Menstruation

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MedlinePlus is a service of the NIH National Library of Medicine, the largest biomedical library in the world. Use MedlinePlus.gov anywhere, anytime, on any device - for free - to discover high-quality health and wellness information that is reliable, easy to understand, and free of advertising, in both English and Spanish.

• Menstruation
• Period Pain
• Premenstrual Syndrome
• Vaginal Bleeding

Discover NIH

The National Institutes of Health (NIH) is the nation’s medical research agency making important discoveries that improve health and save lives. NIH is made up of 27 Institutes and Centers, each with a specific research agenda, often focusing on diseases or body systems.

The Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) The primary NIH organization for research on Menstruation. It conducts and supports research on fetal, infant and child development; maternal, child and family health; reproductive biology and population issues; and medical rehabilitation. You can find resources about Menstruation and Menstrual Problems or information on this fact sheet.

The Network of the National Library of Medicine is the largest biomedical library in the world. The outreach efforts of the NNLM assure that researchers, health professionals, the public health workforce and the public are aware of and have access to quality health information available from NLM and the NNLM.

• Period Poverty: A Story from Region 6 | NNLM Discovery Podcast
• Celebrating Moon Times: Flipping the Script on Period Poverty and Standard Puberty Education | NNLM Region 3: HEALTHBYTES Webinar Recording, February 2023
• Know Your Flow: A Menstrual Health Collaboration | NNLM Region 6 Webinar Recording, May 2024

Discover More

• Department of Health and Human Services Office on Women's Health (OWH) promotes public health research, evidence-based programs, policies, and strategies to improve the health and well-being of women and girls. Discover resources such as the Menstrual Cycle fact sheet or learn more on their website about the menstrual cycle.
• National Women’s Health Week (NWHW) is an annual observance that begins on Mother’s Day and encourages women and girls to prioritize their health. Each year, FDA Office of Women’s Health (OWH) chooses a theme to inspire women to learn more about their health and take action to live their healthiest lives. This year, National Women's Health Week is May 11-17, 2025. Find resources to support National Women's Health Week from Office of Women's Health, download and share infographics and resources to help raise awareness and educate. You can also find resources from the FDA, CDC, and the Office of Women's Health Research to support Women's Health.
• All About Periods (for Teens) | Nemours KidsHealth
• Healthy Habits: Menstrual Hygiene | Centers for Disease Control and Prevention (CDC)