Key Factors of Ovulation

Ovulation is one of the most important yet commonly misunderstood processes in the female body. Every week I am explaining this process to woman of every age who unsure what this process is, when it occurs, and how it impacts their health. The only education in primary school that most can remember (if you grew up in New Zealand!) is learning how to put a condom on a banana and how the contraceptive pill works. Woman are made to believe we are super fertile beings who can get pregnant every day of the month (which is simply untrue), and therefore miss out on the magic that is ovulation. A complete disservice, if you ask me.

Ovulation is the pinnacle of our cycle. It doesn't just signal that you are fertile, your ovulation window and subsequent hormone release is your monthly health report card. How well you ovulate influences your mood, sex drive, sleep, bone density, and energy throughout your cycle.

In this blog, you will learn the key factors of how ovulation happens, what can impact the likelihood of your body ovulating each month, and several key hormones required for ovulation.

How does Ovulation Happen?

Ovulation is a result of the hormonal interplay between the brain and the ovaries, often referred to as the hypothalamic-pituitary-ovarian (HPO) axis.

At the beginning of the menstrual cycle, the hypothalamus signals the pituitary gland to release follicle-stimulating hormone (FSH). This hormone stimulates the ovaries to begin maturing several follicles, each containing an immature egg. As these follicles develop, they produce estrogen, which plays a critical role in thickening the uterine lining and preparing the body for potential pregnancy. Only one follicle is ‘chosen’ each month to fully develop a mature egg.

As estrogen rises and reaches a threshold, it triggers a surge in luteinising hormone (LH). This LH surge is the key event that induces ovulation - the release of a mature egg from the dominant follicle. This typically occurs around the midpoint of the cycle, although the exact timing can vary significantly between individuals.

Following ovulation, the now-empty follicle transforms into a temporary endocrine structure known as the corpus luteum. This structure is essential as it produces the majority of our body's progesterone, a hormone that stabilises the uterine lining, supports early pregnancy if conception occurs, and exerts a calming effect on our nervous system. It also helps our skin glow, repair, reduces anxiety and stabilises our mood.

If ovulation does not occur, the corpus luteum does not form (or, if forms poorly), and progesterone production is severely impacted. Low progesterone can be responsible for most of our PMS symptoms like mood swings, insomnia, high anxiety, water retention, irregular or short cycles, and mid-cycle spotting.

Put very simply: We need to protect ovulation at all costs if we want to have: good sleep, a balanced mood, calm skin, greater conception outcomes, and a pain free asymptomatic cycle.

Ovulation is a Monthly Report Card for your Health

Ovulation is a complex physiological process that reflects the successful coordination of the brain, ovaries, metabolism, and nervous system. When ovulation occurs regularly, it is a sign that the body is receiving sufficient energy, nutrients, and safety signals to support higher-level functioning. For this reason, ovulation can be understood as a monthly report card of health - it provides real-time feedback on how well your body is functioning as a whole!

At the center of ovulation is the production of progesterone, a hormone that is only produced in meaningful amounts after ovulation has occurred. This is a critical distinction, as many of the long-term health benefits associated with the menstrual cycle are not simply due to having a period, but specifically due to ovulation and the subsequent rise in progesterone.

Bone Health

From a skeletal perspective, ovulation plays a key role in maintaining bone health. While estrogen is often emphasised in discussions around bone density, progesterone is equally important in stimulating bone formation. Research shows that progesterone directly influences osteoblast activity (the cells responsible for building bone) and contributes to the accumulation and maintenance of bone mineral density across a woman’s lifespan. 

Studies have found that women experiencing ovulatory disturbances, even with regular cycles, can lose bone density over time, highlighting that the presence of a cycle alone is not enough - consistent ovulation is required to protect long-term skeletal health. Ovulation is a protective factor against conditions such as osteopenia and osteoporosis, particularly when considered over decades.

Brain Health and Emotional Regulation

Ovulation also has significant implications for brain health and emotional regulation. Progesterone and its metabolites interact with the central nervous system, particularly through GABA receptors, exerting a calming, stabilising effect on mood and stress resilience. 

