Whiplash is an injury to the neck caused by sudden acceleration-deceleration movements like those seen in car accidents. It can cause neck pain and stiffness as well as headaches. While imaging may appear normal, whiplash can still cause soft tissue damage to neck muscles, ligaments, and discs. Symptoms can last over a year in many cases. Treatment focuses on pain relief, muscle relaxation, and in severe cases surgery may be needed. Prognosis is often worse for those with multiple injuries, females, and older individuals.