Anyone who has an invisible illness will know exactly what this t-shirt means. When your daily life becomes such a struggle to get through, yet you look like everyone else, it is very emotionally taxing on your self-esteem. You start stressing about things you never did in the past. You start losing contact with your closest friends and even some family. You start missing out on your favorite activities. "You don't look sick, what's the matter with you?" You start feeling like you have to defend yourself for all kinds of things, but then you feel like you are complaining or ungrateful. You KNOW that nobody can visually see your illness the way they may recognize the illnesses in other people. You get to a point where you don't even recognize yourself most days, but then again, neither does anyone else. You have literally turned into someone pretty different than you used to be. We feel insignificant sometimes, or some of us all the time. We feel like the flies on the wall watching and hearing everyone else. I guess as long as nobody comes after us with a fly swatter, then we aren't completely invisible.