Whether or not you need a referral to physical therapy depends on your insurance company, but getting one from your primary care physician or another doctor couldn't hurt. Physical therapists treat many different conditions, including arthritis, balance problems, carpal tunnel syndrome, gait problems, fractures, frozen shoulder, sports injuries, recovery from stroke, and many other things.  If you think you need physical therapy, check with your insurance company to see if you need a referral and find a provider in your plan.