All medical procedures carry risk. Medical doctors freely discuss them with patients. Unscientific medicine, including chiropractic, also carries risk. However, chiropractors have done little to assess the risk, are dismissive when it is raised, and rarely discuss it with patients. Caveat emptor. "How safe are the vigorous neck manipulations done by chiropractors? - The Washington Post."  http://m.washingtonpost.com/national/health-science/how-safe-are-the-vigorous-neck-manipulations-done-by-chiropractors/2014/01/06/26870726-5cf7-11e3-bc56-c6ca94801fac_story.html