system
A chat on subreddit /r/NoStupidQuestions
human
A. It's a pseudoscience. You cannot cure a cold by manipulating the spine.  Anyone who tells you that is selling snake oil. Your immune system is not tied to spinal alignment. Rapid manipulation of the cervical spine has led to severe injuries including strokes and death. They cannot cure acute problems, "in only 65 sessions. But if you pay for all of them now, you'll get a 40% discount and it will only cost you $2995." The best thing they do is massage therapy. Look into its history and you'll see its origin is shady.   "D. D. Palmer founded chiropractic in the 1890s, after saying he received it from "the other world"".

B. Yes. I've gone my whole life without seeing one. 

C. The majority of back problems are musckuloskeletal, meaning muscle spasm. Massage, stretching, and physical therapy will do better than fixing subluxations.

Edit: Yes, I'm a doctor. We had a chiropractor (who actually worked out of a Family Practice office) give us a lecture in med school. He basically admitted that it's junk science and that the best thing he provided was massage and stretching. He refused to do manipulation because of the danger.
gpt
Adding to this cuz it's right.

They call themselves "doctors" and often take insurance, but they go to pseudoscience for a year or less for their "degrees."

No one told me this and I used to have crappy/no insurance so I'd try to go to chiros. It has never helped. In fact, at one point while seeing a chiropractor I had a kink in my neck that never went away until *after* I *stopped* seeing the chiropractor. 

If you are having back pain issues or other body pains, either use the money for a massage, go to a physical therapist, do yoga, or look up physical therapy exercises at home. All of these options have actual scientific proof that they work.