Progesterone is a vital hormone that plays a key role in regulating the menstrual cycle, preparing the body for implantation, and maintaining a healthy pregnancy. During perimenopause, progesterone levels fluctuate, leading to symptoms like irregular periods, mood swings, and sleep disturbances. Understanding these changes and how to manage them is crucial for women's health during this transitional phase. Explore how monitoring progesterone levels can provide insights into your health and guide effective treatment strategies.