follicular phase

The follicular phase is the first stage of the menstrual cycle, beginning on the first day of menstruation and lasting until ovulation. During this phase, follicles in the ovaries mature under the influence of follicle-stimulating hormone (FSH), leading to the development of a dominant follicle that will release an egg. This phase is crucial for hormonal regulation and reproductive health, as estrogen levels rise to prepare the uterine lining for potential pregnancy. Understanding the follicular phase is important for tracking fertility and managing menstrual health.