Anovulation: What It Is and 3 Common Symptoms

Anovulation: What It Is and 3 Common Symptoms

5 minute read

Anovulation is when you go through an entire menstrual cycle (28 days on average) without releasing an egg for fertilization. Many significant factors can cause this anomaly.

  • Pituitary gland dysfunction
  • Premature ovarian insufficiency
  • Low body weight

However, in most cases, the causes are minor (we’ll discuss them more later on) and can be treated or even reversed. 

Note: Anovulation doesn’t happen very often but it does occur from time to time throughout your life. It may, for example, happen frequently during your first few years of menstruation—but it’s difficult to spot later on as it doesn’t always affect your period in ways you would expect. 

Today we discuss anovulation—including more on what it is and how to spot it by identifying its most common symptoms.

Ovulation (That Can Lead To Anovulation) Is a Process Not an Event

To fully understand anovulation you’ll need to grasp what goes on within your body when you are ovulating. Ovulation begins when a mature egg is released into your fallopian tube and can last up to 24 hours.

You’ll have a six-day window for fertilization at this time (4 days before the egg is released and 2 days after). If you miss this window, your body will flush the unfertilized egg and your uterine lining so you can try again.

This ‘flushing’ is known as a menstrual period. 

Fact: An average period lasts anywhere between 3 to 7 days and its appearance marks the first day of your new menstrual cycle. 

The ideal conditions required for ovulation to occur are between days 10 and 18 of your menstrual cycle. Multiple hormones are responsible for making this process a success [1]. We break them down in this table.



Gonadotropin-Releasing Hormone (GnRH)

This hormone is used to trigger ovulation by prompting the pituitary gland to release the follicle-stimulating hormone and luteinizing hormone.

Follicle-Stimulating Hormone (FSH)

Matures the follicles in one of your two ovaries.

Luteinizing Hormone (LH)

This hormone prompts the release of an egg.

Progesterone (P4)

This hormone helps to prepare the lining of your uterus for pregnancy.


Hormonal imbalances during this time result in anovulation (or no ovulation) — either because an egg was not released or the egg did not achieve maturity. 

Once you’re within childbearing age (12 to 51) you can experience anovulation. In fact—1 in every 10 persons do so. 

Anovulation is very common and can happen from time to time but chronic anovulation (no ovulation month to month for at least a year) can lead to infertility [

So, how do you spot this well-disguised phenomenon?

Common Signs and Symptoms of Anovulation


1 - Your Period Is Rarely on Time

Bleeding is usually a sign your menstrual cycle has begun [3]. However, a cycle means consistency. If your period does not start on time it may be because there was no egg, no ovulation, and therefore no prompt to begin a new cycle. 

The length of time between periods may differ from one person to another but once you find out your cycle length, it should not drastically change from month to month. Apps such as
clue can help you keep track of your monthly flow.

Irregular periods are an excellent way to spot anovulation. Why?

They allow you to identify abnormal uterine bleeding (AUB). If the length of your cycle is constantly changing by more than just a day or 2 (like a jump from 25 days to 35 and then back down to 28 then to 40), anovulation may be the cause. 

The bleeding experienced as a result of anovulation is—more often than not—due to hormone changes, which is not the same as a menstrual period (uterine wall shedding). 

Yes, you can bleed without having ovulated, which is what makes this particular phenomenon hard to spot. That begs the question: how do you know whether or not you’ve ovulated in a given month?

It’s all about the signs! [4]

  • Base temperature increase—you run a little warm due to progesterone increase.
  • Breast tenderness occurs right after ovulation due to hormone changes.
  • Your cervix changes position right before ovulation (moves higher) so there’s more room in the vagina.
  • Your libido tends to increase right before ovulation to induce fertilization.

Speaking of signs, the amount of blood you lose during your period can hint at anovulation.

2 - A Heavy Flow or Only Light Spotting

On average you should be losing anywhere between 30 to 45 millilitres of blood over the course of your period. This is the case whether it lasts 3, 5, or 7 days.

If you don’t get past 20 millilitres your bleeding is considered light (spotting) and may indicate that the shedding of your uterine wall is not the cause—if it were, there would likely be more bleeding.

The same can be said about heavy bleeding (blood loss that exceeds 80 millilitres)—your uterine lining does not cause the release of that much blood—but low levels of progesterone can.

The rate at which you soak through or fill period products such as pads, tampons, and menstrual cups can help you spot abnormal blood loss. 

However, when you use a menstrual cup it’s much easier to observe your flow. This can help you to better determine whether your flow is normal, light or leans more to the heavy side. It can also help you stay in the know if there are any sudden changes—something you can’t do with regular pads or tampons.

3 - Your Cervical Mucus Remains Thick and Minimal

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