@futurebird I have some anecdotal evidence.
A speaking relative of mine taught in a school for the Deaf, and she was told by her ASL teacher that as she fingerspelled, her hands were too tense, and it would give her arthritis. Well, she didn't change her ways and now she has arthritis.
Do you put your stress in your hands? Do the other women in your family? Yarn stores have been getting complaints from knitters because their stress is affecting the knit and frequently they need bigger needles.
Try consciously making all the little muscles in your hands relax. Does it feel any different? If not, just ignore me 