I have pain in the "meaty" parts of my hands too, particularly in the meat (tendons, muscles) between my thumbs and index fingers. I massage this area (gently) and do some stretching. I think your heat idea sounds great! I always wondered if the wax bath for hands would feel good....

I do. I confirmed it when my rheumatologist had my hands x-rayed for arthritis and there wasn’t even a smidge of arthritis. So I keep my compression gloves and oven mitts available when my hands are screaming. Lately it’s just been basal joint pain for both thumbs.

Yes. Sometime I find it hard to hold a pen or grip something

I have no other illness but Fibromyalgia. My first signs of pains were from my arms. Then it moves or spreads, including my hands. I don’t have arthritist, but were given splints for my hands. I think tender points for FM includes the hands.
Today was bad flare up and my arms and hands were in pain the whole day 😞

yes, cramping all the time/ weakness, tingles