The best rule of thumb when it comes down to seeing a doctor is if you are worried or concerned, you should get it checked.
Whiplash, however, doesn't always require medical care, particularly if it is a mild case. Although being checked whenever the possibility of whiplash is not a bad idea, you really should see a doctor if you experience any of these signs or symptoms:
1 - The pain goes away and then returns.
2 - The pain gets worse instead of better.
3 - The pain spreads to your shoulders and/or upper arms.
4 - You get dizzy or you get pain in your head when you move your head.
5 - Your arms become weak or numb.