The following article reviews demonstrate the potential severity of injury and the longterm effects of having been in an auto collision.  Sometimes these injuries resolve, sometimes they do not.  These articles are only the TIP of the iceburg in terms of the volume of research that is available. Recent Scientific Research Article Reviews "Reduced reactivity and enhanced negative feedback sensitivity of the hypothalmus-pituatary-adrenal axis in chronic whiplash-associated disorders.  PAIN.  Vol. 119, issue 1-3, Dec. 2005, 219-224" Chronic whiplash symptoms may be the result of a "general {systemic} illness with widespread symptom presentation" caused by dysfunction of systems beyond the neck injury. "The association between exposure to a rear-end collision and future health complaints.  Journal of Clinical Epidemiology, 54 (Aug. 2001);851-856." According to the present results, subjects who reported a whiplash injury in connection with a rear-end collision 7 years earlier not only had an increased risk of future neck pain, but also an increased risk of other health complaints compared with an unexposed group We conclude that rear-end collisions resulting in reported whiplash injuries seem to have a substantial impact on health complaints even a long time after the collision Click Here to learn in greater detail the possible injuries and body responses after having been in an auto collision.