I have always had some fretting hand issues with some chords and legato passages. My hands are small and I've never done stretches or incorporated a warm-up routine in my playing. Stupid, really. Anyhow, I have pain in my left wrist (at the top) that playing is aggravating. My left thumb is also sore. Dr. Google suggests that it is tendonitis. I don't think the issue is with my technique or playing position, just a lack of warm-ups. I'm going to see my doctor in a couple of days. Has anyone else here experienced fretting hand/wrist issues? Any tips? I'm going to buy a wrist splint to wear when I sleep, and once the problem has resolved I will incorporate stretches etc into my routine. I'm guessing I'll have to quit guitar for a few weeks. Total wrist rest isn't an option, as I have a physically demanding job, and I write with my fretting hand. I'm still hoping I can improve the situation.