I’ve gone to two different chiropractors over extended periods that have done a great job helping my back and neck get stronger and no longer cause me pain. Because that is what chiropractors are trained to do, and can be very successful at.
Then there are those who subscribe to the belief that since nerves run through your whole body, that adjusting your spine can somehow transmit health through your entire body, and prevent or cure all sorts of ailments. They can get into total woo pseudoscience homeopathic kinds of bullshit. Thank goodness I’ve never been stuck with a person like that. But I know they’re out there. Apparently, the origin of chiropractic medicine started with that sort of nonsense, as discussed in this old thread:
Generally, a good chiropractor is really acting as a kind of physical therapist. Like a sports medicine specialist. That’s what I’ve had success with.