One on the unavoidable consequences of a whiplash injury is the development of myofascial trigger points in the muscles of the neck. Trigger points form in muscles when the tissue is stressed beyond it’s capacity. This damages the contractile mechanism In the muscle fibers and causes trigger points to form. These knots in the muscles will cause pain, refered pain, stiffness, and weakness. Trigger points in the neck muscles will refer pain into the head and face causing headaches and migraine pain.