I am not aware of any medical conditions or diseases that are specifically associated with the country of Iran. If you have a specific medical term or condition in mind, I can try to provide more information on that.

It is possible that you may be thinking of "Irritable Bowel Syndrome" (IBS), which is a common disorder that affects the large intestine. The name "Irritable Bowel Syndrome" does not have any connection to the country of Iran, and it is not clear why you might have associated the two. IBS is a common functional gastrointestinal disorder, characterized by abdominal pain or discomfort, bloating, and changes in bowel habits, such as diarrhea and constipation. The exact cause of IBS is not known, but it is thought to involve a combination of factors, including muscle contractions in the intestine, abnormalities in the nervous system, inflammation in the intestines, severe infection, or changes in bacteria in the gut.