Colon Polyps and Colon Cancer Screening: Start at 45
Colon cancer is one of the most common cancers in the United States, and it is increasingly found in adults under 50. Most colon cancers start as small growths called polyps. Finding and removing polyps prevents cancer, which is why screening matters even when you feel fine.
What are colon polyps?
Polyps are small growths on the inner lining of the colon. Most cause no symptoms. Some types, called adenomas and sessile serrated polyps, can slowly turn into cancer over several years. During a colonoscopy we remove polyps on the spot and send them to the lab.
When to start screening
- Age 45 for adults at average risk
- Earlier if a parent, brother, sister, or child had colon cancer or advanced polyps (often at 40, or 10 years before the youngest relative's diagnosis)
- Earlier and more often if you have ulcerative colitis or Crohn's disease of the colon, or a known inherited syndrome
Screening options
- Colonoscopy every 10 years if normal. It is the only test that finds and removes polyps in the same visit.
- FIT stool test every year
- Stool DNA test (such as Cologuard) every 1 to 3 years
- CT colonography every 5 years
If a stool test or CT is abnormal, you need a colonoscopy to finish the screening.
Symptoms that need attention now
Don't wait for screening if you have rectal bleeding, a change in bowel habits, unexplained weight loss, or anemia.
Getting screened with us
Many healthy adults can book through our direct access colonoscopy program without a pre-procedure visit. Colonoscopies are performed at Valley Digestive Health Center and USC Arcadia Hospital, under sedation. Prep instructions are available in English, Spanish, Vietnamese, and Chinese. Learn more about what to expect during colonoscopy.
Make an appointment
Our gastroenterologists in Temple City care for patients from Arcadia, San Gabriel, Pasadena, Monrovia, Monterey Park, and across the San Gabriel Valley. We accept most PPO plans (see accepted insurances), and our doctors speak English, Vietnamese, and Mandarin. Schedule an appointment or call 626-898-4560.
This article is for general education and is not a substitute for medical advice. Talk with your doctor about your own health.
Quick Answers
At what age should I start colon cancer screening?
Most adults at average risk should start at age 45. People with a family history of colon cancer or advanced polyps, or with inflammatory bowel disease, may need to start earlier.
How often do I need a colonoscopy?
If your colonoscopy is normal and you are at average risk, usually every 10 years. If polyps are found, your doctor may recommend a shorter interval.
Can I schedule a colonoscopy without an office visit?
Many healthy adults can, through our direct access colonoscopy program.
