The three stages of the menstrual cycle are: Follicular stage What are the stages of the menstrual cycle? A normal cycle varies from 21-40 days, with the average being 28 days. This stage begins on the first day of menstruation. Your body releases follicle-stimulating hormone (FSH), and ovarian follicles start developing. OvulationĪt this point, your body produces luteinizing hormone (LH), and the follicle releases an egg that survives for up to 24 hours, waiting to be fertilized. ![]() Luteal stageĪfter ovulation, estrogen declines, and progesterone levels increase. Progesterone stimulates the growth of the uterine lining, which can house a fertilized egg. If fertilization doesn't occur, progesterone levels start dropping. The menstrual phase is part of the follicular stage. During this stage, your body understands that it's not pregnant. It starts discarding the unnecessary lining and getting ready for the next ovulation. The menstrual part of the follicular stage lasts around five to seven days. Researchers have done several studies to determine the cause of poor sleep quality during the luteal phase. ![]() Around 66%³ of women with PMDD say they have trouble falling and staying asleep several days before their period. ![]() While poor sleep quality is a symptom of severe PMS, scientists are yet to discover why.
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