Sudden loss of technique

[nosaj123]

Hi everyone,

I've been playing piano for about 7 years, and I have been comfortably playing pieces such as the Appassionata, the Rachmaninoff sonata no. 2, the Tchaikovsky concerto, etc.  However, starting sometime last week, I noticed that my right hand started struggling to play all of a sudden.  The weird part is the problem is only my right hand; my left hand is perfectly fine.  I don't what happened, but my right hand is having a hard time with basic scales and arpeggios.  Going up is fine, but my hand tenses when I go down and my wrist rises.  I'm certain the trouble is with my fingers crossing over the thumb, but it seems like no matter how slow I practice scales there is always tension in my wrist when my fingers cross over the thumb, and I've been practicing pretty slowly recently.  Do you all have any suggestions?

[pianocat3]

I have had issues with my right arm (rotator cuff) or hand with overuse of electronic devices.

[bronnestam]

I think it would be a good idea to see a doctor.

[nosaj123]

So apparently the problem was that I didn't adjust my bench to the right height.  I realized that I recently grew a lot so my normal bench height didn't work anymore.  After lowering my bench a little, everything seems to be fine now lol.

[indianajo]

Congratulations.
Yes, the hand has to be below the elbow with the wrist straight in the horizontal plane. 
Glad it wasn't something neurological.  I finally watched the video biography of Stephen Hawking who has ALS- very scary.  It's a 2013 biography, I wouldn't have watched it except he just came up with some very interesting physics demonstrations on NOVA. The mind is a wonderful toy but the hands are more fun for most of us.