Amazon.com: "Gripless" A No Grip Guitar Pick System, (LG & XL) Solves dropping issues. Thumb & Finger picks for arthritis, hand injuries, disabilities, hand pain, hand problems from tendonitis or carpal tunnel :
Left hand tendonitis
What Really Causes Guitar Tendonitis (And Why Haven't You Fixed It Yet?) - YouTube
Guitarist Tendonitis - How to Avoid It - Infinite Guitar
A Guitarist's Guide to Managing Aging and Overuse Injuries | Acoustic Guitar
Treatment For Guitar Elbow Tendonitis + Other Instrument-Related RSIs