I work shoulders yesterday, and it was quite painful on DB shoulder press. I also done lateral raises and front raises both exercises experienced no/little pain.

if im at down and push my hand on the floor to get up it hurts then to.

it seems that anything that envolves the pec stretching or contracting seem to give the sharp pain. It makes me wonder if it is the tendon of the pec where i laps over the bicep as iys not coming directly from the shoulder joint.