[header] How to fix a dislocated shoulder [title] Recognize the symptoms. [step] A dislocated shoulder is usually caused by either falling onto an outstretched arm or the shoulder being impacted from behind. The injury causes sudden and severe pain, preceded by a popping feeling and/or sound. 
The shoulder will look visibly deformed or out-of-place, and swelling and bruising appear quickly. Moving the shoulder is not possible until it is relocated.