In gastroenterology, irritable bowel syndrome (IBS) or spastic colon is a functional bowel disorder characterized by abdominal pain and changes in bowel habits which are not associated with any abnormalities seen on routine clinical testing. It is fairly common and makes up 20-50% of visits to gastroenterologists. There are two forms, dependent on which symptom predominates: Lower abdominal pain IBS and Non-ulcer dyspepsia. The abdominal pain type is usually described in a patient as either diarrhea-predominant (IBS-D), constipation-predominant (IBS-C) or IBS with alternating stool pattern (IBS-A). An important new IBS subtype, post-infectious IBS (IBS-PI), is drawing much clinical investigation.

Symptoms

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Symptoms of IBS are abdominal pain or discomfort associated with changes in bowel habits in the absence of any apparent structural abnormality. The pain is commonly relieved by defecating or modulated by other triggers of gut motility. Generally there is no pain when patients are asleep. Symptoms usually start in young adulthood.

There appears to be an overlap of IBS with stress, chronic pelvic pain, fibromyalgia, chronic fatigue syndrome, the American folk medicine use of term hypoglycaemia, and various mental disorders (in a small minority). While no single explanation for this phenomenon exists, it does strengthen the view that there is a neurological and psychological component to IBS. Recent studies indicate that presynaptic neural effects secondary to the release of histamine (part of immune response) is likely related to these problems.

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