guidelines for cancer screening generally include age recommendations for when such tests should begin for a person of average risk. Most people who have colon cancer are over the age of 50. If you have other risk factors for colon or other cancers, you should check with your physician to determine what type of cancer screening you need.