Pain is a complex sensory and emotional experience that is typically associated with tissue damage. It serves as a protective mechanism to alert the body to potential harm or injury.
This theory suggests that there are "gates" in the spinal cord that can open or close, modulating the perception of pain. For example, rubbing a bumped knee may help alleviate some pain by activating other sensory pathways.
These are natural painkillers produced by our bodies. They bind to opioid receptors in the brain, reducing the perception of pain and creating feelings of pleasure or euphoria.