These may seem commonplace, but it doesn’t have to be normal to suffer with them. Headaches are often caused by neck tension: the joints and muscles of the neck are supplied by the same nerves as the ones that supply the head. If the joints in the neck are tight, they can irritate the nerves and cause referred pain to the head. Chiropractic helps with this by taking the pressure off the nerves and decreasing referred pain patterns to the head.