actually speaking of that "everything i love causes carpal tunnel" shirt i know! a muscle that causes carpal tunnel-like symptoms!
the bad news is that it's the underside of the shoulder blade, but the good news is that once you figure out how to reach it, it's quite easy to release!
anyways meet the subcapularis
(all images taken from Myofascial Pain and Dysfunction (3rd Edition) by Travell et al)
the subcapularis helps pull the shoulder forward and rotate it inwards, meaning it's involved in many activities which cause the much dreaded carpal tunnel--yes, even though it's nowhere near the wrist. the anatomy of the shoulder makes it easy for nerves and vessels to get compressed, causing all sorts of fun symptoms like pain, tingling, and cold fingers.
this is the referred symptom zone:
obligatory i am not a doctor, just very autistic about musculoskeletal pain, and can't guarantee this massage will help your carpal tunnel symptoms, but I will say that uhhh every time I do this for myself i can feel all blood and sensation rush back into my arm, and it's always best to try massage before more invasive stuff like surgery
1. Find a spot where you can sit, feet planted on the ground, and lean forward and rest your head on something with your arm hanging down between your legs. This will slide the shoulder blade to the side of the ribs, where you can reach the underside.
2. Above is what the subcapularis looks like with the surrounding muscles. Using your fingertips (you might wanna cut your nails) or your thumb if preferred, find the bony edge of the shoulder blade, and start poking around the underside.
3. You'll most likely only be able to reach the edge of the muscle, but that's enough! When you press into it, you will probably feel like you're reproducing your symptoms. Don't worry; you aren't hurting yourself and in fact this means you're in the right spot! Massage it gently, enough to feel it but not enough to wince, until you can't find anymore painful spots (or until you feel better, sometimes you can't get it all in one session).
3.5. If your pain increases overall, don't do it. Though pressure should elicit symptoms, this type of massage should provide pretty immediate relief, and if it doesn't then either some other muscle(s) is involved or it's not muscle related at all.
4. Finish up by rolling your shoulder back, like you're stretching out your chest/reaching behind you, a few times. It's normal to hear clicking--good, actually, that's the sound of your body realigning.
5. I recommend doing this at least daily, even after the symptoms have eased, until it's no longer sensitive to massage. Keep in mind that this muscle has been overused, and that the muscles that oppose it have weakened. It will keep trying to tighten up again until the weakened muscles have recovered, so you need to actively treat it and keep an eye out for habits that cause you to roll the shoulder forward.
And that's it! If you intend to resume carpal tunnel inducing activities ASAP, see if you can take a moment every 30 minutes or so to do a quick shoulder stretch. This helps prevent the muscle from tightening, and you only need to spend moments to do so. Quick breaks like this actually go a long way towards preventing injury, and help you keep working without interrupting the flow to go do some body maintenance :P
