Awareness causes, everybody has one. Crohn's disease is my cause. My daughter has suffered with it since her pre-teen years. If you don't know what it is, you can google it. There's a lot of useful information out there.
Crohn's disease can suck the life right out of you. The body loses nutrients to sustain it's self and the body basically turns against itself. There are some good treatments out there, but no cure.