Soreness and pain are expected following a car accident. Even if there are no obvious signs of injury, the body experiences a lot of trauma during a car accident. It is in your best interest to seek medical attention the same day as the accident, even if you think your injuries are minor.nNot all serious injuries are external, and many do not present symptoms for hours or even days after an accident. You should pay close attention to the following symptoms:nPersistent headache: Injuries such as whiplash create tension in the shoulder and neck muscles, which often result in headaches. As the muscles begin to relax, headaches generally go away as well. If you experience a persistent headache that does not ease, you could be suffering from a brain injury. A medical doctor should evaluate you.nSharp pain: If you are suffering from a sharp pain, especially new sharp pain, in the days following the accident, you should see a doctor. Adrenaline can mask the pain for some time after an accident, and the sudden onset of pain could mean you have a severe injury.