Your monthly menstrual cycle is an important aspect of health that every girl and woman should understand. Knowing the basics about your menstrual cycle helps you stay in tune with your body.
What is the Menstrual Cycle?
Every woman’s menstrual cycle is unique. Your cycle schedule may be different from your friends, your mother, or other women around you. Whether you're waiting for your first period (menarche) or have experienced periods for years, it’s normal to have a cycle that varies from others.
Monthly Timing of the Menstrual Cycle
Day One: The first day of your period, when bleeding begins, marks "day one" of your menstrual cycle.
Your cycle repeats with the start of your next period.
Though called a monthly cycle, it may not happen exactly once every month. The typical menstrual cycle lasts approximately 28 days but can range from 21 to 35 days depending on the individual.
If you have a shorter cycle, your period might come more frequently than monthly.
If your cycle is longer, you may have fewer periods over the course of the year.
How Hormones Regulate Your Menstrual Cycle
Your menstrual cycle is controlled by fluctuating levels of the key hormones: estrogen and progesterone.
These hormones trigger the ovary to develop and release an egg, a process called ovulation.
After ovulation, hormones thicken the lining of your uterus to prepare for a possible pregnancy.
If fertilization does not occur, the hormonal levels drop, causing the uterus lining to shed. This shedding is your menstrual period.
Each month, one ovary releases an egg, which travels down the fallopian tube. If pregnancy doesn’t happen, the egg and uterine lining leave your body during menstruation.
Why Understanding Your Menstrual Cycle Matters
Knowing your cycle helps in managing symptoms, tracking fertility, and recognizing any irregularities that might require medical advice from a gynecologist.
Learn More About Your Cycle Phases
For a detailed breakdown of your menstrual cycle phases, visit Always: Your Menstrual Cycle Phases.
Sources:
-
The American Congress of Obstetricians and Gynecologists (ACOG), Patient brochure 041
-
ACOG, Factsheet: Toolkit for Teen Care, 2nd Edition
-
ACOG, Medical Student Education Module 2008
-
Comprehensive Gynecology Review, 3rd edition; editors, Ling FW, Vontver LA, Smith RP
-
Bloom and Fawcett: A Textbook of Histology, 11th edition, by Don W. Fawcett
-
Emans, Laufer, Goldstein's Pediatric and Adolescent Gynecology, 4th edition, by S. Jean Emans and Marc R. Laufer
