Diareah!

Yes it can be the pred reduction. I know I've read that people who start lowering their doses that they get a temporary increase of symptoms. Two things that I know can help with D is using Rowasa until you get off the pred. Also you can try a fiber supplement to increase the bulk of your stool. Have you ever tried Rowasa? Are you able to tolerate them?

Supplementation with l-glutamine is also highly recommended for healing the gut and getting diarrhea under control. It's a tasteless white powder... you can find it at health food stores, GNC, places that sell body building supplements.