Basically, chiropractors say that because your bones are out of alignment you need to be fixed. In fact, x-rays show that bones are not actually misaligned. Moreover, the authors of the paper examined the chiropractic literature for evidence that misalignment actually caused other health problems and could not establish causation on any criteria.
Take a read below for an review and the actual article:
And stop shelling out money for trips to the chiropractor. They are probably doing more harm than good.