Colon polyps often cause no symptoms. You might not know you have a polyp until your doctor finds it during an examination of your bowel.
But some people with colon polyps experience:
- Rectal bleeding. This can be a sign of colon polyps or cancer or other conditions, such as hemorrhoids or minor tears in your anus.
- Change in stool color. Blood can show up as red streaks in your stool or make stool appear black. A change in color may also be caused by foods, medications and supplements.
- Change in bowel habits. Constipation or diarrhea that lasts longer than a week may indicate the presence of a large colon polyp. But a number of other conditions can also cause changes in bowel habits.
- Pain, nausea or vomiting. A large colon polyp can partially obstruct your bowel, leading to crampy abdominal pain, nausea and vomiting.
- Iron deficiency anemia. Bleeding from polyps can occur slowly over time, without visible blood in your stool. Chronic bleeding robs your body of the iron needed to produce the substance that allows red blood cells to carry oxygen to your body (hemoglobin). The result is iron deficiency anemia, which can make you feel tired and short of breath.
When to see a doctor
See your doctor if you experience:
- Abdominal pain
- Blood in your stool
- A change in your bowel habits that lasts longer than a week
You should be screened regularly for polyps if:
Aug. 12, 2014
- You're age 50 or older.
- You have risk factors, such as a family history of colon cancer. Some high-risk individuals should begin regular screening much earlier than age 50.
- Ahnen DJ, et al. The approach to the patient with colonic polyps. http://www.uptodate.com/home. Accessed March 25, 2014.
- Feldman M, et al. Sleisenger & Fordtran's Gastrointestinal and Liver Disease: Pathophysiology, Diagnosis, Management. 9th ed. Philadelphia, Pa.: Saunders Elsevier; 2010. http://www.clinicalkey.com. Accessed March 28, 2014.
- Goldman L, et al. Goldman's Cecil Medicine. 24th ed. Philadelphia, Pa.: Saunders Elsevier; 2012. http://www.clinicalkey.com. Accessed March 27, 2014.
- AskMayoExpert. Why is surveillance of colorectal polyps important? Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2012.
- Elmunzer BJ. Endoscopic resection of sessile colon polyps. Gastroenterology. 2013;144:30.
- Baron TH, et al. Recommended intervals between screening and surveillance colonoscopies. Mayo Clinic Proceedings. 2013;88:854.
- Kennedy RD, et al. The natural history of familial adenomatous polyposis syndrome: A 24 year review of a single center experience in screening, diagnosis, and outcomes. Journal of Pediatric Surgery. 2014;49:82.
- Sharma P, et al. Advanced imaging in colonoscopy and its impact on quality. Gastrointestinal Endoscopy. 2014;79:28.
- Hegde M, et al. ACMG technical standards and guidelines for genetic testing for inherited colorectal cancer (Lynch syndrome, familial adenomatous polyposis, and MYH-associated polyposis). Genetics in Medicine. 2014;16:101.
- What I need to know about colon polyps. National Digestive Diseases Information Clearinghouse. http://digestive.niddk.nih.gov/ddiseases/pubs/colonpolyps_ez/#what. Accessed March 29, 2014.
- Ahnen DJ, et al. Colorectal cancer: Epidemiology, risk factors, and protective factors. http://www.uptodate.com/home. Accessed April 4, 2014.
- Golden AK. Decision Support System. Mayo Clinic, Rochester, Minn. March 10, 2014.