1. Early Menstruation Lowers Odds of Surviving Ovarian Cancer - US News and World Report
Patients who had first period before age 12 are at increased risk of death, study shows

2. Heavy Periods May Be Due to a Clotting Disorder - US News and World Report
Women and doctors should watch for signs of excessive blood loss, experts say

3. Menstruation - absent  (Trust Mark: Doctor-Reviewed)
Absent menstruation means no menstrual flow, or period. Absent menstruation may be: Primary - no menstruation before age 16; Secondary - menstruation begins at the appropriate age, but later stops for more than 3 cycles or 6 months. Absent menstru...• Reviewer: Susan Storck, MD, FACOG, Clinical Teaching Faculty, Department of Obstetrics and Gynecology, University of Washington School of Medicine; Chief, Eastside Department of Obstetrics and Gynecology, Group Health Cooperative of Puget Sound, Redmond, Washington. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

4. Menstruation  (Trust Mark: Doctor-Reviewed)
Menstruation refers to the monthly discharge through the vagina of the blood and tissues that were laid down in the uterus in preparation for pregnancy .• Author: Belinda Rowland, Rebecca J. Frey PhD