What Would Cause Pain From The Shoulder Only When I Do This?

If I take something as light as a stapler, and extend my arm out to my side I am fine, but If i then (with my arm extended) swing my arm in front of me it hurts very badly.
I do allot of weight lifting, and have always had this shoulder pain, it seems to only hurt when my shoulder is rotated to the front of my body.
I have been taking anti inflammatory, and they have not been able to help. ANy suggestions?

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