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How to recognize colon cancer symptoms 
Pay attention to blood in your stool. 
If you have ongoing rectal bleeding that doesn't seem to be a result of hemorrhoids or a tear, it's a good idea to go to the doctor and get checked out. Blood in the stool is a common symptom of colon cancer.
OPT:
 (a). It's less common if your blood flow is limited or you find multiple lesions or tissue clogging your intestines. Also: the doctor will likely check for symptoms of colon cancer in you.
 (b). Look for blood in your stool if you have vaginal bleeding. If blood in your stool is a clear result of abstinence or pregnancy, then it may not be a sign of colon cancer.
 (c). Blood can make your stool look either bright red or black. If you are not sure whether you see blood or not, be safe and contact your doctor nonetheless.
 (d). If your stool has been treated, it may have a light yellow tint on it. You may experience high blood pressure, irritable bowel syndrome, or constipation.
(c).