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, ...

For many people, a missed period is the first signal that they're pregnant. However, this often isn't the first sign of pregnancy your body gives you. From hormonal changes to swollen breasts or ...

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Breast development usually starts about two years before the first period. Emotional changes and mood swings can occur just before the period. Growth spurts and pubic hair growth are early signs of ...

"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 ...