Constipation, diarrhea, and abdominal pain can all be symptoms of colorectal cancer.   

But they can also be signs of other conditions, including Crohn’s disease, irritable bowel syndrome and even a stomach virus.  

So, how do you know when it’s time to see a doctor?  

“Any time symptoms persist for longer than two weeks, they are cause for concern,” says gastroenterologist David Richards, M.D. “That...