It depends on what you consider a flare. As some people say they are in a flare when they start experiencing symptoms, which generally sends them to a doc where they do tests and determine their CD is still not completely under control. Other people go for a really long time with out symptoms and consider themselves in remission then due to a checkup colonoscopy find inflammation has been simmering and causing damage. So, even if you don't feel like your symptoms are "flaring" the CD isn't completely under control if you have mild inflammation, and that is if you decribe remission as complete mucosal healing and no active disease. Of course, this is just my interpretation, and others with more experience or better understanding of the scientific definitions of these words and phrases will hopefully be by shortly to help you out!