Serious complications associated with chiropractic adjustment are overall rare, but may include: A herniated disk or a worsening of an existing disk herniation. Compression of nerves in the lower spinal column (cauda equina syndrome) A certain type of stroke (vertebral artery dissection) after neck manipulation.
https://www.washingtonpost.com/...neck...chiropractors/.../26870726-5cf7-11e3-bc56...
Jan 6, 2014 - It can also result in serious complications such as vertebral artery dissection followed by stroke.” ... The name alone [i.e., 'chiropractic stroke'] defines causation when that is not known,” since many people go to chiropractors when they have neck pain that may be have turned into a stroke without manipulation.