What transition marks the beginning of perimenopause?

The beginning of perimenopause is characterized by hormonal fluctuations. During this transitional phase, which can last several years, a woman's body begins to produce varying amounts of estrogen and progesterone, leading to changes in menstrual cycle patterns and other symptoms. These fluctuations can manifest as irregular menstrual periods, changes in flow, and various physical and emotional symptoms such as hot flashes, mood swings, and sleep disturbances.

This fluctuation in hormone levels is fundamental to the perimenopausal experience and significantly influences how women feel and what changes they may encounter. Recognizing these hormonal changes as the hallmark of perimenopause is crucial for understanding this stage of the menopausal transition and for providing appropriate guidance and support to those experiencing it. It is during this time that individuals begin to notice the earliest signs that their reproductive function is changing, even before menstrual cycles become completely irregular or cease entirely.