Menstruation is a woman's monthly bleeding, often called your “period.” When you menstruate, your body discards the monthly buildup of the lining of your uterus (womb). Menstrual blood and tissue flow from your uterus through the small opening in your cervix and pass out of your body through your vagina.
But PMS symptoms are closely linked to changing levels of estrogen, serotonin, and progesterone: Estrogen rises during the first half of the menstrual cycle and drops during the second half. In some women, serotonin levels stay mostly steady. But in women with PMS, serotonin drops as estrogen drops.
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Answer:
Menstruation is a woman's monthly bleeding, often called your “period.” When you menstruate, your body discards the monthly buildup of the lining of your uterus (womb). Menstrual blood and tissue flow from your uterus through the small opening in your cervix and pass out of your body through your vagina.
Answer:
The PMS cycle
But PMS symptoms are closely linked to changing levels of estrogen, serotonin, and progesterone: Estrogen rises during the first half of the menstrual cycle and drops during the second half. In some women, serotonin levels stay mostly steady. But in women with PMS, serotonin drops as estrogen drops.