Motor vehicle accidents, particularly, Rear-end collisions often result in whiplash injuries, which occur when the head is jerked forward and then backward, overstretching and tearing the soft tissues of the neck beyond their limits. The sudden forced movement of the head or neck in any direction and the resulting rebound in the opposite direction is again known as whiplash. The sudden whipping motion injures the surrounding and supporting tissues of the neck and head. Muscles react by tightening and contracting, creating muscle fatigue, which can result in pain and stiffness. Severe whiplash can also be associated with injury to the intervertebral joints, discs, ligaments, muscles, and nerve roots. Car accidents are the most common cause of whiplash.