Add Yahoo as a preferred source to see more of our stories on Google. Periods are triggered by a drop in hormone levels in your body, specifically estrogen and progesterone, Dr. Anita Somani, ...

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.

Bloating, cramping, and headaches are just a few of the common symptoms of premenstrual syndrome (PMS). The most common cause for PMS is a drop in hormones. Typically these symptoms last about a week ...

The first few times you get your period, it’s totally normal to feel caught off-guard. (But, ofc, not ideal.) In fact, irregular periods are super common in the beginning. Your body isn’t ovulating ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." The first few times you get your period, it’s totally normal to feel caught off-guard. (But, ofc, not ...