What is the extent of your Uc? If you have Pancolitis, it sounds like it can be a flare however it doesn't sound nice and you should contact a doctor if you can. How high is the fever? If it's high then you are probably sick - sort of sounds like the flu.
My GI never gave me a direct diagnosis, he just said Ulcerative Colitis and that it was "quite bad". However, my symptoms really aren't much when compared to some people here, who I feel terrible for. I have been in remission for a long time and this is the first sign of those dreaded cramps I have experienced, or at least ongoingly.
The fever has settled down since yesterday and that side of things is improving, the cramping is just quite painful right now.
I'm in a tricky situation and I don't feel comfortable going back on Pred.