Spinal manipulation is usually performed by a therapist (chiropractor, osteopath, physiotherpist, doctor, etc.). But many people do it themselves. Self-manipulation is by no means safer than the treatment by a therapist, it seems. We have previously seen cases where the results were dramatic: Spinal epidural haematoma after neck manipulation (edzardernst.com) A ‘Self-Chiropractic Spinal Manipulation’ that