“You seem fine to me,” may be one of the worst things to say to a brain injury survivor – or anyone with a hidden disability – for that matter. This invisibility is one reason why Laura Brydges, an Ottawa woman living with the affects of brain injury, decided she need to do something to make hidden disabilities, visible. (You may have caught the recent Toronto Star article about her from a few weeks back.)
http://torontobraininjuryblog.com/2015/03/26/is-it-the-right-time-for-a-hidden-disability-symbol/