Add Yahoo as a preferred source to see more of our stories on Google. A new study out of Brazil links early or late menstruation onset to health struggles later in life. How the timing of your first ...

A female’s first menstrual period, known as menarche, occurs during puberty. Menstruation indicates that the body is mature enough for reproduction. About 98% of girls begin their periods by age 15.

A health expert has detailed how having penetrative sex and orgasms with a sexual partner can influence menstruation.

Your period could be crampin’ your style — and your future health. Girls are reaching puberty faster than previous generations, a phenomenon perplexing researchers. The average age of the start of ...