For every woman, the monthly menstrual cycle is a life event that was very much a mystery to us when it began. No matter how much information our mothers gave us, or how many health education class lectures we endured, we still didn’t know. Menstrual cycles are as unique as is every woman. Not every cycle is 28 days; menstruation can start on the 26th or 30th day too. Some women have erratic menstrual cycles and they never know when it will begin. The onset of menarche usually occurs anywhere from age 9 to age 17; all girls are different in heredity, weight, activity, diet, health, etc. and this all has an influence on when menstruation occurs for the first time. It is normal for it to be irregular and not come at a regular interval for the first few months. Flow may be very light and last only a couple of days at first, then three months may go by until another menstrual cycle begins. The cycle should become more regular as the months progress, and of course, a health care provider should be consulted if irregularity continues or heavy bleeding occurs.