Research suggests that progesterone influences emotional processing and may play a role in modulating anxiety and stress perception. Clinically, I see this each week in woman who are not ovulating. Between client A who is ovulating (= good progesterone), and client B who is not (little to no progesterone); there is a clear difference in mood stability, anxiety, disrupted sleep, and stress resilience. 

Metabolism and Energy

Beyond mood, ovulation reflects metabolic health and energy availability. The body will not prioritise reproduction in a state of perceived scarcity. As such, consistent ovulation indicates that energy intake, blood sugar regulation, and overall metabolic signaling are sufficient. Disrupted ovulation and cycle changes are often one of the earliest signs of under-eating, chronic stress, or metabolic dysfunction. This makes ovulation a highly sensitive marker of physiological stress, often shifting before more overt symptoms arise.

Cardiovascular Health

There is also emerging evidence linking ovulatory function with cardiovascular and long-term health outcomes. Progesterone has been shown to exert protective effects on the cardiovascular system, with research suggesting that deficiencies in progesterone may contribute to an increased risk of cardiovascular disease over time.

This is why ovulation is increasingly being recognised as a vital sign of health. Much like heart rate, blood pressure, or body temperature, it provides meaningful insight into internal physiological function.

 A regular, symptom-free ovulatory cycle tells us that the body is operating in a state of balance. In contrast, absent or inconsistent ovulation is not something to dismiss or suppress - it is information, pointing towards an underlying imbalance that requires attention.

Key Factors to Track Ovulation

One of the most empowering aspects of ovulation is that it is not a secret, hidden process. Your body wants you to know! And celebrate! The body provides consistent, observable signs that reflect hormonal changes in real time. Learning to interpret these signs allows you to form a deeper connection with your body, aside from knowing that you are within your fertile window.

1. Basal Body Temperature

Basal body temperature (BBT) tracking is a well-established method for confirming ovulation. Progesterone, produced after ovulation, has a thermogenic effect, meaning it slightly increases body temperature.

To track BBT accurately, temperature should be taken first thing in the morning, before any movement, using a sensitive basal thermometer. Over the course of a cycle, a biphasic pattern should emerge: lower temperatures during the follicular phase, followed by a sustained rise of approximately 0.3–0.5°C after ovulation. Your temperature should stay elevated for your entire luteal phase. If it dips immediately after, this can signal that your corpus luteum did not progress sufficient progesterone; cue the PMS symptoms.

2. Cervical Mucus

Cervical mucus is one of the most reliable and immediate indicators of fertility and ovulation.

As estrogen rises in the lead-up to ovulation, your cervical mucus will change. It may begin as dry or minimal, then become sticky or tacky, followed by a creamy consistency. As ovulation approaches, mucus becomes clear, stretchy, and slippery - often described as resembling raw egg white.

This “egg-white” cervical mucus represents peak fertility and creates an optimal environment for sperm survival and transport. This mucus is now thin enough for sperm to travel through to the egg for fertilization. Ovulation typically occurs on the last day of this type of mucus or shortly thereafter.

Unlike temperature tracking, cervical mucus provides real-time insight into the fertile window, making it an invaluable tool for both conception and cycle awareness.

3. Mittelschmerz

In addition to temperature and cervical mucus, there are other subtle but meaningful indicators of ovulation. Some women experience mittelschmerz, a mild one-sided pelvic discomfort occurring around ovulation. Click here to watch a video captured under a microscope.

Others may notice an increase in libido, shifts in energy levels, or changes in cervical position, where the cervix becomes higher, softer, and more open.

You can also purchase LH testing strips, which allows you to track your LH surge via urine.

Factors That Influence Ovulation

Ovulation is highly sensitive to both internal physiology and external environmental inputs. From an evolutionary perspective, this makes sense! The body will not prioritise reproduction if it perceives conditions to be unsafe or insufficient. Why would our body want us bringing a child into the world if it perceives we are in a famine? Or our body is not strong or resourced enough to grow an entire human inside of us?

