Whiplash is pain and stiffness in the neck after an injury that has caused the neck to move suddenly or beyond its normal range.
It occurs when the head is suddenly forced backward or forward and is then snapped in the other direction. This kind of motion most often happens to people in a car that is hit from behind. Less commonly, it might happen in a fall, a sports injury, or if you are roughly shaken. The motion causes stretching or tears (sprains) of muscles and ligaments in the neck, and it may damage the nerves. In rare cases, it may cause broken bones.
Your doctor will ask questions about your neck injury and past health, and he or she will carefully examine your head and neck. You may need X-rays to make sure there are no broken bones in your neck. You may also need an imaging test such as an MRI or CT scan to look for other injuries.