Health Library
The Health Library is a collection of health and wellness resources created for learning and accessibility. Select a topic below for related health information or search for a topic in the search bar for more information on other medical conditions.
Amenorrhea
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The menstrual cycle is the series of changes a woman's body goes through to prepare for a possible pregnancy. Most girls start having periods between the ages of 11 and 15. A girl who has not had her first period by age 15 has what is called primary amenorrhea. This is different from infrequent or light menstrual...
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If you participate in endurance sports, you may miss periods or stop menstruating. This is called secondary amenorrhea, and it occurs because your ovaries are not producing enough estrogen. It is believed that stress and low body fat contribute to amenorrhea. This is more likely to happen if you are younger and if your...