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Cause

Premenstrual syndrome (PMS) and the more severe form, premenstrual dysphoric disorder (PMDD), are linked to normal changes in the endocrine system. The endocrine system makes hormones that control the menstrual cycle. The female endocrine system is very complex. Medical experts don't fully understand why normal hormone changes cause PMS in some women and not others.

The one direct cause that is known to affect some women is genetic: Many women with PMS have a close family member with a history of PMS.

Recommended Related to PMS

Why PMS Gives You Insomnia

Most nights, Karin Wacaser, 48, a public relations consultant in Dallas, sleeps soundly for about 10 hours. But three days before her period, like clockwork, Wacaser has intense insomnia, waking up every hour or two. "It's crazy," she says. "And frustrating. Sometimes I'll toss and turn for an hour until I can go back to sleep."At other times, Wacaser lies awake all night, finally falling asleep around 7 a.m. What is going on? "Each phase of the menstrual cycle has different effects on sleep," says...

Read the Why PMS Gives You Insomnia article > >

WebMD Medical Reference from Healthwise

Last Updated: June 08, 2012
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

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