1. Chronic stress 

Chronic stress is one of the most significant disruptors of ovulation. Chronic stress (elevated cortisol) can arise from multiple areas of life - undereating, poor sleep, overtraining, low-grade infections, significant mental health challenges, all affect the nervous system and hormonal cascade that stimulates ovulation. If your body is receiving the daily message of “hey hi! There are not enough resources in here”, then ovulation will be shut down or delayed.

2. Excessive exercise / Overtraining 

Particularly high-intensity training without adequate recovery, can further compound this effect. Cortisol output increases with high intensity training, and can stay elevated throughout the day if there is an energy deficit and incomplete recovery. High cortisol suppresses gonadotropin-releasing hormone which then downregulates LH and FSH, preventing the trigger required to release a mature egg for fertilisation. Furthermore, consistent overtraining can lead to Low Energy Availability or Relative Energy Deficiency in Sport (RED-S).

3. Sleep 

When you lack sleep or have irregular sleep schedules, it can disrupt the hormonal surge of LH and FSH which are required for ovulation. Poor sleep also disrupts your body’s internal clock and creates physical stress, spiking cortisol and decreasing melatonin. Melatonin is a powerful antioxidant for the Oocyte (egg), when low due to poor sleep, this can compromise egg quality and its cellular health. Furthermore, poor sleep lowers leptin (the hormone that tells your brain you have enough energy), and causes a blood sugar 'roller-coaster' and can make someone acutely insulin resistant. High insulin can inflame the ovaries and raise androgen levels, blunting the LH surge required for ovulation.

4. Environmental Exposures 

Endocrine-disrupting chemicals (EDCs) are environmental chemicals that can interfere with this hormonal communication. Common examples include bisphenols such as BPA, phthalates, PFAS, parabens, certain pesticides and flame retardants, which can be encountered through plastics, food packaging, personal-care products and the wider environment.

Different chemicals can mimic natural hormones, block hormone receptors, alter hormone production and metabolism, or interfere with the signaling pathways that control ovarian function. Research suggests that certain EDC exposures can interfere with follicle development, ovarian steroid hormone production, oocyte (egg) maturation and the processes required for successful ovulation. Some may also disrupt signaling higher up the HPO axis, potentially altering the hormonal cascade required to trigger ovulation.

5. Nutrient Deficiencies

Ovulation is a metabolically demanding process, and the ovaries require an adequate supply of nutrients to support follicle development, hormone production, egg maturation and the release of a healthy egg. Key nutrients involved in healthy ovarian and reproductive function include zinc, selenium, magnesium, iron, iodine, B vitamins (particularly folate, B6 and B12), vitamin D, vitamin A, vitamin E and omega-3 fatty acids. These nutrients contribute to processes such as steroid hormone synthesis, thyroid function, cellular energy production, antioxidant defense, and normal communication along the hypothalamic–pituitary–ovarian (HPO) axis.

Adequate intake of daily calories and macros are also important. Chronic under-eating can signal to the brain that resources are insufficient for reproduction, potentially disrupting GnRH signaling, LH and FSH secretion, follicle development and ultimately ovulation.

My Last Takeaway: Ovulation is About So Much More Than Fertility!

Ovulation is not simply something that matters when you are trying to conceive. Each month, it gives us valuable insight into how well your brain, ovaries, nervous system and metabolism are communicating with one another.

A healthy ovulatory cycle requires the body to have the right hormonal signals, adequate energy and nutrients, sufficient recovery, quality sleep and an environment in which it feels safe enough to prioritise reproduction. When one or more of these areas becomes disrupted, ovulation is often one of the first processes to change.

This is why I encourage women to become curious about their cycles rather than simply viewing their period as a nuance that arrives once a month. Learn your cervical mucus patterns. Track your basal body temperature. Notice changes in your energy, mood, libido and sleep. These signs provide an incredible amount of information about what is happening hormonally beneath the surface.

And most importantly, having a regular bleed does not necessarily mean you are ovulating well. The real magic of the menstrual cycle happens with successful ovulation and the subsequent production of progesterone. If your ovulation is consistently delayed, absent or showing signs of dysfunction, the goal shouldn't simply be to suppress the symptoms. Instead, ask the bigger question:

What is my body trying to tell me?

Your cycle isn't working against you. It is communicating with you.