Video details women's 28-day menstrual cycle
A video by Glamour Magazine details the science and symptoms of a woman's 28-day menstrual cycle. When the periods start, low estrogen levels cause fatigue and uterine cramps are experienced. Once the periods are over, estrogen levels rise, making her feel upbeat and making the skin glow. It further explains how ovulation begins around the 14th day, causing hormone changes.