19/09/2026
PMDD isn't simply a "hormone imbalance."
Here's something really interesting about PMDD...
Your hormones can be completely normal, but your brain can respond very differently to the hormonal changes that happen throughout your cycle.
One of the key players is allopregnanolone (ALLO) — a neurosteroid made from progesterone.
Here's the simple version:
💮 After ovulation, progesterone rises.
🧠 Progesterone is converted into ALLO.
🧠 ALLO interacts with GABA-A receptors in the brain, which are involved in regulating things like anxiety, stress and emotional responses.
Then your period approaches...
📈 Progesterone falls.
📈 ALLO falls
And your brain needs to adapt to that change. For most women, this happens without much trouble. But in PMDD, research suggests that the brain's GABA-A receptor system may not adapt normally to these hormonal fluctuations.
And this may contribute to:
😡 Irritability
😭 Mood swings
😵 Anxiety
🧠 Brain fog
😔 Low mood
🔥 Feeling completely overwhelmed
And here's the really important bit...
It may not be that your hormones are "too high" or "too low."
It may be that your brain is unusually sensitive to the change in hormones.
Think of it like this:
Your hormones are changing the volume 🔊
But in PMDD, the brain's sound system may be more sensitive to the volume change. This is why someone can have completely "normal" hormone levels and still experience severe, cyclical symptoms. And it helps explain why PMDD is so much more complicated than simply testing your hormones and saying: "Your results are normal."
We're looking at the interaction between:
🌸 Reproductive hormones
🧠 Neurosteroids
🧠 GABA-A receptors
🔥 Stress response
🧠 Nervous system sensitivity
PMDD isn't imaginary. And it's not simply "being more emotional before your period."
There are real biological mechanisms being investigated—and we're learning more about them all the time. 🤍