Menstration covers the basics for young women, as well as details of what you should expect and when bleeding is excessive.

What really happens during those 28 days? All about ovulation, hormones, cycles, PMS, Menopause, fertility awareness, and customs and traditions of various cultures.

Consumer health resource center providing information on the causes, symptoms, and treatment.

Information on the causes of missing, irregular or otherwise abnormal menstruation.

Offers advice a woman needs about periods, menstruation, health and well being, and PMS. Includes maternity and menopause.

Menstrual cycle calendar reminders for cell phones to help women track period days and most fertile days. Learn about this free service.

Answers to frequently asked questions about irregularities in the menstrual cycle, particularly late or skipped periods.

Explains the irregular menstruation cycle including abnormal menstrual bleeding and missed periods. Notes common diagnoses and treatments for menstrual disorders.

Or, who says women can't stand the sight of blood? by Alana Wingfoot.

Articles, images, humor, and other resources about the cultural history of menstruation, methods of managing it, and related aspects of female health.

Calculate and print out your mentruation cycle period. Set reminder via email.

Online calendar for tracking menstrual and fertility cycles and symptoms. Includes a period prediction calculator and menstruation charts.

Information and links about menstruation, patterns and commercial sources for reusable cloth sanitary pads and internal cups, and menstrual extraction.

Tampons - what you don't know could hurt you.

A campaign to replace tampons with healthy alternatives and to create positive attitudes towards menstruation and women's bodies.

A web-based application for tracking and predicting monthly menstrual periods.

The Red Spot is an information source for women and girls about their periods.

A powerful and transformational work which addresses what it is to be female. It empowers women by embracing the biological cycle and dispels the negative programming women receive from society.

A place where young women can find answers about menstruation.

A brief and simplistic overview of TCM approaches to treating irregular periods with Chinese herbal medicine.