What is a dislocated shoulder? It is an injury where the upper arm bone comes out of the cup-shaped socket which is actually a part of the shoulder blade. The shoulder is one of the most mobile and movable part of the body which often gets dislocated if sudden accidents occur. Shoulder dislocation needs immediate professional assistance. But how would you actually know whether the shoulder is dislocated or not? Following are the list of symptoms which will help you to identify whether your shoulder is dislocated or not: Symptoms of shoulder dislocation Extreme pain in the shoulder area an