This document discusses disorders of menstruation, including amenorrhea (absence of menstrual period), premenstrual syndrome (PMS), and menorrhagia (heavy menstrual bleeding). Amenorrhea can be primary (periods never start) or secondary (periods stop) and has many potential causes including pregnancy, breastfeeding, menopause, hormonal imbalances, medications, and structural issues. PMS involves physical and emotional symptoms in the one to two weeks before a woman's period, and is thought to be related to cyclic hormone changes. Menorrhagia is heavy or prolonged bleeding and can be caused by hormone imbalances, uterine fibroids, polyps, medications, and other medical conditions. Diagn