Premenstrual syndrome (PMS) refers to emotional and physical symptoms that regularly occur in the one to two weeks before the start of each menstrual period. Symptoms resolve around the start of bleeding. Different women experience different symptoms. The common emotional symptoms include irritability and mood changes while the common physical symptoms include acne, tender breasts, bloating, and feeling tired; these are also seen in women without PMS. Often symptoms are present for around six days. An individual's pattern of symptoms may change over time. Symptoms do not occur during pregnancy or following menopause.