Frank Porreca, University of Arizona (IMAGE) University of Arizona Health Sciences Caption Dr. Frank Porreca, UArizona senior author on prolactin study that shows how the neurohormone associated with lactation makes women feel more pain than men. The study offers additional caution for those who use opioids to control their pain as opioids also promote prolactin release. Credit [Photo: The University of Arizona Health Sciences, Noelle Haro-Gomez] Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.