One arm > than other

This ever happen to you?
You're lifting weights (dumbbells) and it seems like one arm is doing a lot better than the other? I was just lifting and my right arm was having a hard time doing the last couple of reps while the left was doing fine, in fact better than usual. I'm right handed too.. I found this odd. What could have caused this? I'm not sore or anything...
 
newf is right... then don't go past that number with the other arm. there was a study done at my school, and over 50% of subjects who say/think this actually don't have a strength/size difference, it's mental.. just a thought!! you could very well be the other 50%...
 
My right arm is a lot stronger than my left (and i'm right handed) You can tell a difference just by looking at my arms. It's not mental (at least for me). I wish I knew how to fix this too.
 
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