Conditions InDepth: Premenstrual Syndrome (PMS)
Premenstrual syndrome (PMS) is a disorder marked by physical and behavioral symptoms that occur in a cyclical pattern. They appear a week or two before an expected menstrual period and improve with the onset of menses. The nature and severity of symptoms vary. If your symptoms are so severe that they interfere with daily activities, talk to your doctor about treatment options.
The Menstrual Flow
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Many women of reproductive age have discomfort prior to menses, but a small number cases are thought to be categorized as PMS. This problem is most commonly seen between the ages of 25-34. An even smaller percentage of women with PMS have a very severe form called premenstrual dysphoric disorder (PMDD).
Although the cause of PMS is not known, the cyclical pattern that parallels the menstrual cycle has directed the focus of study to hormonal changes. These changes are thought to act with other factors in the nervous system, as well as the environment, to trigger the symptoms of PMS.
Last reviewedSeptember 2013by Andrea Chisholm, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.