I completely forgot until I read more posts here, but I also had a friend who got it as a teen. She was slender and ate healthfully (just the opposite of my 40-something overweight co-worker who has/had it too and had to have surgery). When she was having a flare-up, she had to eat a very low-fiber diet, to let the intestinal pockets rest and calm down somehow. But I have since read that it is mostly caused by too little fiber in the diet. It wouldn't surprise me if there is at least some genetic or auto-immune component, tho, entirely un-diet-related.

Please Keep us posted. Hope it turns out to be a minor inconvenience for you, and short-lived!

Emily