Premenstrual syndrome or PMS is a bunch of symptoms that are associated with the menstrual cycle of a woman. It is a medical condition that is known to affect a large number of women of childbearing age. Premenstrual syndrome symptoms usually occur a week or two prior to your menstrual cycle. Once you are done with your periods for the month, the symptoms too go away. These symptoms can either be physical or psychological. The symptoms depend on person to person.