Includes bibliographical references (pages 425-451) and index.

The New York Times best-selling author of The Vagina Bible offers empowering, period-positive, no-nonsense facts about the science, medicine and myths surrounding menstruation.

Most women, transgender, and non-binary people who menstruate can expect to have hundreds of periods in a lifetime. So why is real information so hard to find? Despite its significance, most education about menstruation focuses either on increasing the chances of pregnancy or preventing it. And while both are important for many people, those who menstruate deserve to know more about their bodies than just what happens in service to reproduction. At a time when charlatans, politicians, and social media are succeeding in propagating damaging misinformation with real and devastating consequences, Dr. Jen provides the antidote with science, myth busting, and no-nonsense facts. Not knowing how your body works makes it challenging to advocate for yourself. Consequently, many suffer in silence thinking their bodies are uniquely broken, or they turn to disreputable sources. Blood is a practical, empowering guide to what’s typical, what’s concerning, and when to seek care.