The menstrual cycle is more than a period — it’s a monthly rhythm guided by hormones that affect energy, mood, pain, and inflammation. This guide explains the four cycle phases and key hormones like estrogen, progesterone, FSH, and LH to help better understand your body.

Missing school because of your period isn’t normal. This teen-friendly guide explains common signs of endometriosis and reminds you that your pain is real — and worth taking seriously.