Craniosacral therapists work the spine and head to ease the restrictions of nerve passages, reduce pain, and realign bones. According to MassageTherapy101.com:
The theory behind craniosacral therapy is that when blockages occur in spinal fluid, an unharmonious balance in the body can occur, resulting in muscle and joint strain, emotional disturbances, and the improper operation of the body's organs and central nervous system.
Sounds good, but craniosacral therapy doesn't have much in the way of science to back it up. It does, however, have time on its side. The idea goes back to the turn of the (last) century, when William Sutherland came up with the theory that bones in the skull could move. This led to the idea that by gently touching the different membranes and fluids that surround the brain and spinal cord, therapists could enhance bodily functions.
Craniosacral massage is credited with helping all sorts of maladies, from migraines to autism. Practice of this treatment was once limited to chiropractors, osteopaths, and physical therapists, but because it poses little threat to the body if done incorrectly, it is now offered at a lot of yoga centers and spas. A typical treatment lasts between 20 minutes and an hour with the client lying on his or her back while the therapist lightly touches certain spots.