PMS and PMDD: Naturopathic Support for Premenstrual Symptoms and Mood Changes

What is the difference between PMS and PMDD?

PMS and PMDD both occur after ovulation, in the second half of the menstrual cycle, before your period begins.

PMS (premenstrual syndrome) can include a combination of physical and emotional symptoms such as bloating, breast tenderness, headaches, fatigue, cravings, irritability, anxiety, low mood and changes in sleep.

PMDD (premenstrual dysphoric disorder) is a more severe premenstrual mood disorder. Symptoms can include marked irritability or anger, depression, anxiety, emotional sensitivity, difficulty concentrating and a feeling of being unable to cope. For PMDD, these symptoms are severe enough to significantly interfere with daily life, relationships or work.

One of the clearest differences is severity. PMS can be uncomfortable and disruptive, while PMDD tends to have a much greater impact on mood, functioning and quality of life.

The timing is important too. Symptoms usually emerge after ovulation, become more noticeable in the lead-up to menstruation and then improve shortly after the period begins.

In PMDD, the issue does not appear to be that someone necessarily produces abnormal amounts of oestrogen or progesterone. Instead, research suggests there can be an increased sensitivity to the normal hormonal changes that occur across this part of the cycle.

This distinction matters because it changes the question from simply, “Are my hormones out of balance?” to, “Why is my body responding to these normal hormonal changes in this way?”

What can contribute to PMS and PMDD symptoms?

There isn’t one single explanation for why premenstrual symptoms become severe.

Two women can have similar hormone levels and completely different experiences before their periods. One may notice mild bloating or irritability. Another may feel anxious, depressed, exhausted, unable to sleep or as though she has become a completely different person.

The timing tells us that reproductive hormones are involved.

The rest of the pattern helps us understand what may be contributing to the severity of those symptoms.

Sensitivity to hormonal changes

This is especially important in PMDD.

Hormone levels themselves can look completely normal, yet the symptoms can be severe because the brain appears to respond differently to the normal hormonal shifts across the cycle.

This is why I look beyond whether oestrogen and progesterone are simply “in range” and pay attention to how symptoms change as those hormones rise and fall.

Progesterone, allopregnanolone and the brain

Progesterone has an interesting relationship with mood.

After ovulation, progesterone rises and is converted into several substances, including allopregnanolone. Allopregnanolone interacts with GABA, one of the brain’s major calming systems, which helps regulate anxiety, mood, sleep and the stress response.

For some women, this can be one reason the second half of the cycle feels calmer or sleep improves.

But PMDD appears to work differently.

Women with PMDD don’t necessarily have abnormal progesterone or allopregnanolone levels. Instead, research suggests the brain may respond differently to the normal rise and fall of allopregnanolone across the cycle.

This can help explain why progesterone-related changes that feel calming for one woman may coincide with anxiety, agitation, irritability, depression or feeling emotionally overwhelmed in another.

The way progesterone is taken can matter too.

Some women who feel noticeably flat, anxious or emotionally different on oral progesterone may find that another route is experienced differently. Oral micronised progesterone passes through the gut and liver first, where more of it is converted into neuroactive metabolites such as allopregnanolone.

Vaginal progesterone largely avoids this first-pass liver metabolism, creating a different hormonal and metabolite pattern. For a woman who appears particularly sensitive to progesterone-related mood changes, that can make the route of administration something worth discussing with her prescribing doctor.

It isn’t a guarantee that vaginal progesterone will be better tolerated, particularly in PMDD, because it can still influence allopregnanolone and the brain.

Sometimes the more useful question isn’t simply, “Can I tolerate progesterone?”

It’s, “Does the way I take it change how I feel?”

This is also why I don’t assume that every woman with PMS needs more progesterone. Ovulation and progesterone production can still be relevant, particularly in PMS, irregular cycles, PCOS and perimenopause, but symptoms may reflect low or inconsistent progesterone production, sensitivity to changing progesterone metabolites, or another part of the hormonal picture altogether.

Progesterone treatment is therefore not universally effective for PMS, and randomised trials have not shown consistent benefit across women as a group.

Serotonin and mood regulation

For some women, the biggest premenstrual change isn’t physical at all. It’s the sudden loss of emotional resilience.

Something that would normally be manageable suddenly feels overwhelming. You may become more tearful, anxious, reactive or withdrawn, or find that your mood drops sharply before your period.

