---
title: What role do brain chemicals called neurosteroids play in PMDD?
description: A key brain chemical called allopregnanolone likely triggers PMDD symptoms in vulnerable women. It acts as a sedative at high levels but can cause anxiety and
url: https://niyora.com/research/papers/neurosteroids-and-premenstrual-dysphoric-disorder-2026/
---

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- What role do brain chemicals called neurosteroids play in PMDD?

Case-control study, 2026

# What role do brain chemicals called neurosteroids play in PMDD?

A key brain chemical called allopregnanolone likely triggers PMDD symptoms in vulnerable women. It acts as a sedative at high levels but can cause anxiety and irritability at lower levels in some people.

 Early or limited evidence

Literature review comparing women with PMDD to healthy controls

## What they did

Researchers reviewed published studies about brain chemicals (neurosteroids, especially allopregnanolone) and their role in PMDD. They searched medical databases and reviewed studies comparing women with PMDD to healthy women.

## What they found

Allopregnanolone is sedative at high levels but causes anxiety and irritability at lower levels in some people, showing individual differences in sensitivity. Women with PMDD show different brain patterns and GABA receptor changes linked to allopregnanolone levels compared to healthy women. Fluctuating levels of these brain chemicals appear to worsen PMDD symptoms. Stopping ovulation (which stops these hormonal changes) helps PMDD but adding back hormones can cause mood problems in some women.

## What it means for you

PMDD may be caused by how some women's brains respond abnormally to natural brain chemicals that change throughout the cycle. This understanding could lead to better targeted treatments in the future. The research is still emerging and no fully effective PMDD treatment currently exists.

3%

of female population affected by PMDD

## About the study

Original title Neurosteroids and premenstrual dysphoric disorder Authors Bixo M, Stiernman L, Bäckström T Journal The British journal of psychiatry : the journal of mental science Year 2026 Study design Case-control study What was tested None - literature review Open access Yes Read the paper [doi.org/10.1192/bjp.2025.103](https://doi.org/10.1192/bjp.2025.103)

## Topics

[Premenstrual syndrome (PMS)](https://niyora.com/research/topics/condition-pms/)[Premenstrual dysphoric disorder (PMDD)](https://niyora.com/research/topics/condition-pmdd/)[Low mood and depression](https://niyora.com/research/topics/symptom-depression-mood/)[Anxiety and tension](https://niyora.com/research/topics/symptom-anxiety/)[Irritability and anger](https://niyora.com/research/topics/symptom-irritability-anger/)[Neurosteroids (allopregnanolone)](https://niyora.com/research/topics/treatment-neurosteroids/)[Pregnancy and postpartum](https://niyora.com/research/topics/comorbidity-postpartum/)

Research tells you what helps on average. Niyora helps on the day it hits.

Calm down, see it another way, and decide what to say, with a PMS and PMDD app built by a doctor.

## Related studies

Review, 2003

How do menstrual cycle hormones affect the brain and cause mood disorders like PMDD?

Randomised trial, 2017

Does Sepranolone reduce symptoms of severe premenstrual syndrome (PMDD)?

Case-control study, 2025

Do certain hormone-related brain chemicals predict how bad premenstrual depression and anxiety will be?

Lab study, 2023

How does allopregnanolone help with PMDD symptoms?

Randomised trial, 2023

Does a smartphone app for heart rate variability biofeedback reduce premenstrual and depressive symptoms?

Randomised trial, 2018

How do progesterone metabolites affect PMDD symptoms?

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