Add Yahoo as a preferred source to see more of our stories on Google. Close up on a woman's hands holding a calendar, on which there are five days marked with a red X (representing her last period) ...

Normal menstruation starts at menarche around age 12, and lasts until menopause at around 50 years of age. This bleeding is controlled by the hypothalamo-pituitary-ovarian axis and consists of ...

There are a number of possible reasons for bleeding between periods, including hormonal changes, infections and certain medical conditions. When you purchase through links on our site, we may earn an ...