I usually leave the answers to the pros here, but since you're a fellow Ontarian, I will try to give you some info.
A stricture is a narrowing of the intestine. It can be caused by inflammation or scar tissue from repeated inflammation and healing of the tissue lining of the intestinal wall. Inflammation is preferable, as it will respond to medication and can be cleared up. Scarring on the other hand is permanant. If the narrowing gets to point where you start to get a blockage, complications can start to manifest themselves.
I don't want to go into too much detail about this, as I still have alot to learn about strictures as well. I'm sure you'll get some other responses from people that have direct experience. You should likely see a Gastroenterologist for an exam, and some diagnostic testing.
My daughter was diagnosed Feb. 19/07, (13 yrs. old at time of diagnosis), with Crohn's of the Terminal Illium. Initially, 9 weeks of Prednisone, currently taking 2000mgs of Pentasa.