Prostaglandins are a group of chemicals made by nearly all of the
body's cell membranes. Different prostaglandins have different effects on the
body; they can help cause inflammation and pain, raise or lower blood pressure,
stimulate uterine contractions and labor, and affect the immune system, nerve
impulses, and body temperature.
Prostaglandins are also artificially produced and used for medical
reasons, such as starting labor.