Earlier in March, NPR featured a piece on people with 'invisible disabilities' and increasing awareness.
Below is a link to the story:
http://www.npr.org/2015/03/08/391517412/people-with-invisible-disabilities-fight-for-understanding?utm_source=facebook.com&utm_medium=social&utm_campaign=npr&utm_term=nprnews&utm_content=20150308