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As long as a woman's short menstrual period is part of a steady pattern and fits within this range, this is normal menstruation for her body. If your period lasts for three days, month in and month out, that's your pattern, says Maria Arias, MD, a gynecologist at Atlanta Women's Specialists in Georgia.Reasons for a Short Menstrual Period. Estrogen is the all-important hormone required to create the endometrium each month.f your period lasts for three days, month in and month out, that's your pattern, says Maria Arias, MD, a gynecologist at Atlanta Women's Specialists in Georgia. Reasons for a Short Menstrual Period. Estrogen is the all-important hormone required to create the endometrium each month.
Causes of Long Menstrual Periods. During a typical monthly menstrual cycle, a woman ovulates and her uterine lining thickens to prepare for conception. If pregnancy does not occur, the built-up tissue of the uterine lining is shed with the menstrual flow and a new cycle begins. Periods typically occur approximately every 4 weeks and last no more than 7 days. Sometimes, periods become especially heavy and last an unusually long time.