That’s tough. Because it can seem to come out of nowhere like it did for me.
Even though I am RH fully I do a lot of things with my left. I noticed that more as my left upper arm has soreness that all of a sudden when I wake up it’s tight and sore. I do use Cold patches or the Ice-Hot patches. I would prefer no drugs. I’m already on Metformin. I feel the soreness when I narrow it to a specific area. Like a pinched nerve.