What is Inflammatory Bowel Disease (IBD)?

Inflammatory bowel disease (IBD) is a gastrointestinal (GI) disorder1 that involves long-lasting inflammation of the digestive tract.2


When your healthcare professional talks about IBD, they are usually referring to chronic (long-term or life-long) conditions such as Crohn’s disease (CD) or ulcerative colitis (UC).3

What is Inflammatory Bowel Disease (IBD)?

What causes IBD?

Although the exact cause of both UC and CD is still unclear, it is known that it involves a complex interaction between four factors:4,5

A red flat-style icon depicting a DNA double helix with horizontal rungs. Appears above the label 'Genetics (family history)' in the four-factor IBD causes diagram. Represents hereditary predisposition as one contributing factor in IBD development.
Genetics

(family history)

A red flat-style icon of a globe surrounded by circular arrows. Appears above the label 'The environment (e.g. diet, smoking, infection or antibiotic use)' in the IBD causes diagram. Represents external environmental factors that may contribute to IBD.
The environment

(e.g. diet, smoking, infection or antibiotic use)

A red flat-style icon of a circular spiky pathogen form. Appears above the label 'The immune system' in the IBD causes diagram. Represents immune system dysfunction as a contributing factor in IBD, where the immune response attacks healthy gut tissue.
The immune system
A red flat-style icon depicting the outline of a stylised intestinal tract. Appears above the label 'Bacteria in the gut' in the IBD causes diagram. Represents the role of the gut microbiome in IBD development.
Bacteria in the gut

What are the two types of IBD?

Although IBD can develop at any age, there is a first peak onset of IBD during late adolescence or young adulthood 6 and a second peak at ages over 60 years old.7 IBD in the elderly is generally more difficult to diagnose resulting in up to six years’ delay due to other diseases with similar symptoms or treatment effects.7

There are two main types of IBD:4

A red stylised illustration of the gastrointestinal tract showing circular inflammation markers distributed across multiple, non-contiguous locations from the upper to lower GI. Signal indicators suggest active inflammation at each site. Visually conveys that this form of IBD can affect any part of the digestive tract.
Crohn’s Disease (CD)

Crohn’s disease (CD) can occur anywhere in the GI tract between the mouth and anus. Find out more about this condition at the link below.

ulcerative-colitis
Ulcerative Colitis (UC)

Ulcerative colitis (UC) is a condition that only affects the large intestine. Find out more about this condition at the link below.

More questions about ulcerative colitis or Crohn’s disease?

Find more answers at the resources below

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