If you are getting frequent headaches after an auto accident, this may be caused by whiplash. Though your seatbelt restrains your body in a relatively stable position, your head is still free and is often jolted forward and backward during the collision. Whiplash strains the muscles and other tissues in your neck and upper back that may radiate to other parts of your body, including your head. Headaches can also be caused by pinched nerves from misalignment of the spine. If you’re getting headaches after your auto accident, it’s important to see a chiropractor as soon as possible to determine and help correct the injury.