Regardless of the severity of car accidents, they will always be traumatic experiences. While severe injuries are usually immediately evident, yours may only manifest over time. Even low-speed rear-end bumper-bashing incidents can cause whiplash that can lead to years of neck or back problems or one of several other delayed car accident injury symptoms. You may want to refuse medical evaluation immediately after a crash because there is no evidence of broken bones or bleeding wounds. However, this could make it much more difficult to include undiagnosed injuries in any personal injury claim that you want to pursue following the wreck.