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.
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
Topics
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