Menstruation Without Ovulation (Anovulation) – Causes, Symptoms & Treatment

Periods don't always arrive at regular intervals, and the menstrual cycle doesn't always follow the classic 28-day pattern. Such fluctuations are often perfectly normal. However, if you notice highly irregular bleeding, the typical signs of ovulation are absent, or you're having difficulty conceiving, these situations may be linked to anovulation. Statistics show that up to 15% of women of childbearing age experience such cycles at some point (according to News-Medical).

In this article, you'll discover what causes anovulation, which signs to look out for and what solutions exist to help regulate your menstrual cycle and protect your reproductive health.

Periods without ovulation (anovulation) – what is it?  

Anovulation is a disorder of the menstrual cycle in which ovulation doesn't take place, meaning no mature egg is released from the ovary. Without ovulation, the body doesn't produce the hormones required for pregnancy – which can affect fertility and hormonal balance.

This phenomenon is relatively common and may occur occasionally, particularly in the first few years after your first period and during periods of considerable stress. It can, however, also indicate more serious hormonal imbalances.

Ovulation and the phases of the menstrual cycle 

The menstrual cycle is the complex process by which the female body prepares each month for a possible pregnancy. It lasts an average of 28 days and is governed by hormones, which in turn trigger a series of physiological changes.

Ovulation is the pivotal moment of this cycle: the period during which a mature egg is released from the ovary and can be fertilised so that pregnancy may occur. It is, however, just one of the phases of the menstrual cycle, which normally unfolds in four stages.

The first phase is menstruation – the stage in which the lining of the womb is shed if fertilisation hasn't taken place. It begins on day 1 of bleeding and lasts an average of 3–7 days. During this time, pads and tampons made from 100% organic cotton will help you feel protected and comfortable.

The first day of your period also marks the start of the follicular phase, which takes place between days 1 and 14 of the cycle. During this time, hormones stimulate the development of the ovarian follicles and prepare the egg for ovulation. 

The ovulatory phase generally occurs in the middle of the cycle, on day 14, when a mature egg is released from the ovary and can be fertilised by sperm. This phase lasts between 16 and 32 hours and is the window in which the chances of fertilisation are highest.

Immediately after ovulation, the luteal phase begins, during which hormones prepare the womb for a possible pregnancy. If the egg isn't fertilised, hormone levels drop and a new menstrual cycle begins.

Common causes of absent ovulation 

Ovulation is a normal physiological process that is usually present throughout the lives of all women of childbearing age. When it fails to occur, the body is signalling that some factor is interfering with its normal functioning.

Anovulation can have various causes. Sometimes it's down to hormones, sometimes to lifestyle or to conditions affecting the ovaries. Here are the most common causes:

Hormonal imbalances

Hormone levels fluctuate throughout the month and govern your entire menstrual cycle. If their balance shifts, this can also affect ovulatory function.

Hormonal imbalances are frequently associated with absent ovulation, as they can prevent the development of the ovarian follicles or the release of the egg. Changes in oestrogen, progesterone or luteinising hormone (LH) levels, raised prolactin levels, various pituitary disorders and low thyroid hormone levels are among the most common causes of absent ovulation.

Polycystic ovary syndrome 

Another major cause of anovulation, particularly in young women, is polycystic ovary syndrome. According to Oxford Academic, around 80% of women with anovulatory infertility have PCOS.

The cause of anovulation in polycystic ovary syndrome lies in the disrupted functioning of the menstrual cycle. In practice, the ovaries don't follow the normal rhythm of follicular development. The follicles don't mature properly within the ovary, none becomes dominant, and so ovulation can no longer take place.

Perimenopause and premature menopause 

Although it generally begins around the age of 50, roughly 3–4 years before the body enters the menopause, perimenopause can also start as much as 10 years before menstrual cycles cease altogether. The closer you get to the menopause, the fewer hormones your ovaries produce – which can lead to anovulatory cycles.

Similarly, anovulation may also be caused by premature ovarian insufficiency, in which ovarian function ends before the age of 40.

Stress and weight changes 

The effects of chronic stress can extend to the functioning of the hypothalamus – the region of the brain responsible for the hormones that regulate ovulation. Prolonged periods of excessive stress can therefore become a cause of absent ovulation.

Likewise, sudden weight loss or gain can disrupt hormonal balance and the menstrual cycle.

Thyroid problems 

Hypothyroidism and hyperthyroidism can affect hormone production and therefore ovulation. Thyroid disorders can thus lead to irregular or absent bleeding and to difficulty conceiving.

