Back To The Basics: What Is A Menstrual Cycle?


art by Courtney Davis

Many of us took a class back in grade school where we learned the correct anatomical names of our reproductive organs, squirmed in our seats as the teacher held up colorful diagrams of a flaccid penis and tried not to laugh when we were lectured to about the changes that occur during the menstrual cycle. Some of us did what we could to score well on the quizzes and tests required to pass the course and never gave our reproductive organs a second thought.

Sadly, outside of school there really aren’t many opportunities to learn about or discuss our reproductive bodies. I feel this is because in these awkward grade school health classes we inadvertently teach kids to be embarrassed. And that reality, my friends, is harmful to our knowledge and our health. So much so that in 2014 the Daily Mail published a story discussing a survey that showed, “half of 26 to 35-year-olds were unable to correctly identify a vagina on a medical diagram of the female reproductive system.” Um, what?

I believe passionately that we cannot live healthy lives unless we understand the nuances of our bodies and nothing is more nuanced than the menstrual cycle. In our over-medicated world many women choose to use hormonal birth control as a way to control their cycles, which I support, but it is still important to know how and why our bodies do what they do every month. So today let’s get back to the basics on women’s health and talk about the fantastic menstrual cycle. And I promise, no colorful diagrams. OK, maybe one colorful diagram.

First thing’s first. The menstrual cycle can last anywhere from 21 to 35 days with the average length being 28 days, with the first day of your period being day one.* This monthly cycle is divided into four distinct phases: menstruation, follicular phase, ovulation and the luteal phase.

phases of the menstrual cycle | chart via

Phase One: Menstruation

Menstruation occurs when the level of the hormone progesterone dips significantly (progesterone is the hormone responsible for maintaining pregnancy). For most women, bleeding during menstruation can last anywhere from 2-7 days. Many women experience light brown spotting before their period officially begins, see a gradual increase in flow over the course of a few days which then subsides with some more spotting. Some women start and end bleeding without the warm-up and cool-down which is why they bleed for less days (I am not one of those women). During the menstrual cycle we will shed 2-4 tablespoons of vibrant, nourishing blood.

Phase Two: Follicular

Once menstruation ends, the hormone estradiol begins to stimulate our ovaries. It is in this phase a teeny, tiny follicle develops (sometimes two, or three!) and acts as a “hallway” through which a mature egg will pass. This phase lasts around a week. Fun Fact: most girls are born with all of the eggs they will ever have, which are millions. So if you think about it, your maternal grandmother actually carried you when she was pregnant with your mom. Fascinating! Anyway, those millions of immature follicles, through puberty and young adulthood, get paired down to around 200-400 eggs. Unlike boys and men who can continue to produce sperm well into late adulthood, a woman has a finite number of eggs.

Phase Three: Ovulation

Phase three is possibly one of the most critical stages: ovulation. Ovulation is when that mature follicle discussed in phase two breaks through the surface of our ovary and is released into our fallopian tube. During this phase, estrogen is produced in the maturing ovary from which some women experience mild side effects: tender breasts or light cramping are common. Light spotting is also possible. This phase typically occurs between days 12 and 18 of the cycle.

At this phase in your cycle you may notice you become very interested in sex. You may also notice an abundant clear discharge in your underwear or when you use the bathroom. This is completely normal and is your body’s way of telling you you’re fertile. This clear discharge is coming out of your cervix and has a PH balance that is friendly to sperm and actually helps them swim more quickly. At this point in your cycle the uterine wall has already begun to thicken in preparation to accept and nourish a fertilized egg. Shockingly, the mature egg only lives for 12-24 hours after it is released from the ovary. If healthy sperm are not there to meet the egg it dissolves and is absorbed into the lining of the uterus.

Phase Four: Luteal Phase

At this point the left over follicle in your ovary turns into what is called the corpus luteum and triggers your body to produce progesterone. Progesterone helps sustain the uterine wall and is responsible for all those lovely PMS symptoms we may experience: bloating, tender and swollen breasts, cramping, mood swings, fatigue, headaches, etc. The luteal phase lasts around two weeks during which, the egg floats down to the uterus and, if fertilized, burrows into the uterine wall where the corpus luteum continues to produce progesterone into the 10th week of pregnancy until the placenta can take over. If you do not become pregnant during the luteal phase your progesterone levels will dip. This dip will trigger menstruation and you will find yourself back in phase one.

There you have it, a straight forward chat about what a menstrual cycle is: an incredibly coordinated effort of hormones and communication between body systems. It really is an amazing thing, that menstrual cycle. Whether you are trying to become pregnant, avoid pregnancy, a young girl experiencing her first menstrual cycle or just a woman who wants to feel more connected to her body, our menstrual cycle is truly something we should appreciate. Now that we know the basics we can go deeper into some of the really cool things our bodies do each month. Stay tuned!

P.S. There are really fun ways to track your menstrual cycle. You can wear “menstrual beads,” use pretty charts, download fun apps or have an arts and crafts day with your gal pals and make menstrual wheels. Get to know your cycle and let your personal style help you celebrate it!

*Note: these are the basics. Many women experience menstrual irregularities which we will be covering in more depth soon!

Amy Sutherland is a period-positive advocate and graduate student at the University of Minnesota where she is currently researching and writing her thesis on how menstrual stereotypes and stigmas affect health outcomes in women and girls. Read her full bio here

Read more articles by Amy Lembcke


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  2. The Magic Of Menstrual Blood And Why It’s So Much More Than Just Blood | Cycledork
  3. How To Reduce Cyclical Breast Tenderness Holistically | Cycledork
  4. How to Reduce Cyclical Breast Tenderness Holistically | Quit The Pill
  5. Know Your Cervical Fluid: In Charge Of Your Discharge | Cycledork

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