Irregular or Missing Menstrual Cycle
Irregular or Missing Menstrual Cycle What Causes Menstrual Cycle When a girl reaches puberty, her hormones become active. A hormone called estrogen is made in the ovaries. Estrogen affects the lining of the womb and makes it grow and develop. After 10 to 14 days, the ovaries release an egg, and begin to produce another hormone called progesterone. The egg has now moved from the ovary to the uterus through the Fallopian tube. If the egg has not been fertilized by a sperm, the production of progesterone stops. When that happens, the lining of the womb comes away with a some blood and the woman gets her monthly period. The entire process takes about 28 days. Irregular and Missing Menstrual Periods Menstrual cycles that vary more than a few days in length from month to month are considered irregular. Most menstrual cycle intervals occur about every four weeks, with the normal range between 24 and 35 days. To measure your menstrual cycle, start counting from the first day of your last peri...