Eating disorders 

Eating disorders such as anorexia or bulimia can leave the body deficient in nutrients and thereby cause hormonal disturbances. In the absence of a nutrient-rich, balanced diet, they can lead to cycles without ovulation and affect fertility.

Periods without ovulation (anovulation) – signs & symptoms

Anovulation isn't always easy to spot, as it doesn't necessarily present with specific, clear-cut symptoms. In many cases, periods may continue to occur even without ovulation.

There are, however, certain signs whose presence – or indeed absence – may indicate that cycles are anovulatory. Here's what to look out for:

Irregular menstrual bleeding 

Bleeding that repeatedly arrives earlier than expected, is excessively delayed, or varies greatly in heaviness from month to month may be a sign of absent ovulation. Irregular menstrual bleeding indicates that hormonal fluctuations aren't following the usual rhythm of a cycle.

Amenorrhoea 

One of the most striking manifestations of anovulation is amenorrhoea – the complete absence of periods over several months. Absent periods may be caused by stress, hormonal imbalances or other health problems; a medical assessment is needed to determine the exact cause and the appropriate treatment.

Absence of ovulation pain 

The absence of pain during ovulation doesn't automatically mean that it hasn't taken place. Many women, however, experience mild pressure, a twinge or pain in the lower abdomen during ovulation – a phenomenon known as mittelschmerz.

If you usually experience this mid-cycle pain too and at some point notice that it's no longer there, this may be an indication that ovulation isn't occurring.

Changes in cervical mucus

Shortly before ovulation, cervical mucus becomes more abundant, thinner and stretchier in order to aid fertilisation. If you don't notice any changes in cervical mucus from one cycle to the next, ovulation may not be taking place.

No rise in basal body temperature

After ovulation, progesterone causes a slight rise in basal body temperature. If you keep a basal body temperature chart and find there's no change in temperature, this could be a sign that your cycle was anovulatory.

Absent ovulation – how is it diagnosed?

Repeatedly irregular or absent periods, as well as difficulty conceiving, should be reason enough to consult a specialist. It's worth keeping a symptom diary noting when your period starts, how long it lasts and any relevant changes over several months – this helps your doctor build as clear a clinical picture as possible.

Anovulation is diagnosed by a gynaecologist and involves several steps, from a simple medical history to specific investigations. The purpose of these investigations is primarily to confirm the diagnosis, identify the causes and determine the treatment options.

Medical history and physical examination 

Your doctor will discuss your menstrual history, the regularity of your cycles and any accompanying symptoms. At this stage, your symptom diary can be extremely helpful. This is also the time to tell your doctor about any health problems you may have.

This initial assessment is supplemented by a physical examination to identify clinical signs of hormonal imbalance such as acne, hair loss or excess body hair. It may also include a gynaecological examination.

Hormone tests 

Blood tests are crucial for confirming the diagnosis; their purpose is to measure the levels of the key hormones involved in triggering ovulation.

Your doctor may recommend tests to measure FSH, LH, oestrogen, progesterone, prolactin, thyroid hormones, androgens and anti-Müllerian hormone. Abnormal levels of these hormones can confirm the absence of ovulation.

Transvaginal ultrasound 

Using a transvaginal ultrasound, your doctor can assess the appearance of the ovaries to determine whether follicles are developing abnormally or whether ovarian cysts are present.

Your doctor can also assess the inner lining of the womb to see whether the endometrium is thickening sufficiently for a possible pregnancy. Normally, the endometrium changes after ovulation; the absence of these changes can confirm anovulation.

Monitoring basal body temperature 

Your doctor may recommend taking your basal body temperature every morning immediately after waking. In a healthy menstrual cycle, you should notice a slight rise in temperature in the days following ovulation. The absence of this change may indicate that ovulation hasn't taken place.

Progesterone test 

Progesterone levels rise markedly after ovulation. For this reason, your doctor may recommend a blood test in the second half of the cycle to measure progesterone levels. A low level may indicate that ovulation hasn't occurred – it's one of the most important markers in diagnosing anovulation.

Absent ovulation – long-term risks and complications 

One immediate consequence of long-term absent ovulation is the inability to conceive – but the effects aren't limited to fertility. Untreated anovulation can also be associated with hormonal imbalances and complications for general health. The most common associated risks include:

Infertility 

Without ovulation, no egg is released that could be fertilised – making pregnancy impossible. For this reason, anovulation is one of the leading causes of infertility in women of reproductive age.

Chronic hormonal imbalances 

Absent ovulation goes hand in hand with an imbalance between oestrogen and progesterone levels – two hormones that play an essential role in reproductive health and beyond. If this imbalance persists, it can in turn produce numerous symptoms, such as acne, weight gain, thinning hair and hair growth in unusual places.

