What is Crohn's Disease?

It's interesting to me that this suggests one of the environmental factors that can predispose someone to having Crohn's is antibiotics.

I believe my Ulcerative Colitis was triggered by strong antibiotics. Bizarrely, I am now on antibiotics for life having developed bronchiectasis, following my colectomy.

Have you any of you felt a connection to your illness being caused by antibiotics?