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A girl's genetics can indirectly influence the age when she has her first period, by accelerating her weight gain in childhood, a new study finds.

A number of other genes also can directly affect the age of puberty, some with profound effects, researchers added.

More than 1,000 genetic variants are tied to the age of a girl's first menstrual period, researchers discovered by analyzi...

Exposure to ubiquitous chemicals known as PFAS, or per- and polyfluoroalkyl substances, may delay puberty in girls, new research indicates.

The study is the first to consider the role hormones play in the delay, according to researchers from the University of Cincinnati.

Delayed puberty can lead to negative long-term health outcomes for girls, such as a higher incidence of breast ca...

More girls started puberty before age 8 during the COVID-19 pandemic, a phenomenon called precocious puberty, researchers say.

The reasons include potential risk factors such as increased screen time and less exercise, according to a new study, published online Aug. 3 in the Journal of the Endocrine Society.

In precocious puberty, children's bodies begin changing into adult...

Birth control pills that contain both estrogen and progestin do not contribute to growth of enlarged breasts in teens and young women, a new study finds, and may actually be associated with developing less severe breast enlargement.

Moreover, the combination pills don't increase the risk of regrowth after breast-reduction surgery, said researcher Dr. Brian Labow and colleagues. Labow is w...

Everyone knows that your metabolism peaks in your teenage years, when you're fit and active and feeling your oats.

And everyone knows that a person's metabolism slows down in middle age, as bodies start to expand and sag, and become less energetic.

But that's all wrong, it now appears -- fake news about how humans age that's gained the currency of truth over the years.

Your me...