Video Explanation of the three theories of chronic pain so a patient can understand how pain works and how using electricity in the form of tens, transcutaneous electrical nerve stimulation, or interferential can stop pain.  Video explains how pain messages are felt, how to inhibit and how the body can produce natural pain killers.

Melzack Wall theory, Sjolund opoid peptide with enkelphalins and endorphins, or the new glial cells are mentioned in this video to explain how an external interferential machine or tens machine works to stop pain.