Have you ever had someone give you rub shoulders back and feel that you are very ill? This irritation can range from a dysfunction in the spine are connected to these muscles. Try this ... take your index finger and thumb and gently pinch the muscles (the muscles of your shoulder). This is the pain? If so, perhaps because of illness called (pain originating from problems elsewhere), or trigger points in the muscles. Chiropractic Las Vegas Chiropractic Henderson