BAsic information description Absence of menstruation in a woman who has previously menstruated. frequent signs and symptoms No menstrual periods for at least 3 to 6 months. Other symptoms may include infertility, acne, hirsutism (excess hair growth), hair loss, obesity, galactorrhea (breasts produce milk when not breast-feeding), headaches, and vaginal dryness. causes A stopping of certain complex body functions that normally result in menstruation. There are a number of...