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Why Do Periods Hurt?
During your menstrual period, your uterus contracts to help expel its lining. Hormonelike substances (prostaglandins) involved in pain and inflammation trigger the uterine muscle contractions. Higher levels of prostaglandins are associated with more-severe menstrual cramps.
What Are Period Cramps?
In this video, Justin from the Institute of Human Anatomy, shows a cross-section of the female reproductive system, and explains …
Why do women have periods?
A handful of species on Earth share a seemingly mysterious trait: a
Endometriosis
This 3D medical animation explains the normal
