Muscle tear,ligament damage,pinched nerve or the like.The shoulder joint area is complex and the cause could also be a number of other conditions related to the shoulder or neck or even the back.
bad posture, or when you are sleeping you might of slept the wrong way or side that can cause it
Dislocated Shoulder
. it was only caused of tiredness.. and stress.............. thnx... i hope .. i help you..
I Originally Thought That It Was A Sign Of A Stroke Either Before Or after You've HAd One But I Can't Be Sure It Could Just Be A Pulled Muscle ??
It could be a pinched nerve. My mom had that same problem,Becuase of a penched nerve.