I think you’ve gotten a lot of good suggestions, but I’ll add my 2¢. Or, my 1.23¢.
On ergonomics of playing . . . I also had the weird hand/wrist pain when I first started playing. As I paid close attention to how I was holding the flute, it got better, but as Eric mentioned, I underappreciated how tense my hands were. Now, they’re much better, even when holding a heavy and ergonomically crappy (==patent head) flute.
I think the problem mentioned about compression due to strength training. That physiotherapist is probably talking about thoracic outlet syndrome, or any of the various -tunnel syndromes, like cubital tunnel, carpal tunnel, and the like. I think physiotherapists WAY overcall thoracic outlet syndrome. They probably think doctors WAY undercall them. In my several years of giving anesthesia, and a couple years of doing anesthesia excludively for thoracic cases, I’ve given two anesthetics for the repair for thoracic outlet. Two. And during medical school, residency, and whatnot, I think I’ve seen the procedure three times. It’s just not that common, so I don’t think you’ve got a lot to worry about.
That sentiment would be HOTLY contested by PTs, probably. I’m cantankerous. I guess I’d say that you shouldn’t stop doing upper body strength training on the outside chance that you’ll have symptoms in your hands. If your bow arm isn’t bothered by fiddling, we’re probably talking about local phenomena in the hands and wrists, probably a combination of positioning and tension. Even though you’re sure they’re not involved, but they could play a role.
As for referred pain, musculoskeletal pain is almost invariably felt at the site of injury. The reason for referred pain, in basic terms, is that the sensor innervation of the viscera/internal organs is very different from that of the musculoskeletal system. Based on the spot on the (spinal) cord from which organ innervation arises, the brain sometimes interprets pain signals as coming from the musculoskeletal nerves from that area.
Whew, that’s probably confusing . . . let me see.
Sensory innervation of the heart comes from the bottom of the cervical cord/top of the thoracic cord. For the musculoskeletal/skin system, those nerves innervate . . . the arm and shoulder. So, when you’re having ischemic pain, like from a heart attack, it often feels like a crushing pain in the left arm. Likewise, a lot of people who’ve had gallbladder surgery have shoulder/upper back pain, because that’s where we tend to feel diaphragmatic irritation. The brain/body is just a heck of a lot better at localizing the limbs in general, and skin/bone/muscle pain than it is at figuring out what’s going on deep inside.
Maybe helpful . . . maybe not.
Stuart