DEAR MAYO CLINIC: Last month, I had a few polyps removed during a colonoscopy. Does this mean I’m more likely to get colon cancer? My physician told me it was nothing to worry about, but I thought having a polyp meant cancer is inevitable.
ANSWER: Having colon polyps raises your risk for developing more polyps in the future. It does not necessarily make you more likely to get colon cancer. If left untreated, some colon polyps do develop into cancer, but that’s not always the case. Regular colonoscopies can help your doctor find and remove polyps when they’re small, before they cause any problems.
Colon polyps are clumps of cells that form in the lining of the colon. They grow slowly over time and typically do not cause symptoms, particularly when they are small. In time, however, some large polyps may cause bleeding into the colon. In addition, depending on where it’s located, a large polyp can also block the colon, leading to problems such as abdominal pain, severe constipation, nausea and vomiting.
Polyps are most common in people older than 50, and may be more common in smokers, people who are overweight and those who eat a low-fiber, high-fat diet. People with a family history of colon polyps are also more likely to get polyps than those who do not have the same history.
Small colon polyps are harmless. But over time, some do grow and become cancerous. There’s no way to tell the difference between polyps that will turn into colon cancer and polyps that won’t by simply looking at them. The polyps need to be removed and analyzed under a microscope in a laboratory. If your doctor told you that the polyps removed from your colon were not worrisome, it’s likely that they were removed early, before they had a chance to grow and become cancerous.