when asked I try to gauge the person's emotion behind it. it's usually a different answer depending on how's it's asked, I suppose. if it's just some formal and impersonal "are you ok?" I may just say: I'm good, thanks. but if it's a friend or family member who knows my deal, then of course I answer truthfully. on the other hand, I don't wish to be rude or overbearing to strangers who are just politely asking.