What is IBS?
IBS is known as a functional bowel disorder because there is no particular abnormality that causes it. Instead, patients have a cluster of symptoms. The major symptom of IBS is abdominal pain or discomfort. Patients have either diarrhea or constipation, or they might alternate between the two. Other common symptoms are bloating, a sensation of incomplete evacuation, urgency, particularly in patients with diarrhea and sometimes mucus in the stool.
How common is IBS?
Worldwide, the prevalence is between 10 and 20 percent. What's interesting is that about two-thirds of individuals who have IBS don't see a doctor for their symptoms. “I think some people don't realize that they have a condition that their doctors can diagnose or treat,” says Chang. In other situations, people may feel that doctors will think it's “all in their head” because there are no objective tests to diagnose IBS.
What are some reasons for the gender difference?
There are many different reasons why there might be a gender difference. “I think that they include how women and men perceive themselves in society,” says Chang, “and whether they are willing to complain of GI symptoms like gas or diarrhea and constipation.” There are also probably a lot of biologic mechanisms that may have to do with estrogen, the female sex hormone, that affect the gut. So there is a whole host of biologic and psychosocial differences between men and women that may play a role in IBS.