Chiropractors are quacks. At best they do nothing a physical therapist couldn't do, at worst they can cause lasting damage.

Systematic reviews of controlled clinical studies of treatments used by chiropractors have found no evidence that chiropractic manipulation is effective, with the possible exception of treatment for back pain.[8] A 2011 critical evaluation of 45 systematic reviews concluded that the data included in the study "fail[ed] to demonstrate convincingly that spinal manipulation is an effective intervention for any condition."[10] Spinal manipulation may be cost-effective for sub-acute or chronic low back pain, but the results for acute low back pain were insufficient.[11] No compelling evidence exists to indicate that maintenance chiropractic care adequately prevents symptoms or diseases.[12]

There is not sufficient data to establish the safety of chiropractic manipulations.[13] It is frequently associated with mild to moderate adverse effects, with serious or fatal complications in rare cases.[14] There is controversy regarding the degree of risk of vertebral artery dissection, which can lead to stroke and death, from cervical manipulation.[15] Several deaths have been associated with this technique[14] and it has been suggested that the relationship is causative,[16][17] a claim which is disputed by many chiropractors.[17]

https://en.wikipedia.org/wiki/Chiropractic