Anovulation or absence of ovulation: causes and treatment 2026

Themenstrual cycle is essential for reproduction, and also plays an essential role in female health. It consists of a cycle of bodily changes controlled by hormones, which cause regular bleeding, which occurs monthly, and which comes from the uterus (or womb) and is finally expelled through the vagina. All of this leads to the development and release of an egg from the ovary, in a phase known as ovulation, and the growth of the endometrium - the internal lining - of the uterus. The goal? Optimize fertilization, and prepare for pregnancy.

When trying to conceive, it is normal for a woman to pay more attention to her menstrual cycle. And in order for pregnancy to occur, ovulation must first occur. Thus, when menstruation appears, it is common to assume that ovulation has occurred. And that, indeed, you are ovulating normally. But, sometimes, this is not always the case.

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In an optimal scenario, the woman's reproductive system will tend to ovulate monthly, with some regularity. But in certain situations, what is known as anovulation may arise, which basically consists of the lack or absence of ovulation in a menstrual cycle.

What is anovulation or absence of ovulation?

Anovulation simply means the lack or absence of ovulation. Since ovulation basically consists of the release of an egg from the ovary, something that occurs naturally in order to achieve pregnancy, when anovulation occurs it means that in that particular cycle, ovulation simply has not occurred.

That is, when an anovulatory cycle occurs, the woman's body has simply skipped ovulation. In other cases, when ovulation is irregular, but nevertheless not completely absent, it is known under the name ofoligo-ovulation.

In a normal menstrual cycle, the release of an egg stimulates the production of progesterone, a critical hormone that helps a woman's body maintain regular periods. However, during an anovulatory cycle, a decreased or insufficient level of this hormone can cause the appearance of heavy bleeding, and it is common to confuse this bleeding with the existence of a real period or menstrual (when in reality it would not be the case).

What are the causes of this heavy bleeding? It is a type of bleeding that, in most cases, is caused by an accumulation of blood in the lining of the uterus, which is also known as the endometrium. On the other hand, a decrease in estrogen can also influence its appearance.

Both anovulation and oligo-ovulation basically consist of two types of ovulatory dysfunction, considered a common cause of female infertility, which occurs in up to 40 percent of women with infertility.

Symptoms of anovulation

It is common for women with anovulation to experience irregular periods. Thus, if the cycles are shorter than 21 days, or longer than 36 days, it is possible that there is ovulatory dysfunction. The same is true when cycles fall within the normal range, 21 to 36 days, but cycle lengths tend to vary widely from month to month.

Let's take a simple example. If, for example, in one month the period is 22 days, but the next is 34, the existence of many variations between cycles could warn of a problem related to ovulation.

What causes anovulation?

There are several factors that can influence the existence of anovulation, or ovulatory dysfunction. The most common cause, for example, is polycystic ovary syndrome, but it is not the only related cause.

It is known that anovulatory cycles tend to be more common in those girls who have recently started menstruation, so anovulation is normal to occur within the year after the first period (menarche).

They are also common as a woman approaches menopause, as a consequence of the hormonal changes that occur during this stage, so anovulation may be slightly common in women between 40 and 50 years of age.

Likewise, other potential causes of no ovulation include:

• Too low or too high body weight (obesity)
• Practice extreme physical exercise regularly
• Certain eating habits
• High stress levels
• Premature ovarian failure
• Perimenopause (or decreased ovarian reserves)
• Hyperthyroidism (thyroid dysfunction)

How is it treated?

Medical treatment depends directly on the cause that is influencing the appearance of anovulation. Thus, some cases can be treated with diet, or with certain changes in lifestyle. This is what happens, for example, in the presence of low or high weight, or reducing the exercise routine in the event that excess physical activity is the main cause.

However, the most common treatment is fertility medications, which are specially designed to combat the cause of female infertility by maturing the follicles, increasing estrogen and helping the ovaries to be able to release the egg. This is what happens, for example, in the presence of internal imbalances.

While if the cause is polycystic ovary syndrome, insulin sensitivity medications seem to help the woman ovulate again (and also do so normally).