My hand is aching. Did I do the dumbbell exercise wrong?

Anonymous
I did some biceps curls, quite a few actually (I didn't keep count). I did as long as I couldn't do anymore and now my hand is aching, mostly in the biceps part. Did I do anything wrong or is it normal? When I bend my hand and straighten it, it aches a little bit in the bicep.
My hand is aching. Did I do the dumbbell exercise wrong?
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