Self-Employed Work requires Chiropracter, is that deductable?

I am a self employed musician and I spend anywhere between 10 hours to 16 hours a week with a guitar over my shoulders. As I've gotten older, I have had to see a chiropracter to get my back straightened out each week or else I can sleep well, stand for long, or continue to work. This expense is related 100% to my profession and is a necessary expense in order for me to work, much like a hair dresser would need a floor mat that provides comfort as they work, or an arm brace to combat tennis elbow. Is this deductible on my schedule C? Would a massage chair or heating pad be deductible? If so, why not a Chiropractor visit?