The trapezius muscle or traps is a large diamond shaped muscle located in your back and neck. It is responsible for both neck and shoulder movements as well as stabilizing these areas. Because of this the traps are a very common muscle to become overloaded and strained. When this happens trigger points form in the muscle and cause pain, refered pain, stiffness, and weakness. The upper portion of the muscle is the most common area in the body to develop trigger points. These points refer pain up the neck, behind the ear, and into the temple causing headaches. Trigger points in the lower parts of the muscle will cause shoulder and upper back pain. Trigger points need direct attention to be treated. Otherwise they can out live you! –