Irritable bowel syndrome (IBS) is a long-term condition in which there is intermittent abdominal pain and constipation, diarrhea, or bouts of each in the absence of any diagnosed disease. The cause is unknown, but it may result from abnormal contractions of the intestines. An increased sensitivity to certain foods may also contribute.
In some cases, IBS may be triggered by an episode of gastroenteritis. Stress and anxiety tend to worsen the condition.
Symptoms tend to come and go, but attacks often recur for years. They vary widely among individuals and with each episode. Symptoms may include bloating and excessive gas (flatus); abdominal pain that may be relieved by defecation or passing gas (flatus); diarrhea, constipation, or both; and passing mucus during defecation.
IBS can often be controlled by self-help measures, such as a change in diet, exercising regularly, and relaxation techniques to reduce stress. In some cases, medication may be prescribed to relieve specific symptoms.

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