Why are you going to chiropractor? they are not qualified, or regulated and the idea of "spinal realignment" is dubious, and based on no actual evidence, at best chiropracty helps with lower back pain, an unidentified condiition wihch most likely woudl be solved with gentle movement anyway. Any forceful manipulation of the spine carries very real dangers of injury and even paralysis, and a 2012 study recommended that chiropracty not be allowed on the neck area at all, as the risk of death outweighs any of the alleged benefits.
There is no basis for it, you dont need any special qualifications, and its down right dangerous. Woudl you let a total stranger mess around with your spine? because thats what you are doing by believing in chiropracty.