SHARP pain in my right arm.?

I

Imran7898978798789997

New member
I weight train my LEFT arm because I want to strengthen the arm. Today I wanted to start doing my right one again, and I felt this EXCRUCIATING pain when I pivoted the dumbbell.
(I play tennis with my right arm.)

What do you think this could be?

Th epain is located throughout the whole arm!
 
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