University of California - San Francisco Apr 3 2025 Scientists have discovered a new mechanism that acts via an immune cell and points toward a different way of treating chronic pain.  Female hormones can suppress pain by making immune cells near the spinal cord produce opioids, a new study from researchers at UC San Francisco has found. This stops pain signals before they get to the brain.  The discovery could help with developing new treatments for chronic pain . It may also explain why some