A whiplash injury usually occurs in car accidents and describes a force acting on the cervical spine associated with symptoms such as head or neck pain, dizziness and other neurological problems. Mostly no clear injuries such as fractures are detectable via MRI or CT.
Often it turns into a chronic whiplash syndrome which is highly controversial discussed in medicine. Some doctors think chronic whiplash syndrome does not exist and it is a psychological disorder although this was refuted long time ago by current literature.
Whiplash injuries are probably the most common cause of cervical spine instabilities.