It does, yes- because he is able to heal so rapidly, it can be hard to pinpoint where the source of the problem is. I have a few ideas of what it might be, however- again, I am leaning toward a neurological disorder of some sort. Probably not a progressive one, since he has lived for 600 years or so and his symptoms are not more severe, but it could be something his magic is unable to heal for some reason. I believe I will take you up on the offer to study magic theory further, however.