Babaamaajimowinan (Telling of news in different places)

Girls' periods are starting sooner, more irregular than past generations

The question:

Is it true that girls in the United States, particularly girls of color, are getting their periods earlier than past generations?

The science:

A new study of 71,341 women supports the growing concern that the age at which girls start menstruating is getting younger, and the trends are even more pronounced for some racial and ethnic groups. The findings also suggest that many girls and young women are experiencing irregular cycles for years, a risk factor for a variety of health concerns, including cardiovascular disease, metabolic diseases such as diabetes, and certain types of cancers.

The data were collected as part of the Apple Women's Health Study, which was developed by the Harvard T.H. Chan School of Public Health with the National Institute of Environmental Health Sciences (NIEHS) and Apple. The study used cycle tracking data from iPhones and Apple Watches as well as surveys to learn more about menstrual cycles, health risks and gynecologic conditions.


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