Colonoscopy procedure day

Overview

A colonoscopy is a test that lets a doctor look inside your large bowel (colon) using a long, flexible tube with a tiny camera at the end. The procedure usually takes about 30–60 minutes and is done while you are sedated (given medicine to make you relaxed and sleepy). On the day of the procedure, you will arrive at the hospital or clinic, be checked in, and then have the colonoscopy. Afterward, you rest in a recovery area until the sedation wears off.

Yes, colonoscopy is a common procedure, especially for people over 50 as part of bowel cancer screening, or for anyone with bowel symptoms.

It is used for adults of any age who have bowel symptoms (like bleeding or change in bowel habits) or as a routine screening test for bowel cancer, typically starting at age 50–60 depending on guidelines.

Symptoms

Common symptoms

• The procedure itself is not a symptom – but it is done because of symptoms like blood in stool, persistent diarrhoea or constipation, unexplained weight loss, or as a screening test.

Symptoms in children

• Colonoscopy is rare in children, but may be done for severe symptoms like chronic diarrhoea, bleeding, or suspected inflammatory bowel disease. Children receive special care and a paediatric team.

Symptoms in older adults

• Older adults may be more likely to have polyps or bowel cancer, so colonoscopy is common. They may need extra care with sedation and recovery due to other health conditions.

Causes

Main causes

• A colonoscopy is not a disease; it is a test. It is performed to find the cause of bowel symptoms or to screen for bowel cancer.
• Common reasons include: blood in stool, change in bowel habits, unexplained abdominal pain, or a family history of bowel cancer.

Risk factors

• Having a close relative with bowel cancer
• Being over 50 (age is a main risk factor for polyps and bowel cancer)
• Having a personal history of polyps or inflammatory bowel disease (like Crohn's or ulcerative colitis)

When to see a doctor

See a doctor urgently if:

• Any rectal bleeding that is more than a few spots
• Sudden change in bowel habits lasting more than a few weeks
• Severe abdominal pain

Book a routine appointment if:

• If you are due for bowel cancer screening (usually between ages 50 and 74 in the UK)
• If you have ongoing but mild bowel symptoms like occasional blood or changes in your stool
• If you have a family history of bowel cancer and have not been screened

Diagnosis

A colonoscopy is both a diagnostic test and a treatment tool. During the procedure, the doctor can see the lining of your colon and can remove polyps or take tissue samples (biopsies) if needed.

Tests that may be done

• Bowel preparation (laxatives and clear liquid diet) the day before
• Sedation given through a small tube in your arm
• The colonoscope is gently inserted into the back passage and moved around the colon
• If polyps are found, they are usually removed during the same procedure

What to expect at your appointment

On the day of the colonoscopy, you will check in at the hospital or clinic. A nurse will take your details and start an IV line for sedation. You will be asked to change into a hospital gown and lie on your side. The doctor will insert the scope, and you may feel some pressure or cramping but not severe pain. Most people sleep through the procedure. Afterward, you rest in a recovery area for about an hour. You may feel bloated or have mild cramping from air used to inflate the bowel – this is normal and passes quickly. You will be given instructions about what to eat and when to resume normal activities.

Treatment

The colonoscopy itself is not a treatment for a disease, but it can be part of treatment if polyps are found. Removing polyps (polypectomy) can prevent them from turning into cancer. If cancer is found, further treatment will be needed.

Self-care at home

• After the procedure, rest for the remainder of the day – do not drive, operate machinery, or make important decisions because of the sedation.
• Drink plenty of fluids and eat light meals if you feel up to it. Your bowel movements may be irregular for a day or two.
• If you had polyps removed, your doctor may advise avoiding heavy lifting or strenuous exercise for a few days.

Medical treatments

If polyps are found and removed, no further treatment may be needed, but you will have follow-up colonoscopies in the future (usually in 1 to 10 years depending on the number and type of polyps). If a biopsy shows cancer, you will be referred to a cancer specialist who will explain treatment options, which may include surgery, chemotherapy, or radiation – this is a separate process from the colonoscopy.

When is surgery considered?

If colonoscopy finds a large polyp that cannot be removed safely during the procedure, or if cancer is diagnosed, surgery to remove part of the colon may be needed. Your doctor will discuss all options with you.

Living with this condition

After a colonoscopy, most people return to normal life the next day. If polyps were removed, you may have minor bleeding when you have a bowel movement for a day or two, which is normal. Follow your doctor’s advice about when to resume your regular diet and activities.

Lifestyle tips

• Eat a diet high in fibre (fruits, vegetables, whole grains) to help keep your bowel healthy.
• Stay active – regular exercise may reduce your risk of bowel cancer.
• Limit red and processed meats, and avoid smoking and heavy alcohol use.

Diet and exercise

After a colonoscopy, start with light foods like soup, crackers, and toast. Avoid heavy, greasy, or spicy foods for the first day. Drink plenty of water. Resume normal eating when you feel ready. Gentle walking is fine, but avoid vigorous exercise for 24 hours if you had sedation or polyps removed.

Mental health and emotional wellbeing

Waiting for colonoscopy results can be stressful. Many people worry about cancer. It is normal to feel anxious. Talk to your doctor or nurse about your concerns. Remember that most polyps are not cancer, and even if cancer is found, early treatment is very effective.

Prevention

Bowel polyps and cancer can be prevented or caught early with regular screening. A healthy diet, exercise, not smoking, and limiting alcohol may reduce your risk. Colonoscopy is one of the best ways to prevent bowel cancer by removing polyps before they turn into cancer.

Screening programmes

In the UK, the NHS offers bowel cancer screening to everyone aged 50 to 74 every two years using a home test kit (FIT). If the test is positive, you may be offered a colonoscopy. Some people with a strong family history may be offered colonoscopy earlier.

Complications

If left untreated

• If polyps are left, they can sometimes grow and become cancer over many years.
• Undiagnosed bowel cancer can spread and become harder to treat.

Long-term outlook

Bowel cancer is one of the most treatable cancers when found early. The outlook after a colonoscopy is usually very good – most people have no problems, and if polyps are removed, the risk of cancer drops dramatically. Even if cancer is found, modern treatments are effective, and many people are cured.

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