Prostaglandins have been found in almost every tissue in humans and other animals. Prostaglandins control several processes in the body, especially as it relates to the healing process. When tissue is damaged or infected, this group of hormones will create the reactions that cause pain, fever, and inflammation. In women, prostaglandins assist in regulating the reproductive system. The structural differences between prostaglandins account for their different biological activities. Most prostaglandins act locally; for instance, they are powerful locally acting vasodilators.