I think the pain is also from repetitive motion. I am right handed but I have a problem with my left hand. My left hand index finger and thumb will go completely numb/cold. My left hand controls the tension of the yarn, holds the piece I'm working on and the wrist rocks back and forth with each stich of the afghan.I used yarn under single crochets for the first time and aimed to make this as perfect as possible and I really love how he turned out. But to be honest the yarn unders really hurt my hand, they're harder to do, don't always stay on the hook before pull through, which is extremely frustrating at times.
