Editor's Note: We at PS recognize that people of many genders and identities have menstrual cycles. This particular story includes language from experts who generally refer to people with menstrual ...

In 2018, Fitbit was one of the first names in wearable tech to add menstrual cycle tracking to its app. Other brands have now done the same – such as Garmin, Samsung and, more recently, Apple.

Menstruation usually begins around two years after breast development, often between the ages of 12 and 13. This first period is called menarche. The menstrual cycle typically spans about four weeks, ...

For someone who has been menstruating for over a decade, I am not very good at it. You know the people I'm talking about: the ones who track their flow religiously and can preempt exactly when they’ll ...