Oxytocin

Overview

Oxytocin is a hormone released from the pituitary gland in the brain. During pregnancy, this hormone causes labor contractions to start. It also is released when a woman's breasts are stimulated by suckling or pumping, causing milk to move from the ducts and out the tiny holes in the nipple. This is called the let-down reflex. In the first few days after delivery, oxytocin also causes uterine contractions. They help shrink the uterus back to the size it was before pregnancy.

Related Information

Credits

Current as of: October 2, 2023

Author: Healthwise Staff
Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

This information does not replace the advice of a doctor. Healthwise, Incorporated, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content.