For anyone who menstruates, this is a routine question during any visit to your doctor. Health care providers generally ask this to determine whether their patient is concerned about a menstrual ...

For most women, menstruation is a friend who arrives every month, but sometimes it may not come on time. Periods are considered irregular if they come much earlier or later than the expected day.

I am co-author of Welcome to Your Period and receive royalties from sales. It’s a tale as old as time. Around half of adolescents going through puberty will get their period. In high-income countries, ...