Dear Alien,
I had the colonoscopy, and when that came back normal, he diagnosed me with IBS. I have had constipation for years, and he said all that time it was IBS. He did say that my colon was a little larger than normal, but that was because of the constipation year after year after year.
I don't have trigger foods either....I know when I eat something one day, it may hurt my stomach, but two days later is doesn't. I'm not big on trial and error or cutting out things just to see, I'm rather lazy after working all day, going home starting work again, raising two kids and taking care of my husband.
Doctors would probably look for Chron's, diverticulitis, there's many things that they can check you for. The colonoscopy is the main test that will allow them to diagnose you for IBS (AS FAR AS I KNOW). I'm not aware of any other. Also your health history is important for any doctor really, so that they can use that in their diagnoses.
Just be sure that you go see a doctor and let him look around to determine your problem.
A
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