Funny to see this post today ... my left wrist is bothering me. I can't say what the cause of yours would be - if you normally practice on an acoustic piano, one day of playing on a non-weighted keyboard shouldn't cause you pain - but it might depend on how hard you're playing.
So, you normally play on an unweighted keyboard, Aewanko, and were on a weighted piano at your friends?When I started with the unweighted keyboard, playing on weighted pianos always gave me trouble. It's possible you're overcompensating because you're not used to it, using more force than necessary, maybe even keybedding (where you're putting pressure on an already depressed key).I'll second A#, an unweighted keyboard is not the same as a piano, the feel is just too different... If piano is what you're after, at least get a weighted digital.
Well all I can really add is my own experiences: I've had various sharp pains, and a bit of lingering tension... Every time something feels wrong, I just stop what I'm doing, take a break, and am careful to be relaxed afterwards, and so far have managed to avoid anything bad. So I think these pains are often warning signs.Does it still ache?
I really don't know... Unweighted feels so akward to me now, I don't know what would happen if I played on one for a while.It would be a good idea to start saving money for one anyways They can be pretty affordable.