How are anxiety and depression related to irritable bowel syndrome (IBS)?

Scientific studies have confirmed a common association of anxiety and depression with irritable bowel syndrome (IBS) and other functional diagnoses. Anxiety and depression are not the direct cause of IBS and other functional symptoms and syndromes, but there is emerging scientific evidence that anxiety and depression may be generated by the same processes that lead to functional symptoms and syndromes: allostatic load and the bad stress response. Associated anxiety and/or depression can amplify and worsen symptoms.

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