Menstrual cycle varies in length

The menstrual cycle does not always last 28 days and can vary from person to person, making it difficult to understand without guidance. Dr. Olivier Marpeau, a gynecologist known on Instagram as @mon.gyneco, explains the cycle's three main phases and the hormones involved.

Dr. Marpeau clarifies cycle basics

On Instagram, Dr. Olivier Marpeau aims to clarify common misconceptions about the menstrual cycle. He explains that while the cycle is often associated with 28 days, it follows a hormonal pattern in three stages, which can help identify what is normal or when medical advice is needed.

Cycle starts with menstruation

By convention, the menstrual cycle begins on the first day of menstruation and ends the day before the next period starts. This provides a reference point for tracking cycles, whether they are short, long, or irregular from month to month.

Hypophysis controls key hormones

In his video, Dr. Marpeau highlights the role of the hypophysis, a gland at the base of the brain that releases two hormones: LH and FSH. These hormones influence the ovaries and are central to the cycle's function, as they interact with the brain and ovaries to regulate the process.

Follicular phase and estrogen

Before ovulation, the follicular phase begins, during which FSH stimulates the growth of follicles in the ovaries. One follicle becomes dominant, and the ovaries primarily produce estrogen. This hormone helps thicken the endometrium, the lining of the uterus, in preparation for potential pregnancy.