I haven't had much issue with this since my original post until today, when that same thumb is acting up again. I haven't used it for scrolling since then so I don't know what could be causing it. The only other thing I can think of is that I was using colored pencils (something I'd been doing the last time this happened too) which makes me VERY worried. I really hope this isn't going to become a serious problem
It couldn't hurt to get checked out for carpal tunnel or focal hand dystonia.
Now, bear in mind, I'm not a medical doctor at all, so go check with a doctor. But, here's a basic test you can do for carpal tunnel on your own, it's called the Phalen's Test and Reverse Phalen's Test.
To do the Phalen's Test, start with your hands about waist height and put the backs of your hands together, now keep holding that position and raise your hands to chest level, and hold that position for a minute.
To do the Reverse Phalen's Test, start with your hands about chest height, put your palms together, now keep holding that position and lower your hands to waist level, and hold that position for a minute.
If during any of these tests you feel discomfort or tingling in your hands or wrists, it's
probably carpal tunnel.
There's nothing you can really do to check for focal hand dystonia, that requires a medical doctor, and neurological specialist to diagnose.
