Irritable Bowel Syndrome (IBS), more common in developed countries like the U.S. and the U.K., is a nervous system disorder that affects the bowels (specifically the large intestine, which is responsible for absorption of water and excretion of solid waste).

IBS is a disorder that affects the normal functioning of the body. It does not, however, harm the bowel or cause any other disease. Rather, it is a syndrome or a set of symptoms. In simple terms, it is a malfunction in the interaction between the intestines, the brain and the autonomic nervous system, which affects the bowel movement. IBS is diagnosed and treated by gastroenterologists, who are physicians that specialize in dealing with diseases or disorders affecting the intestines, stomach and associated organs.

IBS can be caused by a disturbance in the functioning of the colon, which is the lower part of the large intestine and connects the small intestine with the rectum and the anus. The colon absorbs the water, nutrients and salt from the partially digested food that enters from the small intestine. It is the contractions of the colon that lead to a bowel movement. In some people, the colon is more sensitive and reacts strongly to certain foods and sometimes to stress. However, while stress may not directly lead to IBS, it can definitely trigger and intensify the symptoms. In fact, researchers have established a direct link between emotional stress and IBS-related symptoms. Studies also indicate that IBS is often preceded by a severe bout of gastroenteritis.

It has been estimated that one out of every five adults in U.S. suffers from this disorder. IBS can develop at any age, but it is more common in the 15- to 40-year-old age group. Often, patients are embarrassed to approach a physician for treatment. It helps to remember that IBS is a common disorder that affects approximately 10 to 20 percent of the population and the best way to cure it is to receive treatment as soon as possible.