<unk> is a non-medical term describing a range of injuries to the neck caused by or related to a sudden distortion of the neck associated with extension, although the exact injury mechanisms remain unknown. The term<unk> " is a colloquialism. "Cervical acceleration–deceleration" (CAD) describes the mechanism of the injury, while the term<unk> associated disorders" (WAD) describes the injury sequelae and symptoms.<unk> is commonly associated with motor vehicle accidents, usually when the vehicle has been hit in the rear; however, the injury can be sustained in many other ways, including headbanging, bungee jumping and falls. It is one of the most frequently claimed injuries on vehicle insurance policies in certain countries; for example, in the United Kingdom 430,000 people made an insurance claim for<unk> in 2007, accounting for 14% of every driver's premium. Before the invention of the car,<unk> injuries were called "railway spine" as they were noted mostly in connection with train collisions. The first case of severe neck pain arising from a train collision was documented around 1919. The number of<unk> injuries has since risen sharply due to rear-end motor vehicle collisions. Given the wide variety of symptoms associated with<unk> injuries, the Quebec Task Force on<unk> Associated Disorders coined the phrase<unk> -Associated Disorders'. While there is broad consensus that acute<unk> is not uncommon, the topic of chronic<unk> is controversial, with studies in at least three countries showing zero to low prevalence, and some academics positing a linkage to financial issues.
Whiplash 
Swayback
Sprain
Post-nasal drip
Tennis injuries
Factitious airs
Laryngospasm
Crossbite