Bipolar, a whole range of kidney issues, and chronic anemia. Basically stuff that's just motivation killers. I feel so bad looking at this thread though and seeing people with much worse working through the pain to do what they love. It's heartening but I feel like I need to get over myself sometimes haha
I also have chronic muscle problems in my back, shoulders, and neck, but that's a series of RSIs that I haven't started taking care of until recently, now that they're getting in the way of me working. I'm lucky as all hell and work for a studio that takes this stuff really seriously, so they're paying to put me through physical therapy to work through these problems. You never realize how much you can really injure yourself just sitting at a desk drawing for hours.