Whiplash is the most common injury from an auto accident. Even if the accident is minor or you do not think you have been injured, there is a good chance that you will have experienced whiplash! The signs of whiplash do not always show up right away, as they can take a few days or even weeks to appear. That said, the most common signs of whiplash include pain and stiffness in your neck that worsens with movement. The range of motion in your neck will usually be quite limited with whiplash.