Colon Stricture

Overview

A colon stricture is a place where part of your colon (your large bowel) becomes narrower than it should be. Your colon is the tube that carries waste from your small intestine down to your rectum, so when the tube narrows, stool has a harder time getting past. Some strictures are short and mild and cause few problems. Others are longer or tighter and can partly block the bowel. A stricture is not a disease on its own. It is a sign that something else is going on, such as inflammation, scar tissue, or, less often, a growth. That is why doctors always look for the underlying cause.

Colon strictures are not common in the general population. They are seen much more often in people who already have a bowel condition, such as inflammatory bowel disease or diverticular disease, or who have had surgery or radiotherapy in the belly area.

Strictures can affect people of any age, but who gets them depends on the cause. Younger adults with inflammatory bowel disease are one group. Older adults are more likely to have strictures linked to diverticular disease, a reduced blood supply to the bowel, or a growth in the colon. In children, strictures are rare and usually linked to a birth difference in the bowel or scarring after a serious bowel illness in infancy.

Symptoms

Common symptoms

• A change in bowel habit that lasts more than a few weeks, especially constipation that slowly gets worse
• Stools that look thin, like a pencil or a ribbon
• Cramping belly pain that comes in waves and may ease after passing stool or wind
• Bloating and a feeling of fullness
• Passing a lot of wind, or loud gurgling sounds from the belly
• A feeling that you have not fully emptied your bowel
• Loose stools or watery leakage past a hard, narrow spot (some people get this instead of constipation)
• Blood or mucus in your stool
• Losing weight without trying
• Feeling sick, or vomiting if the narrowing is tight

Symptoms in children

• Severe or lasting constipation that is hard to treat
• A swollen, uncomfortable belly
• Vomiting, especially after feeds in babies
• Poor feeding and slow weight gain, or slower growth than expected
• Liquid stool leaking around a hard blockage
• In some babies, a stricture is found because meconium (the first dark stool) is slow to pass

Symptoms in older adults

• Constipation that is new or getting worse, even if you have never had bowel trouble before
• Thin stools, or a mix of constipation and loose stools
• Vague belly discomfort rather than sharp pain
• Tiredness or shortness of breath from anaemia (low iron in the blood), which can be a sign of slow blood loss
• Weight loss and a general drop in appetite
• Symptoms that come on more quickly if the blood supply to the bowel is the cause

Causes

Main causes

• Inflammation and scarring from inflammatory bowel disease, such as Crohn's disease or ulcerative colitis
• Diverticular disease: small pouches in the bowel wall that can become inflamed and then heal with scar tissue
• Scar tissue after bowel surgery, especially surgery that joined two ends of bowel together
• Scar tissue after radiotherapy to the belly or pelvis
• Reduced blood supply to part of the bowel, which damages the tissue and heals with narrowing
• A growth or tumour in the colon wall, which is why any stricture needs to be checked properly
• Less common causes such as endometriosis affecting the bowel, long-term use of some enemas or suppositories, or a birth difference in the bowel

Risk factors

• Having Crohn's disease or ulcerative colitis, especially for many years
• Having had diverticulitis more than once
• Previous surgery on the bowel, or surgery that re-joined two sections of bowel
• Previous radiotherapy to the tummy or pelvis
• A family history of bowel cancer, or a personal history of colon polyps
• Long-standing inflammation in the colon that has not been well controlled
• Smoking, a diet low in fibre, and low levels of physical activity, which raise the risk of diverticular disease and bowel cancer

When to see a doctor

See a doctor urgently if:

• You cannot pass stool or wind and your belly is swollen and painful
• You keep vomiting or cannot keep fluids down
• There is blood in your stool, or your stool is black and tarry
• You have severe belly pain with a fever
• You feel faint, very dizzy, or your heart is racing

Book a routine appointment if:

• Your bowel habit has changed and has not settled after a few weeks
• Your stools are regularly thin or ribbon-like
• You have belly cramps or bloating that keeps coming back
• You are losing weight without trying
• You have anaemia or low iron levels found on a blood test
• You have a long-term bowel condition and your symptoms are changing

Diagnosis

Your doctor will start by asking about your symptoms, your bowel habits, your medical history, and any medicines you take. They will examine your tummy and may do a rectal exam, where a gloved finger checks the lower rectum. If a stricture is suspected, you will usually be referred for a camera test of the colon or a scan. The aim is twofold: to find the narrowing and to work out what is causing it.

Tests that may be done

• Colonoscopy: a thin, flexible tube with a camera checks the inside of the colon and can take a small tissue sample (biopsy)
• CT scan of the tummy and pelvis, which shows the shape of the bowel and the area around it
• CT colonography (a virtual colon scan), which can show narrowing without passing a camera
• Barium enema: an X-ray test using a chalky liquid to outline the colon; used less often now
• MRI scan, which is useful for looking at the bowel wall, nearby tissues, and the pelvis
• Blood tests to check for anaemia, inflammation, and how well your kidneys are working
• Stool tests to look for infection or inflammation
• A biopsy, where a tiny piece of tissue is checked in a lab to see whether the cause is inflammation, scarring, or a growth

What to expect at your appointment

You may feel a little anxious about these tests, which is completely normal. A colonoscopy usually involves bowel preparation the day before and sedation so you are comfortable. Most people go home the same day. Scans are quick and painless, though you may be asked to drink a special liquid or have a small injection beforehand. Results are not always ready on the day, because biopsy samples need time in the lab. Ask your care team when to expect your results and who will explain them to you.

