Premenstrual Syndrome 

A week before your period begins, your mood swings from depression to irritability to downright anger. Your breasts become tender, your abdomen swells and your pants fit like sausage casings. You feel lethargic, have trouble concentrating and crave junk food.

No one knows for sure what causes PMS. Some believe it's caused by chemical changes in the brain. Fluctuating hormones also may play a role. Low levels of vitamins and minerals have been associated with some symptoms. So has eating a lot of salty foods, which may cause fluid retention, and drinking alcohol, which may cause mood and energy level disturbances. It's possible all these factors contribute to some degree.

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