Wow, this was a really interesting thread. I really don't have any super interesting disabilities...
I tore my ACL, MCL, PCL, and meniscus hiking once. Because I have no balance and my friends thought it would be good to push me while hiking up a mountain, and I fell, and landed on my right leg REALLY wrong. Then they got to carry me down the mountain. And 2 surgeries later, my knee will need replacing by the time I'm 40. So that kinda complicates the whole climbing up stairs thing.
My only other health issue is that I have a hyperactive immune system. I am allergic to EVERYTHING. (Well, not everything, but a lot of things) Deathly allergic to peanuts, bee stings, and strawberries. I have to carry around an epipen for those three. But I'm also allergic to pineapple, shrimp, cockroaches (strange, I know, but this is what the blood tests I had done said), carob (that fake chocolate stuff), mushrooms, and obviously anything having to do with pollen or trees in the spring/summer.
Because of my hyperactive immune system, I get sick every once in a while. I haven't been sick in 5 years, and the time before that was 3 years. I've been sick a total of 6 times in my 19 years of existence. And every time, the sickness lasts for months. 5 years ago, I had 4 months of bronchitis that turned into pneumonia. I had the flu once for 7 weeks. Its nice, but it sucks at the same time. Because I never know when its going to happen.....