Our little tom cat is only two, but he has had lots of health problems, ever since we acquired him from the RSCPA, as a wild, cuddly (apparently feral) kitten.
The vets don't know, exactly, what is the matter with him, but it's an auto-immune condition of some kind. Tests show that it isn't cat AIDS.
He gets abscesses and blisters on his pads, which bleed. A course of steroids helped with that, but he was unable to continue the treatment immediately, because he needed his annual booster shots.
Then he couldn't have it because he developed a kidney problem. His kidneys and lymph nodes were badly swollen. A course of antibiotics seemed to be helping, but the problem has not been cured and now he has oedema in his paw and ~ worse ~ his head. His face is swollen and he cannot see, so he is disoriented, unco-ordinated and nervous.
He is at the vets now. They think that all of his conditions may be linked.
I hope that they can help him. He is a beautiful affectionate little thing and it's horrible to see him unhappy