If you've been injured, you should get evaluated promptly.
If you think you've been injured, you should absolutely go to a doctor, whether it's after the car accident or for any other reason. My standard answer is if you know you've been injured, or you believe you might have been injured, it just makes sense to see a medical professional. Find out what's going on with your body and find out what it might take to get your body better and begin the process of recuperation. Obviously, if you haven't been injured, there's no sense in making a doctor go through that effort and make that determination.
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