Reproductive hormones interact with serotonin, which plays an important role in mood, appetite, sleep and emotional regulation.

This appears to be particularly relevant in PMDD, where changes in serotonin signalling are thought to contribute to the severity of mood symptoms.

The hormonal shift is therefore not occurring in isolation. It interacts with brain systems that directly influence how you feel, think, sleep, and respond emotionally.

Oestrogen and hormone metabolism

Oestrogen is another important part of the picture, but PMS should not automatically be reduced to the idea of having “too much oestrogen” or “oestrogen dominance”.

Instead, I look at the broader hormonal pattern.

Is ovulation occurring consistently? What is happening with progesterone afterwards? Are periods becoming heavier? Is there significant breast tenderness, fluid retention or a noticeable change in symptoms across the cycle?

The body also has to metabolise and eliminate oestrogen, primarily through the liver and then the gut. Differences in this process may be relevant for some women, although poor oestrogen metabolism has not been established as a universal cause of either PMS or PMDD.

When premenstrual symptoms sit alongside heavy bleeding, marked breast tenderness or other strongly oestrogen-responsive symptoms, hormone metabolism becomes one piece of the picture worth considering.

Stress and the stress-response system

You may already have noticed that your premenstrual symptoms are much worse after a month of poor sleep, relentless work, emotional strain or constantly feeling “on”.

That isn’t necessarily a coincidence.

The HPA axis (the communication system between the brain and adrenal glands) helps regulate cortisol and the stress response. It also interacts with sleep, blood sugar regulation, the nervous system and reproductive hormones.

Stress doesn’t necessarily cause PMS or PMDD, and neither condition should be reduced to a cortisol problem. But stress can certainly reduce your buffer.

When your nervous system is already under significant load, the hormonal changes before your period may feel much harder to tolerate.

This helps explain why the same woman can have relatively manageable PMS one month and much more severe symptoms the next.

Thyroid function

Thyroid dysfunction can sometimes sit alongside PMS or PMDD and make the overall symptom picture more difficult to untangle.

Thyroid hormones influence energy, mood, metabolism, sleep, menstrual regularity and ovulation, so an underactive or overactive thyroid can contribute to symptoms that overlap with premenstrual disorders, including fatigue, anxiety, depression, brain fog and cycle changes.

This becomes more relevant when those premenstrual symptoms are also accompanied by things such as unexplained weight changes, constipation, feeling unusually cold or hot, hair changes, palpitations or a strong family history of thyroid disease.

In those cases, the question isn’t whether the thyroid explains everything. It’s whether thyroid function may be adding another layer to the pattern and is worth investigating alongside the menstrual cycle.

Inflammation and histamine

Sometimes the clue isn’t one symptom. It’s the cluster.

Premenstrual mood changes may also arrive alongside migraines, headaches, flushing, nasal congestion, itching, breast tenderness, digestive symptoms or worsening insomnia.

When I see that combination, I become more interested in inflammatory signalling, histamine and mast cell activity.

Histamine may be more relevant in some women with PMS-type symptoms, particularly when there is a clear pattern of histamine-related symptoms changing across the cycle.

Its role in PMDD is less well established, so I don’t assume histamine is a core driver of PMDD. Instead, I view it as a possible amplifier when the wider symptom pattern supports it.

Blood sugar regulation

Then there is the woman who tells me that in the second half of her cycle she suddenly becomes ravenous.

She wants sugar or carbs immediately, becomes shaky or irritable if she hasn’t eaten, or notices afternoon crashes that seem much more pronounced before her period.

Those changes matter too.

Hormonal changes after ovulation can influence appetite and glucose regulation, which may be one reason cravings, hunger and energy fluctuations become more noticeable premenstrually.

Blood sugar also interacts closely with the stress-response system. If glucose drops, hormones including cortisol and adrenaline help bring it back up. At the same time, poor sleep and chronic stress can influence glucose regulation, appetite and food choices.

For someone already experiencing PMS or PMDD, this can become an additional layer of physiological stress. Irritability, anxiety, shakiness, cravings, fatigue and poor concentration caused or amplified by fluctuating glucose can overlap with symptoms that are already emerging before the period.

This is why I sometimes look beyond what someone is eating and ask what is actually happening to her energy and blood glucose across the day.

