Business Expenses have to be both ordinary and necessary, meaning common and accepted, to be deducted as a business expense.
A chiropractor visit would be a personal medical expense deductible on Schedule A if you itemize. If massage chairs and heating pads are ordinary and necessary for guitar players, then you could deduct those on Schedule C. Those would not be medical expenses, but a doctor's visit would be. Also, if you pay for health insurance, you may be able to deduct the premiums (Self-Employed Health Insurance Deduction) without having to itemize.
See Pub 535 for more details.
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