Treatment

Treatment depends on what is causing the stricture, how tight it is, and how much it is affecting you. The first goal is to treat the underlying condition, whether that is inflammation, infection, or something else. The second goal is to keep stool moving safely. Some people need only monitoring and diet changes. Others need a procedure to widen the narrowing or surgery to remove that section of bowel.

Self-care at home

• Keep a simple diary of your bowel habits, symptoms, and what you eat, so you can spot patterns and share them with your doctor
• Drink enough fluid through the day, and sip regularly rather than all at once
• Follow any diet plan your care team gives you; during a flare, a softer, lower-fibre diet may be suggested for a while
• Chew food well and eat smaller meals more often if big meals make you uncomfortable
• Stay gently active, such as short daily walks, which helps the bowel keep moving
• Do not take laxatives or fibre supplements without checking with your doctor or pharmacist, because some can make a tight stricture worse
• Go to your follow-up appointments even when you feel well, so any change is caught early

Medical treatments

Your doctor will first treat the cause. If inflammation is behind the stricture, they may prescribe medicines that calm inflammation, given as tablets, injections, or suppositories. If infection is involved, such as in diverticulitis, antibiotics may be needed. Some narrowings can be stretched during a colonoscopy using a small balloon, sometimes with a temporary mesh tube (a stent) to hold the bowel open; this can be repeated if the narrowing returns. Your care team may also suggest a dietitian to help you get enough nutrition while the bowel settles. Any medicine should only be started, changed, or stopped with your doctor or pharmacist, because the right choice depends on your exact cause and history.

When is surgery considered?

Surgery may be suggested when a stricture is very tight, keeps coming back after stretching, does not respond to treatment, or when the cause needs to be removed, such as a growth. The most common operation removes the narrowed section and joins the healthy ends back together. Some people need a temporary stoma (an opening on the tummy for stool to leave the body) while the bowel heals. Your surgeon will explain the risks, benefits, and what recovery looks like, so you can decide together.

Living with this condition

Many people live well with a colon stricture, especially once the cause is treated and a plan is in place. Day to day, it helps to know your own warning signs and to have a simple routine. Some people find their symptoms come in waves, with good stretches in between. Planning ahead, such as knowing where toilets are when you go out, can make a real difference to your confidence.

Lifestyle tips

• Eat regular meals and notice which foods seem to trigger cramps or bloating
• Keep a bottle of water with you and sip through the day
• Build gentle movement into your routine, like walking or swimming
• Avoid smoking, and limit alcohol if it upsets your bowel
• Get enough sleep, since tiredness can make bowel symptoms feel harder to manage
• Keep a small bag with spare underwear, wipes, and any prescribed items when you travel
• Write down questions before appointments so you do not forget them

Diet and exercise

There is no single diet that suits everyone with a stricture, so a dietitian can help you find what works for you. During a flare or when symptoms are bad, softer foods and lower-fibre choices may be easier to pass, and your team may ask you to avoid tough skins, seeds, and stringy vegetables for a while. When things are calm, a balanced diet with fibre is usually good for long-term bowel health, but build it up slowly. Drink enough to keep stools soft but not watery. Exercise helps the bowel keep moving and supports your mood. Aim for movement you enjoy, and build up gradually rather than all at once.

Mental health and emotional wellbeing

Bowel problems can be tiring and can affect your mood, your work, your relationships, and your confidence. Feeling worried before a test, or frustrated by symptoms that come and go, is very normal. If low mood, anxiety, or embarrassment is building up, please tell someone. Speak to your doctor, who can arrange support, and remember that help is available. If you ever feel you cannot cope or are having thoughts of harming yourself, contact your local crisis line or emergency services straight away, or reach out to someone you trust and stay with them until help arrives.

Prevention

Not every stricture can be prevented, especially those caused by a birth difference, radiotherapy, or an inherited condition. But some causes can be lowered. Keeping long-term bowel inflammation well controlled, treating diverticulitis promptly, and not smoking all help reduce the risk of scar tissue forming. Eating a balanced diet, staying active, and drinking enough fluid also support good bowel health.

Screening programmes

Because a growth in the colon is one possible cause, bowel cancer screening matters. Many countries, including the UK, offer regular bowel screening to people in a certain age range, often using a simple stool test sent by post, with a camera test offered if the result is abnormal. If you have a long-term bowel condition or a strong family history of bowel cancer, you may be offered earlier or more frequent checks. Ask your doctor what screening applies to you and when you are next due.

Complications

If left untreated

• Bowel obstruction, where stool and wind cannot pass and the belly becomes swollen and painful
• A hole (perforation) in the bowel wall, which lets bowel contents leak and causes serious infection
• Dehydration and poor nutrition from vomiting or from not being able to eat properly
• A hard build-up of stool (impaction) that is difficult to clear
• Ongoing blood loss leading to anaemia and tiredness
• If a growth is the cause, it may grow or spread the longer it goes unchecked

Long-term outlook

The outlook is generally good, especially when the cause is found and treated early. Many strictures stay stable for years with monitoring and simple changes. If a procedure or surgery is needed, most people recover well and get back to normal life, though it can take time and some people need ongoing follow-up. Your care team will help you plan what to watch for and when to come back, so you feel confident about managing things day to day.

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