If you do a search, you'll find this poll has been done before on this message board. As I recall, there were lots of interesting responses.
Based on what I read the last time it was done, you need to add the following key categories:
- Stomach flu/virus - Dieting/Diet Pills - Hereditary factors - Born that way
There may be more, I just can't think of them now!
I was born with IBS, or else I developed it soon after birth. I was C-predominant until I was about 30 than I became an A and then shortly after I became D-predominant.
I may be the longest-serving member of the IBS elite on this board because I've now had IBS for a grand total of 48 years! (In fact, that reminds me ... I had better update my profile because I recently had a birthday!)