Inversion therapy doesn't provide lasting relief from back pain, and it's not safe for everyone. Inversion therapy involves hanging upside down, and the head-down position could be risky for anyone with high blood pressure, heart disease or glaucoma.

In theory, inversion therapy takes gravitational pressure off the nerve roots and disks in your spine and increases the space between vertebrae. Inversion therapy is one example of the many ways in which stretching the spine (spinal traction) has been used in an attempt to relieve back pain.

Well-designed studies evaluating spinal traction have found the technique ineffective for long-term relief. However, some people find traction temporarily helpful as part of a more comprehensive treatment program for lower back pain caused by spinal disk compression.

Your heartbeat slows and your blood pressure increases when you remain inverted for more than a couple of minutes — and the pressure within your eyeballs jumps dramatically. For these reasons, you should not try inversion therapy if you have high blood pressure, heart disease or glaucoma.