A trigger point is a hyperirritable area usually found in a band of tight muscle or fascia, commonly felt as a knot. These points can be tender when touched and may refer pain to predictable areas elsewhere in the body. A trigger point may also affect the strength and length of a muscle, limiting your flexibility. Trigger Point Therapy reduces the pain of the point (and any referring pain) and diminishes the knot. As tension headaches are often the result of trigger points in the shoulder and neck, trigger point therapy is also a highly effective technique to eliminate and prevent headaches. Trigger points can be found on any muscle in the body and therefore the referral zone of a trigger point has dozens of corresponding locations, for example, the forehead, the base of skull, the lower back and so on.