Within the last year I had an aching hand with a click in my thumb joint
1) after knitting small flowers for a baby's hat
2) several hours at a time every day
3) with cotton yarn (even embroidery thread)
4) on #0 needles
5) with intensity.
Little did I know! From November to March I stopped knitting, took aspirin, and did the hand exercises found on various knitting websites. Voila! I lived to knit again, only now I
1) try to remember to do the exercises before and after knitting
2) knit with more breaks, kindlier yarn, larger needles,
3) and with a more relaxed hand and attitude.
But darn, that hat was a beauty.
kmbold