Hello, I'm 17 year old guy and I have played piano for about 10 years. I have had piano lessons once a week. I also have much school work (high school). After the piano lesson, I usually have a few day break in playing, and after that I play from 20 minutes to 40 minutes a day, depending on the current situation. Sometimes less. Then my wrists have started hurting. They have done that every 1 to 3 weeks, the ache lasting from 2 days to 1 week. And this situation has lasted for almost 1 year. When I feel my hands are okay, and I think this whole problem is over, the ache comes back. In fact, just now I feel like my hands have almost recovered, but that's not possible, last ache disappeared only a week ago. In my opinion, that is not very high amount of playing, so there is something wrong. 1. My hands haven't had enough time to recover. Now I'm having summer holidays, (and no piano lessons) so I can play as much as I want. Some week I even played like 2 hours a day. And after that, my wrists... I just can't control it, when I should stop. When my hands feel a little tired, it's already too late, and a day after my wrists hurt. 2. Something must be wrong in my technique. Especially big 1 octave chords make my wrists hurt. (I don't have small hands, I can get 1 over octave or barely 2 (not playable in a piece). Also a pretty repeating bach prelude (bwv 847). Now I'm playing Bach sinfonia 15 and Ibert white little donkey. They are moderate for my hands. What I have done: I have put chair higher I think it was too low, and harder for my hands. I have put the chair farther away from the piano. I have read that you should keep wrists straight. It's sometimes hard when there are both low and high parts in the pieces (like white little donkey). And now I'm out of ideas.