Invisible illnesses: What are they, who do they affect, and how can one cope?

An invisible illness is a physical, mental, or neurological health condition that isn't outwardly visible. For an idea of numbers, invisible illnesses or disabilities affect 10% of the 61 million Americans who deal with a physical or mental ailment. Yet there is huge stigma surrounding invisible illnesses or disabilities, as people suffer judgment from others who often state that they "don't look sick."

But what is an invisible illness, and who is most affected? This gallery covers all you need to know, including coping strategies. Click on to discover more.