Why PMS and PMDD Feel So Different for Different Women: The Science Behind Hormone Sensitivity and Personalised Treatment
If you’ve ever thought, “Why does progesterone help my friend but make me feel awful?” or “Why do my symptoms hit before my period, but someone else struggles all month?”—you’re asking exactly the right question.
For years, PMS and PMDD were described as hormonal conditions caused by “too much” or “too little” of certain hormones. But the science has moved on.
We now understand something much more nuanced—and much more empowering:
It’s not just about your hormone levels. It’s about how your brain responds to them.
The key shift: from hormone levels to hormone sensitivity
In PMS and PMDD, hormone levels are usually normal.
The difference lies in:
how your brain responds to progesterone and oestrogen
how sensitive you are to hormonal change
and how your nervous system adapts (or struggles to adapt) across your cycle
This explains why two women with identical hormone levels can have completely different experiences.
Why symptoms vary so much: emerging “patterns” in PMS and PMDD
Although medicine hasn’t yet formally defined subtypes, research and clinical practice increasingly point to different biological patterns.
Understanding these can be transformative.
1. Progesterone-sensitive pattern (“I feel worse after ovulation”)
Some women feel significantly worse as soon as progesterone rises after ovulation.
You might recognise this if:
your mood drops in the second half of your cycle
symptoms last most of the luteal phase
you feel better once your period starts
This is linked to how your brain responds to allopregnanolone, a calming neurosteroid derived from progesterone.
In some women, instead of calming the nervous system, it can paradoxically trigger:
anxiety
irritability
agitation
This is one of the best-supported mechanisms in PMDD research.
2. Hormone-withdrawal pattern (“I crash just before my period”)
Others feel relatively stable until just before their period.
You might notice:
a sudden drop in mood in the last few days before bleeding
rapid improvement once your period starts
This reflects sensitivity to the drop in progesterone and oestrogen, which leads to a fall in calming neurosteroids.
For these women, the issue isn’t the hormone itself—it’s the withdrawal.
3. Oestrogen-responsive pattern (“I feel better when things are stabilised”)
Some women improve significantly with:
transdermal oestrogen
continuous contraception
cycle suppression
Why?
Oestrogen:
supports serotonin function (our key mood neurotransmitter)
reduces hormonal fluctuation
stabilises brain signalling
This pattern often overlaps with:
anxiety
low mood
perimenopause transitions
4. Progesterone-beneficial pattern (“Progesterone actually helps me”)
This is less talked about—but very real.
Some women:
sleep better with progesterone
feel calmer and less anxious
benefit from cyclical progesterone
This likely reflects a different GABA response, where progesterone’s calming effects work as expected.
5. The “moderate dose problem”: why some women react to certain doses
One of the most fascinating findings in recent research is this:
Progesterone’s effects on the brain are not linear.
Instead, they follow an inverted U-shaped curve:
Low levels → minimal effect
Moderate levels → can trigger anxiety/irritability in sensitive individuals
High levels → sedating and calming
This explains a common clinical experience:
“I felt awful on that dose of progesterone—but fine on a lower or higher dose.”
It’s not in your head. It’s neurobiology.
So what’s actually happening in the brain?
The key player is a neurosteroid called allopregnanolone, derived from progesterone.
It acts on the GABA-A receptor, the brain’s main calming system.
In PMS/PMDD:
this system doesn’t respond typically
receptors may adapt differently across the cycle
the same hormone signal can produce very different emotional effects
This is why:
some women feel sedated
others feel anxious
and some feel both at different times
Why this matters: moving towards personalised treatment
This new understanding changes everything.
Instead of a “one-size-fits-all” approach, we can begin to tailor treatment based on your pattern.
Treatment may include:
SSRIs (continuous or luteal-phase only)
Ovulation suppression (COC or GnRH analogues)
Transdermal oestrogen to stabilise fluctuations
Carefully selected progesterone regimens (type, dose, timing all matter)
Nervous system support (sleep, stress, trauma-informed care)
The key is not just what you take—but how your body responds.
The future: will genomics help?
Research is now exploring:
genetic differences in hormone sensitivity
how brain receptors respond to neurosteroids
links with ADHD, anxiety, and mood disorders
In the future, we may be able to:
predict which treatment will work for you
avoid trial-and-error prescribing
identify your “hormone sensitivity profile” early
But for now, the most powerful tool is still:
careful listening, pattern recognition, and personalised care.
You’re not “failing” treatment—your biology is unique
If you’ve tried treatments that didn’t work—or made you feel worse—it doesn’t mean:
you’re imagining it
you’re “hormonal” in a vague way
or that nothing will help
It often means:
you haven’t yet had treatment tailored to your specific pattern.
How Sirona Health can help
At Sirona Health, we take a precision, whole-person approach to PMS and PMDD.
We work with you to:
map your symptoms across your cycle
identify your likely biological pattern
tailor treatment to your physiology—not just guidelines
support both hormonal and psychological aspects of care
Because your experience is real—and it deserves a personalised approach.
FAQ
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Not in the traditional sense. Hormone levels are usually normal. The issue is how your brain responds to normal hormonal changes.
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Some women have increased sensitivity to progesterone-derived neurosteroids, which can cause anxiety or irritability instead of calm.
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This suggests hormone withdrawal sensitivity, where the drop in hormones triggers symptoms rather than the levels themselves.
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Yes—but the type, dose, and regimen matter enormously. Some forms help, others worsen symptoms. This is where personalised care is key.
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Because progesterone has a non-linear effect on the brain. Moderate doses can sometimes trigger symptoms, while lower or higher doses are better tolerated.