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A colonoscopy is a medical procedure that allows a doctor to examine the inner lining of the large intestine and rectum. This diagnostic procedure involves using a colonoscope, a flexible tube equipped with a camera and light. A colonoscope allows physicians to identify abnormalities such as polyps, inflammation, or signs of colorectal cancer. Colonoscopies are a component of preventive healthcare, and they are often performed as part of routine screening to detect potential issues early. Here is more information about colonoscopies and what happens during them:
Explaining a Colonoscopy
A colonoscopy detects colon cancer, polyps, inflammation, and sources of bleeding. Doctors may also use it to investigate ongoing digestive symptoms. When a physician identifies early signs of colon cancer, they may be able to cure it. Early detection of colon cancer enables doctors to remove cancerous polyps before they become more serious. Colon cancer grows slowly, and removing precancerous polyps stops the disease before it starts. Because other symptoms rarely appear in the early stages, regular screening gives doctors a chance to act while the cancer remains treatable.
Preparing for a Colonoscopy
Preparation clears the colon, and a clean colon lets the doctor see clearly. Your physician will prescribe a special diet and a liquid solution that empties the bowel, and you typically begin this routine the day before your appointment. The instructions are strict to help make the exam accurate.
Follow your doctor’s directions closely, since leftover residue in the colon can hide polyps or other changes. When the colon is not fully clean, the doctor may need to repeat the procedure, and that means more preparation later. Careful prep helps your chances of receiving clear results.
Common preparation steps include:
- Eating a low-fiber diet for two or three days
- Switching to a clear liquid diet the day before
- Drinking the prescribed bowel-cleansing solution
- Stopping certain medications when your doctor advises it
Understanding the Procedure
A doctor uses a colonoscope during the exam, and this thin, flexible tube has a small camera at its tip. You receive sedation first, which helps you stay calm throughout the procedure. The doctor gently guides the scope through the colon. The camera sends live images to a screen.
While viewing the colon, the doctor looks for polyps, inflamed tissue, and signs of disease. If polyps appear, the doctor can remove them right away, and the tissue then goes to a lab for testing. By removing suspicious polyps, the doctor performs the treatment and screening simultaneously.
Here are some other items a doctor looks for during a colonoscopy:
- Areas of inflamed or irritated tissue, possibly signaling inflammation or infection.
- Ulcers or sores within the colon lining.
- Signs of bleeding, which may point to underlying issues such as ulcers or tumors.
- Narrowing or strictures in the colon, which can suggest blockages or other structural abnormalities.
- Unusual discoloration or texture changes in the colon lining.
- Evidence of diverticulosis or small pouches formed in the colon walls.
- Any visible indications of tumors or masses that require further investigation.
Recovering and Re-screening
Recovery is usually short, but the effects of the sedation can linger for a while. Most people rest for an hour after the exam. A friend or family member should drive you home. You can return to normal eating once the sedation wears off, though mild bloating sometimes lasts a few hours.
Most adults get a colonoscopy every 10 years starting at age 45, and your doctor may suggest a shorter interval if you have risk factors. When polyps are found, the next screening usually comes sooner, since closer monitoring catches new growths early. Your physician will help you set a schedule to fit your health history.
Learn More About Colonoscopy
A colonoscopy examines the large intestine, and it lets doctors treat problems during the same visit. Good preparation makes the exam accurate. If you want to learn more about colonoscopy and the benefits of regular screenings, consult a healthcare provider near you.
