If you sustain moderate or mild injuries, you may not need emergency room treatment. However, it is always best to err on the side of caution – go to the ER or visit Urgent Care if you believe you need prompt medical attention. Even if you do not initially think you need emergency care, it is critical that you see a doctor or qualified health care provider after a car crash. This is true even if you believe your injuries are mild or if you do not believe you were injured at all. In many cases, car accident injuries can take hours or even days to appear. Adrenaline often masks injuries. In the initial aftermath of the collision, you could be in shock and not notice your injuries or how severe they really are. Not only is it important that you seek medical attention for your own health and well-being, but doing so could ultimately benefit your car accident claim. Creating a record that you sought medical treatment immediately or soon after the collision could be extremely powerful evidence of your injuries, as well as the subsequent damages they led to, such as medical bills, lost wages, pain and suffering.