The exact cause of colon polyps is unknown. Some experts believe a high-fat, low-fiber diet can be a predisposition to polyp formation. There may be a genetic risk to develop polyps as well.
 

1. Being older than 50.
2. A family history of colon polyps or colon cancer increases the risk of polyps.
3. Patients with a personal history of polyps or colon cancer are at risk of developing new polyps.
4. There are some rare polyp or cancer syndromes that run in families and increase the risk of polyps occurring at younger ages.

There are two common types:

1. Hyperplastic polyp. The hyperplastic polyp is not at risk for cancer and, therefore, is not as significant.
2. Adenoma. The adenoma is thought to be the precursor (origin) for almost all colon cancers, although most adenomas never become cancers. Although it is impossible to tell which adenomatous polyps will become cancers, larger polyps are more likely to become cancers and some of the largest ones (those larger than 1 inch) can already contain small areas of cancer.

A biopsy (or small piece of removed tissue) is the only way to differentiate between hyperplastic and adenomatous polyps. Because your doctor cannot be certain of the tissue type by the polyp’s appearance, doctors generally recommend removing all but the smallest polyps.
 

Most colon polyps cause no symptoms. Larger ones can cause blood in the stools, but even they are usually asymptomatic. Therefore, the best way to detect polyps is by screening individuals with no symptoms.

Several other screening techniques are available: testing stool specimens for traces of blood, performing sigmoidoscopy to look into the lower third of the colon, or using a radiology test such as a barium enema. If one of these tests finds or suspects polyps, your doctor will generally recommend colonoscopy to remove them. Because colonoscopy is the most accurate way to detect polyps, many experts now recommend colonoscopy as a screening method so that any polyps found or suspected can be removed during the same procedure.
 

Most polyps found during colonoscopy can be completely removed during the procedure. Various removal techniques are available; most involve severing them with a wire loop and/or burning the polyp base with an electric current. This is called polyp resection. Because the bowel lining is not sensitive to cutting or burning, polyp resection does not cause discomfort. Resected polyps are then examined under a microscope to determine the tissue type and to detect any cancer.
 
What are the risks of colon polyp removal?
Colon polyp removal (or polypectomy) during colonoscopy is a routine outpatient procedure. Possible complications, which are uncommon, include bleeding from the polypectomy site and perforation (a hole) of the colon. Bleeding from the polypectomy site can be immediate or delayed for several days; persistent bleeding can almost always be stopped by treatment during colonoscopy. Perforations usually require surgery to repair.
 
How often do I need a colonoscopy if have polyps removed?
Your doctor will decide when your next colonoscopy is necessary. The timing depends on several factors, including the number and size of polyps removed, the polyps’ tissue type and the quality of the colon cleansing for your previous procedure. The quality of cleansing affects your doctor’s ability to see the surface of the colon. If the polyps were small and the entire colon was well seen during your colonoscopy, doctors generally recommend a repeat colonoscopy in one to three years. If your repeat colonoscopy does not show any indication of polyps, you might not need another procedure for an additional within five years. However, if the polyps were large and flat, your doctor might recommend an interval of only months before a repeat colonoscopy to assure complete polyp removal. Your doctor will discuss those options with you.