When does the proliferation phase of the endometrial cycle begin?

The proliferation phase of the endometrial cycle begins after menstruation ends. During this phase, the endometrium, or uterine lining, is restored and rebuilt in preparation for a potential pregnancy. Following menstruation, which marks the shedding of the old endometrial tissue, estrogen levels rise as the ovarian follicles develop. This increase in estrogen stimulates the growth and thickening of the endometrial lining, allowing it to become more receptive for a fertilized egg if conception occurs.

This phase lasts until ovulation occurs, at which point the endometrium reaches its peak thickness and is ideally prepared to support a fertilized ovum. Understanding the timing of these phases is crucial for grasping the menstrual cycle's influence on fertility and reproductive health.