Premenstrual syndrome (PMS) is a combination of symptoms that many women get about a week or two before their period. Most women, over 90%, say they get some premenstrual symptoms, such as bloating, headaches, and moodiness.For some women, these symptoms may be so severe that they miss work or school, but other women are not bothered by milder symptoms. On average, women in their 30s are most likely to have PMS. Researchers do not know exactly what causes PMS. Changes in hormone levels during the menstrual cycle may play a role. These changing hormone levels may affect some women more than others. Infrequent or prolonged menstrual periods, excess hair growth, acne, and obesity can all occur in women with polycystic ovary syndrome. In adolescents, infrequent or absent menstruation may rais.
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