Posted Yesterday 9:49 AM (GMT -6)
For many UC does spread. But not everyone who gets left-sided will eventually have pancolitis. You could also be acquiring some IBS secondary to IBD. Or, you may have some virus/infection right now.
The D could be because inflammation had spread - but could also be because your gut microbes got into a less favorable distribution even though the inflammation did not spread.
It may be reasonable to treat the symptom with diet changes, and/or a bit of Immodium, and/or a short course of oral steroids. Going to a biological may not be necessary if Lialda can get on top of things again.
Only a scope is going to say if the inflammation is spreading, or not spreading but worse.