Prolactin can stop ovulation? Prolactin is a hormone that helps with breastfeeding, but if your prolactin is high when you're not breastfeeding, it can shut down ovulation. So if your cycles are irregular, or you're not ovulating, I check prolactin. Some women even have milky discharge from the breast when they press it, and they don't know it matters. The good news? This is treatable. Sometimes it's stress. Sometimes it's a small benign pituitary issue. But you deserve to know. #infertility #ob