I had a good friend who saw a chiropracter for 3 years for back pain. She then got bronchitis one winter and went to her physician, who did a Chest X Ray. She had a tumor in the exact spot that had been bothering her. And it was lung cancer. And the cancer had already spread to her brain. She spent several years undergoing grueling treatment and subsequently died from the brain mets.
I don't have an opinion on chiropracters one way or the other. But I would caution anyone being treated for pain to please see a physician to rule out serious causes before turning to
alternative treatments like chiropractic.