PMS, or premenstrual syndrome, is characterized by physical, behavioral, and psychological symptoms that occur during the luteal phase of the menstrual cycle and disappear after menstruation. Around 80% of women experience mild symptoms, while 5% have severe PMS. Diagnosis involves tracking symptoms over at least two cycles using a daily diary. Treatment options include lifestyle changes, complementary therapies, oral contraceptives, SSRIs, and hormonal therapies. A multidisciplinary approach is recommended, with surgery only considered for severe refractory cases.