Depends on what one's already doing.
With druming it's hard to not put some unnatural stress on parts of the body at times.
It's all the typical things. Exercises that stretch and increase blood flow without putting strain on the spot that's already inflamed, diet, hydration, enzymes omega-3 and rest.
It's like any monotonous activity. We are setting ourselves up for repetitive strain injury if we're not conscious of it.
These things are case by case, so best to go to someone who knows.
Chronic stuff can be healed it just takes a while.