Increased risk of endometrial hyperplasia 

Normally, progesterone levels in the body rise after ovulation and halt the thickening of the womb lining.

If ovulation doesn't occur, however, progesterone levels may remain low. As a result, the endometrium continues to thicken under the influence of oestrogen, which can lead to excessive thickening of the womb lining – known as endometrial hyperplasia.

Risk of osteoporosis 

Persistent anovulation can be associated with low oestrogen levels – a hormone that is important for maintaining bone density. Women with frequent anovulatory cycles therefore have an increased long-term risk of osteoporosis and fractures.

Treating anovulation (periods without ovulation) 

Because the causes of anovulation can vary so widely, treatment is recommended by a specialist according to each patient's individual situation.

In many cases, absent ovulation is the result of a condition that can be improved with the right treatment, restoring fertility and quality of life. In other cases, where anovulation is due to stress or lifestyle, your doctor can advise on possible improvements.

These are the main treatment options:

Ovulation induction

Ovulation induction is often the first step in treating this disorder. It involves medication that helps the ovaries to develop and release an egg. This treatment is particularly recommended for women who wish to conceive and who are facing infertility due to anovulation.

Hormone therapy

Patients whose ovulation is absent due to a hormonal imbalance may be offered specific treatments with oestrogen or progesterone, as well as therapies to regulate prolactin or thyroid hormone levels. The aim of treatment is to help restore a normal menstrual cycle.

Surgical procedures 

In certain cases, such as polycystic ovary syndrome or other structural problems, surgery may be recommended to improve ovarian function.

Assisted reproduction techniques 

There are situations in which treatments produce no results and ovulation continues to be absent. If a patient wishes to conceive and isn't ovulating, in vitro fertilisation (IVF) or other assisted reproduction procedures can offer a genuine chance of pregnancy.

Lifestyle changes

Managing stress, maintaining a healthy body weight, eating a balanced diet and taking regular physical exercise can all have a positive effect on ovulation. In some cases, these simple changes can help restore hormonal balance and bring about the return of ovulation.

Anovulation (periods without ovulation) – can it be prevented?  

The causes of anovulation can be many and varied, and not all of them can be influenced. Genetic causes and certain conditions, for example, cannot be prevented.

There are, however, some measures that can reduce the risk of anovulation. These essentially relate to lifestyle and include:

• Maintaining a healthy body weight
• Eating a nutrient-rich, balanced diet
• Limiting your intake of sugar and ultra-processed foods
• Not smoking and consuming alcohol and caffeine only in moderation
• Taking regular, moderate physical exercise
• Managing stress through rest and relaxation techniques
• Avoiding contact with toxic chemicals

• Monitoring your general health with regular check-ups.

  Frequently asked questions about menstrual cycles without ovulation 

We know: questions and worries simply take over when your menstrual cycle doesn't work the way you expect. And only your doctor, who knows your history and your current state of health, can give you the most relevant answers. To help put your mind at ease until your appointment, we've gathered answers to some of the most common questions about periods without ovulation:

How can you tell if you're having an anovulatory cycle? 

Common signs of anovulation include highly irregular bleeding, the absence of typical ovulation symptoms (such as changes in cervical mucus) and difficulty conceiving. These don't automatically confirm absent ovulation, however. Only a doctor can make a proper diagnosis following the appropriate investigations.

Can you get pregnant if you're not ovulating? 

No – without ovulation, pregnancy isn't possible, because there's no egg available to be fertilised. If you want to conceive but are dealing with anovulation, talk to your doctor about treatment options that can stimulate ovulation and increase your chances of fertilisation.

What's the connection between polycystic ovary syndrome and absent ovulation? 

Polycystic ovary syndrome is one of the leading causes of anovulation and is found in more than 80% of young women with anovulatory infertility. In affected patients, the ovarian follicles don't mature fully, which prevents the release of the egg.

Are there hormone treatments for absent ovulation? 

Yes, there are – and the appropriate treatment is recommended by a specialist according to the cause of the anovulation. Current options include oestrogen and progesterone therapy, as well as treatments to regulate prolactin or thyroid hormone levels.

How long does treatment for an anovulatory cycle take?

The duration of treatment depends on the cause and on how the body responds. In some cases, ovulation can be restored within a few months. There are also situations, however, in which the patient requires longer-term monitoring and treatment.

Does absent ovulation affect fertility in the long term?

Yes. Without treatment, anovulation can be associated with infertility and other long-term complications such as endometrial hyperplasia and osteoporosis. With the right diagnosis and appropriate treatment, however, many women regain their fertility and are able to fulfil their wish to have children.

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