Menstruation is a natural biological process experienced by nearly half the global population. Yet, for many girls, the first period arrives as a surprise—often misunderstood, feared, or even ...

For girls, starting their period is inevitable. But the age when a child’s period begins, called menarche, can tell them a little about their health later in life. Menarche that begins “anytime ...

It doesn't have to be awkward.

SAN FRANCISCO—A grandfather’s exposure to endocrine-disrupting chemicals may impact the age when his granddaughter starts her first period, according to preliminary data being presented Sunday at ENDO ...