What is crohn's disease?
Crohn's disease is a form of inflammatory bowel disease (IBD) in which the immune system causes patchy, deep inflammation anywhere along the digestive tract, most often the end of the small bowel and the colon. It typically follows a relapsing-remitting course: flare-ups of pain, diarrhoea and fatigue separated by quieter periods. Over time it can cause narrowing, abscesses or fistulas that sometimes need surgery.
Crohn's most often starts between the ages of 15 and 35, affects men and women equally, and arises from a mix of genetic susceptibility, immune dysfunction and environmental factors; smoking notably worsens it. Diagnosis combines blood tests, the stool marker faecal calprotectin, colonoscopy with biopsies, and MRI scans of the small bowel to map how much gut is involved.
Common symptoms
- Abdominal pain, often in the lower right side
- Persistent or recurrent diarrhoea, sometimes with blood
- Profound fatigue
- Weight loss and reduced appetite
- Mouth ulcers
- Problems around the anus such as abscesses or fistulas
- Joint pains, eye inflammation or skin problems during flares
How long will you wait?
Routine NHS gastroenterology referrals for suspected IBD commonly take two to four months to reach clinic and colonoscopy, though suspected severe cases are prioritised and flares are seen urgently.
Privately, you can typically see a consultant within 3–7 days, with colonoscopy and MRI usually completed within 1–2 weeks so treatment can start promptly.
NHS England median referral-to-treatment wait: 12.4 weeks, with 2.5 million people waiting over 18 weeks (May 2026). Individual waits vary by trust and urgency.
Treatment options
- Steroids for flares. Short courses of corticosteroids settle acute inflammation but are not used for long-term control.
- Immunomodulators. Drugs such as azathioprine or methotrexate damp the immune response to maintain remission.
- Biologic and small-molecule therapy. Targeted drugs such as anti-TNF agents, ustekinumab and newer oral therapies control moderate to severe disease.
- Surgery. Removing a damaged segment or treating strictures and fistulas helps the substantial minority whose disease cannot be controlled medically.
What does private treatment cost?
As a guide, a private colonoscopy typically costs around £1,800–£2,800 in the UK in 2026, with a full diagnostic work-up including MRI small-bowel imaging typically around £3,000–£4,500.
Does health insurance cover crohn's disease?
Insurers generally cover the initial investigation of new bowel symptoms and the diagnosis of Crohn's disease, and will usually cover treatment of acute flare-ups and surgery when needed. However, Crohn's is classed as a chronic condition, so ongoing maintenance treatment, including long-term biologic drugs, routine monitoring and regular specialist reviews, is usually not covered and reverts to the NHS. Anyone diagnosed before taking out a policy should expect the condition to be excluded.
Frequently asked questions
Is Crohn's disease curable?
There is currently no cure, but that headline undersells how much treatment has improved. Modern biologic and small-molecule drugs achieve lasting remission for many people, healing the bowel lining rather than just masking symptoms. The goal of care today is deep, durable remission with a normal quality of life. Most people with Crohn's work, travel, have families and live full lives between and despite flares.
Will I definitely need surgery at some point?
Not definitely, and the odds are improving. Historically most patients needed an operation within ten years of diagnosis, but with earlier diagnosis and more effective medication, that proportion has fallen substantially. Surgery is now used more selectively, for strictures, fistulas or disease resistant to drugs, and removing a short damaged segment can give years of excellent health. It is a treatment, not a failure.
Is private insurance worth having if I might develop Crohn's?
It can help most at the start: rapid access to a gastroenterologist, colonoscopy and MRI within a couple of weeks can shorten the often lengthy road to diagnosis, and acute flare treatment may be covered. Be clear-eyed, though: once Crohn's is established, ongoing management is classed as chronic and typically transfers to the NHS, and a pre-existing diagnosis will not be covered by a new policy.
Related guides
- Acid Reflux (GORD)
- Barrett's Oesophagus
- Coeliac Disease
- Diverticular Disease
- Irritable Bowel Syndrome (IBS)
- Ulcerative Colitis