Many of the symptoms of colon cancer are also symptoms of other diseases of the colon. It is very important to see your doctor if you are having any of the following symptoms, so the proper tests can be run to make a correct diagnosis. 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.