Progesterone: The Hormone We Don't Talk About Enough

When we talk about menopause hormones, oestrogen usually gets most of the attention. 

But progesterone deserves a place in the conversation too.

Progesterone is an important reproductive hormone that changes throughout a woman's life. It plays a key role in ovulation, the menstrual cycle and pregnancy, and it also has effects throughout the body.

During perimenopause, progesterone production can become less predictable as ovulation becomes less consistent. For some women, this is part of the changing pattern of their periods and symptoms.

Understanding what progesterone does, how it changes during the menopause transition, and where progesterone-containing treatments may fit into care can help you have a more informed conversation about your options.

What Does Progesterone Do?

Progesterone is produced primarily by the ovaries after ovulation. Its most well-established roles are related to the menstrual cycle and reproductive health. 

Progesterone helps to:

• Prepare the lining of the uterus for a potential pregnancy after ovulation
• Support the menstrual cycle by contributing to the hormonal changes that occur during the second half of the cycle
• Support pregnancy in its early stages
• Balance the effects of oestrogen on the endometrium, which becomes particularly important when oestrogen is prescribed as part of menopausal hormone therapy

Progesterone also interacts with the brain and nervous system, which may help explain why some women notice changes in how they feel across different stages of their menstrual cycle.

However, it's important not to assume that every symptom experienced during perimenopause is caused by low progesterone.

Hormonal changes during this stage are complex, and oestrogen, progesterone and other biological and lifestyle factors can all contribute to how you feel.

How Progesterone Changes During Perimenopause

During the reproductive years, progesterone rises after ovulation. 

As you enter perimenopause, ovulation can become less frequent or less predictable. When ovulation doesn't occur, the usual rise in progesterone doesn't happen in the same way.

This means progesterone levels can become more variable during the menopause transition.

You may notice changes such as:

• Periods becoming shorter, longer, heavier or more irregular
• Changes in premenstrual symptoms
• Breast tenderness
• Changes in sleep
• Mood changes
• Headaches or migraines around your cycle

These symptoms can have many possible causes, so they shouldn't automatically be interpreted as evidence of progesterone deficiency.

This is where looking at your symptoms and menstrual history in context becomes much more useful than focusing on a single hormone level.

What Happens to Progesterone After Menopause?

After menopause, ovulation stops and the ovaries no longer produce the cyclical levels of progesterone seen during the reproductive years. 

This is a normal part of the menopause transition.

It doesn't necessarily mean that every woman needs progesterone replacement.

Instead, whether progesterone or another progestogen forms part of your treatment depends on your individual circumstances and, importantly, whether you are using oestrogen as part of menopausal hormone therapy.

For women who have a uterus and use systemic oestrogen, a progestogen is generally prescribed alongside it to protect the lining of the uterus from excessive stimulation.

Progesterone, Sleep and Mood

Sleep and mood can change significantly during perimenopause and menopause. 

Progesterone and its metabolites interact with receptors in the brain, including pathways involving GABA, which is one reason progesterone has attracted interest in relation to sleep and mood.

Some women report changes in sleep or how they feel across their menstrual cycle, and some may notice improvements when appropriate menopausal hormone therapy is introduced.

But this doesn't mean that progesterone is a universal treatment for insomnia, anxiety or low mood.

Sleep disruption, vasomotor symptoms, stress, mental health, medications and other health conditions can all contribute.

The important question is not simply “Is my progesterone low?”

It's:

“What's contributing to my symptoms, and what treatment options are appropriate for me?”

Progesterone and HRT

If you're considering menopausal hormone therapy, understanding the role of progesterone is particularly important. 

Menopausal hormone therapy may contain:

• Oestrogen alone, generally used when a woman doesn't have a uterus
• Oestrogen plus a progestogen, generally used when a woman still has a uterus

The progestogen component provides protection for the endometrium when systemic oestrogen is used.

There are several types of progestogens available, including micronised progesterone, as well as other progestogens used in MHT. The choice depends on your medical history, symptoms, preferences, treatment regimen and individual risk factors.  

MHT can also be prescribed using different schedules, including continuous or cyclical regimens depending on whether you're in perimenopause or post-menopause and your individual circumstances.  

This is why choosing the right treatment isn't simply about replacing a hormone.

It's about understanding which hormones are needed, why they're being used, how they're delivered and how your treatment will be monitored.

Do I Need a Progesterone Test? 

This is an important question, particularly if you're experiencing symptoms during perimenopause. 

Hormone levels naturally fluctuate during the menopause transition, which means a single progesterone result may not provide a complete picture of what's happening.

For women over 45 with typical menopausal symptoms, routine hormone testing is generally not required to diagnose perimenopause or menopause. Assessment is usually based on your symptoms, menstrual history and clinical circumstances.  

There are circumstances where hormone testing may be useful, particularly when the diagnosis is unclear or there are other clinical considerations.

That's why testing should be guided by your individual situation rather than ordered simply because you're experiencing symptoms.

When Might Progesterone Be Part of Your Treatment Plan? 

Progesterone or another progestogen may be considered in different circumstances, including as part of MHT for women with a uterus who are using systemic oestrogen. 

Your treatment may also need to take into account:

• Whether you're still having periods
• Your stage of the menopause transition
• Whether you have a uterus
• Your symptoms and treatment goals
• Your medical and family history
• Previous experiences with hormone therapy
• Other medications and health conditions

The goal is not to chase a particular progesterone number.

It's to choose treatment that is appropriate, evidence-based and suited to your individual circumstances.

Supporting Your Hormonal Health Beyond Progesterone 

Hormones are only one part of the picture. During perimenopause and menopause, supporting your overall health can also include:

Nutrition

A balanced diet with adequate protein, fibre and a wide range of nutrient-dense foods can support overall health and metabolic wellbeing.

Movement and strength training

Resistance exercise can help support muscle strength, bone health and physical function as you move through midlife.

Sleep

Addressing night sweats, sleep habits, stress and other contributors can make a meaningful difference to how you feel.

Stress and mental wellbeing

Ongoing stress can affect sleep, mood, energy and quality of life, so it deserves attention alongside physical symptoms.

Regular health reviews

Your health needs can change throughout perimenopause and beyond. Regular reviews can help ensure your treatment continues to be appropriate.

It's Not About Finding the “Perfect” Hormone Balance

There is no single progesterone level that defines how every woman should feel. 

Your hormones naturally change throughout your life, and the menopause transition is no exception.

If you're experiencing changes in your periods, sleep, mood or wellbeing, it's worth looking at the bigger picture rather than assuming one hormone is responsible.

And if you're considering MHT, understanding the role of progesterone can help you have a much more informed conversation about your options.

Understanding Your Options Starts With the Whole Picture

Progesterone plays an important role in reproductive health and can also form an important part of menopausal hormone therapy for some women. 

But good menopause care isn't about testing every hormone or automatically replacing what's “low”.

It's about understanding your symptoms, your health history, your stage of menopause and your goals, then considering the evidence-based options that may be appropriate for you.

If you're wondering whether progesterone, MHT or another approach could be right for you, book a consultation with My Menopause Clinic Australia.

Together, we can look at the whole picture and develop a plan that's appropriate for your body, your symptoms and your stage of life.