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Crohn's disease

8-minute read

Key facts

  • Crohn’s disease is a type of inflammatory bowel disease.
  • Symptoms can include abdominal (tummy) pain and diarrhoea.
  • Although there is no cure for Crohn’s disease, there are treatments available to help control the inflammation.

What is Crohn’s disease?

Crohn’s disease is a type of inflammatory bowel disease. It causes swelling and inflammation (redness) inside your digestive tract. This can lead to symptoms such as abdominal (tummy) pain and diarrhoea.

Crohn’s disease can develop at any age, but usually first appears in people aged 15 to 30 years.

Crohn's disease is more common in people living in the Western world, but it’s also becoming more common in developing countries. Australia has one of the highest rates of inflammatory bowel disease in the world.

What are the symptoms of Crohn’s disease?

Common symptoms of Crohn’s disease include:

Other symptoms may include:

Symptoms tend to come and go over time, as the inflammation flares up then eases again. Symptoms also depend on which area of your gut is affected.

Not all people with Crohn’s disease will have the same symptoms.

What causes Crohn’s disease?

Crohn’s disease is an autoimmune condition — this means that there is a problem with your immune system.

The exact cause of Crohn’s disease isn’t known. But it is known that genetics, infections and other environmental factors are important.

Environmental factors may include:

  • eating a ‘Western diet’ — a diet that is high in fat, sugar and processed foods
  • smoking

While stress and some foods can trigger symptoms, Crohn’s disease is not caused by diet or stress alone.

What is the difference between Crohn’s disease and ulcerative colitis?

Ulcerative colitis is another type of inflammatory bowel disease (IBD).

These 2 diseases affect the digestive tract in different ways:

  • Crohn’s disease can affect any part of your digestive tract, from your mouth to your anus (back passage). It usually affects the last section of your small bowel (the ileum) and/or your colon. Inflammation can extend into the entire thickness of the bowel wall.
  • Ulcerative colitis only affects your large bowel (colon and/or rectum), and inflammation is only in the surface layers of your bowel lining.

When should I see my doctor?

See your doctor if you have any symptoms of Crohn’s disease. Your doctor may refer you to a gastroenterologist (specialist doctor) for diagnosis and treatment.

To find a health professional near you, use the healthdirect service finder.

How is Crohn’s disease diagnosed?

Your doctor will ask about your symptoms and health in general. They will also examine you.

Your doctor or specialist may recommend some or all of the following tests to help diagnose Crohn’s disease.

  • Blood tests — can show inflammation and any vitamin or mineral deficiencies.
  • A stool sample — can test for faecal calprotectin, this shows if there is inflammation in your bowel. Stool samples are often tested for infection as well.
  • A colonoscopy (or sigmoidoscopy) — a thin, flexible tube containing a tiny camera looks inside your bowel for inflammation. A similar test can also be used to look inside your stomach (gastroscopy).
  • Biopsies — small samples of tissue may be taken from inside your bowel during a colonoscopy. These are examined under a microscope to look for signs of disease.
  • Imaging tests — such as an MRI scan or CT scan may also be recommended.

How is Crohn’s disease treated?

Although there is no cure for Crohn’s disease, there are several treatments to help control your inflammation.


Medicines that may be used to control inflammation in Crohn’s disease include:

  • medicines that supress your immune system
  • biologic medicines
  • corticosteroids
  • 5-aminosalicylates


Your doctor or specialist may also recommend a specific diet that suits your situation.

They may also recommend dietary supplements to boost your levels of:

To find an accredited practising dietitian, who may be able to help manage your Crohn’s disease with diet, visit the Dietitians Association of Australia.


Surgery for Crohn's disease is sometimes needed to remove or widen sections of your bowel that are badly affected by disease. The healthy ends of your bowel are usually re-joined to each other.

Sometimes, a stoma (an artificial opening in your tummy that diverts faeces (poo) into a bag) is needed. A stoma can be temporary or permanent. It’s normal to feel uneasy about the idea of living with a stoma, but it often greatly improves your quality of life.

Lifestyle measures

Smoking can make your symptoms worse. Quitting smoking can reduce your symptoms and lower your risk of a flare-up of your disease.

To keep healthy, also consider:

Can Crohn’s disease be prevented?

While you can’t prevent Crohn’s disease, you can reduce your risk by quitting smoking.

You can also help prevent flare-ups and complications by taking your medicines and maintaining a healthy lifestyle.

What are the complications of Crohn’s disease?

There are several possible complications associated with Crohn’s disease. These can be related to your gut or other parts of your body.

It is possible to develop problems with nutrition if you have Crohn’s disease.

Crohn’s disease can also affect your mental health and wellbeing.

Bowel obstruction

Crohn's disease can cause bowel obstruction. This is a medical emergency that needs to be treated in hospital.

Symptoms of bowel obstruction can include:

  • increasing abdominal pain and cramping
  • vomiting
  • bloating

If you suspect that you are having a life-threating medical emergency, call triple zero (000) immediately and ask for an ambulance.

Other gut complications

Crohn's disease can cause complications anywhere in your gut. Complications around your anus can include:

Fistulas are another possible complication. Fistulas are tunnels, or ‘tracks’, that connect your bowel to:

  • other parts of your gastrointestinal tract
  • other organs
  • your outer skin surface

Fistulas usually develop in areas of severe scarring and ulceration.

Inflammation in other parts of my body

A small number of people with Crohn’s can develop inflammation in other parts of the body, such as the:

Resources and support

Speak with your doctor or gastroenterologist to learn more about your condition.

You can also visit Crohn's & Colitis Australia or call the IBD helpline on 1800 138 029.

The Gastroenterological Society of Australia (GESA) also has resources on Crohn’s disease.

For more information about living with a stoma, visit the Australian Council of Stoma Associations.

You can also call the healthdirect helpline on 1800 022 222 (known as NURSE-ON-CALL in Victoria). A registered nurse is available to speak with 24 hours a day, 7 days a week.

Learn more here about the development and quality assurance of healthdirect content.

Last reviewed: February 2023

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