For some women, a short period of continuous glucose monitoring can be useful, particularly across the second half of the cycle. It can help show whether meals, long gaps between food, poor sleep, stress or exercise are lining up with the days symptoms are most pronounced.

A CGM isn’t necessary for every woman with PMS or PMDD, and individual glucose fluctuations don’t automatically indicate a problem. But when someone consistently experiences premenstrual crashes, intense cravings, shakiness or feeling markedly worse when hungry, it can help make an otherwise invisible pattern easier to see.

Blood sugar instability doesn’t cause PMS or PMDD on its own. But when it repeatedly overlaps with the premenstrual window, it can amplify symptoms and reduce the body’s capacity to cope with the hormonal changes already occurring.

How are PMS and PMDD diagnosed?

PMS and PMDD can both be diagnosed by a doctor or other appropriately qualified healthcare professional.

There isn’t a single blood test or hormone test that confirms either condition. Instead, diagnosis is based largely on the pattern of symptoms across the menstrual cycle – when they begin, how severe they become, how much they affect daily life and whether they improve after your period begins.

This is why tracking your symptoms across several cycles can be so useful. It helps establish whether there is a consistent premenstrual pattern and, particularly with PMDD, can help distinguish it from other conditions that may be present throughout the month but worsen before a period.

The pattern across your cycle

For PMS, symptoms usually appear in the days before your period and improve once menstruation begins.

PMDD follows a more specific and severe pattern, particularly involving mood symptoms that significantly affect relationships, work or day-to-day functioning.

One of the most important diagnostic clues is that symptoms are clearly linked to the menstrual cycle, rather than remaining at the same intensity throughout the entire month.

Why symptom tracking matters

This is where daily symptom tracking becomes incredibly useful.

Rather than trying to remember how you felt several weeks ago, recording changes in mood, anxiety, sleep, appetite, energy and physical symptoms each day can reveal exactly when the shift begins and when it lifts.

For PMDD, prospective daily symptom ratings across at least two symptomatic cycles are generally recommended to help confirm the diagnosis.

Tracking also gives us something much more useful than a list of symptoms. It shows us the story. You may discover that your anxiety consistently begins several days after ovulation, that your sleep deteriorates first, or that cravings and irritability appear before the mood changes become more significant.

Those details can help guide what we investigate next.

PMS, PMDD or premenstrual exacerbation?

Another important distinction is whether the symptoms are truly cyclical or whether an existing condition becomes worse before your period.

This is known as premenstrual exacerbation, or PME.

For example, someone with anxiety or depression may experience symptoms throughout the month but notice a significant worsening before menstruation.

That pattern is different from classic PMDD, where there is usually a clearer symptom-free or significantly improved phase during the first half of the cycle.

This distinction matters because the treatment approach may also be different.

When blood tests can still be useful

Although there isn’t a blood test that diagnoses PMS or PMDD, testing can still help answer another important question:

Could something else be contributing to the symptoms?

Depending on your history and symptom pattern, this may include investigating thyroid function, iron status, ovulation and other hormonal or metabolic factors.

The aim isn’t to run every possible test or assume every symptom needs a laboratory explanation.

It’s to use testing strategically when the pattern suggests there may be another piece of the picture worth investigating.

Why PMS and PMDD can worsen during perimenopause

Premenstrual symptoms don’t always stay the same throughout your reproductive life.

Some women have experienced PMS since their teens. Others reach their late 30s or 40s and suddenly find that the week before their period feels completely different.

Perimenopause is one of the most common times for this shift to become more noticeable.

As ovulation becomes less predictable, oestrogen can fluctuate more dramatically and progesterone production can become less consistent. For someone who is already sensitive to hormonal change, those less predictable fluctuations can make mood, sleep and premenstrual symptoms much harder to navigate.

This can be particularly confusing when your cycles are still relatively regular. You may not think of yourself as being in perimenopause, yet your PMS is lasting longer, anxiety appears before your period, sleep deteriorates or the emotional shift feels far more intense than it used to.

Changes like these are worth paying attention to, particularly when they occur alongside shorter or longer cycles, heavier bleeding, night sweats, changes in sleep or signs that ovulation is becoming less consistent.

Sometimes worsening PMS isn’t simply more of the same.

It can be a clue that the hormonal landscape itself is beginning to change.