Premenstrual syndrome (PMS) refers to symptoms that occur between ovulation and the onset of menstruation. The symptoms include both physical symptoms, such as breast tenderness, back pain, abdominal cramps, headache, and changes in appetite, as well as psychological symptoms of anxiety, depression, and unrest. Severe forms of this syndrome are referred to as premenstrual dysphoric disorder (PMDD). These symptoms may be related to hormones and emotional disorders.

Approximately 75% of all menstruating women experience some symptoms that occur before or during menstruation. Premenstrual syndrome encompasses symptoms severe enough to interfere with daily life. About 3-7% of women experience the more severe premenstrual dysphoric disorder (PMDD). Women with PMDD typically feel deeply depressed and/or irritable for a week or two before or during menstruation, and their symptoms are much worse than those associated with PMS. These symptoms can last 4-10 days and can have a substantial impact...