UC is the most common form of IBD, with more than 200,000 new cases diagnosed in the U.S. each year, according to the Crohn’s & Colitis Foundation. “IBD isn’t one disease but many,” says David Padua, M.D., a gastroenterologist at Cedars-Sinai Medical Group in Los Angeles. There are as many as 30 subtypes, with different causes—genetic, environmental, dietary, or some combination of all three. That means no two cases are exactly alike, he says. Devising a personalized treatment plan that works for you requires time and patience to learn what’s at the root of yours.