Arthritis in both feet, walking.
Dry feet. I can slide barefoot over my kitchen floor.
Broken toes and a mangled ankle.
The biggest problem was a severe allergic reaction to neoprene insoles. My skin shed up to my knees. The same thing happened from my hands to my elbows. I had to sleep with medicated cream and plastic grocery bags wrapped around my feet and hands for at least a month. I did a patch test which is 100 little gauze pads with different chemicals taped to my back for three days to find out what I was allergic to. Now I only have to worry about arthritis in my right foot from a broken bone.
Just a couple of ingrown toe nails is about it. That was enough as they hurt like hell !
That would have been during my first marathon. I'd never run the whole 42 kilometres before and went out too fast. By the time i'd gone 25 km a pretty girl ran past me and I was so tired I didn't even look at her. By the time I'd gone 35 km I was trying to pretend I didn't have feet at all.
I'd say that my left foot has been replaced by a prosthetic might be a problem. The other one is fantastic though! ;)
I sometimes get toe cramps, but that's about it.