--- title: How do hormones change the brain across the menstrual cycle? | Niyora description: The brain does change in measurable ways across the cycle, especially in how different brain areas communicate with each other. These changes are modest but c url: https://niyora.com/research/papers/ovarian-hormone-fluctuations-across-the-menstrual-cycle-effects-on-brain-2026/ --- - [Niyora](https://niyora.com/) - [Research](https://niyora.com/research/) - [Library](https://niyora.com/research/library/) - How do hormones change the brain across the menstrual cycle? Study, 2026 # How do hormones change the brain across the menstrual cycle? The brain does change in measurable ways across the cycle, especially in how different brain areas communicate with each other. These changes are modest but can even predict which cycle phase a woman is in. Moderate study design Review of research on hormones and brain changes across the menstrual cycle ## What they did This paper summarizes research findings about how ovarian hormones (estrogen and progesterone) affect brain structure and function at different points in the menstrual cycle. ## What they found Brain volume changes happen during ovulation and the luteal phase. The strongest changes occur in how brain areas communicate. These patterns are consistent enough to predict which cycle phase a woman is in. However, each woman experiences premenstrual symptoms differently. ## What it means for you The brain definitely responds to hormone changes across the cycle in ways we can measure. However, these brain changes are modest, and they don't fully explain why symptoms vary so much between women. More research is needed to understand how brain changes connect to actual premenstrual symptoms. 2 brain regions with volume changes ## About the study Original title Ovarian hormone fluctuations across the menstrual cycle, effects on brain structure and function, and affective psychopathology Authors Belinda Angela Pletzer Journal European Psychiatry Year 2026 Study design Study Open access Yes Read the paper [doi.org/10.1192/j.eurpsy.2026.10328](https://doi.org/10.1192/j.eurpsy.2026.10328) Original abstract Abstract The menstrual cycle represents a unique opportunity to study the effects of ovarian hormones on the brain given the distinct peaks of estradiol and progesterone in the ovulatory and luteal cycle phase. Evidence of neuroplastic effects of estradiol at the cellular level is reflected in hippocampal volume changes during the ovulatory phase, while progesterone increases during the luteal phase relate to changes in basal ganglia volumes. Likewise fronto-striatal activity increases with progesterone during the luteal phase across a variety of tasks and imaging modalities. Nevertheless these changes in brain structure and activity remain very modest in effect size. More impressive however are changes in brain connectivity, which have been replicated across a variety of methods and modalities. While cognitive performance remains relatively stable along the menstrual cycle, neural networks adapt to changing hormonal milieaus, shaping new pathways for information through the brain. These changes may even be strong enough to predict a woman’s cycle phase from her brain connectivity patterns. However, mental health trajectories along the menstrual cycle are highly individualized reflected in premenstrual symptomatologies. The talk will characterize the female brain across different menstrual cycle phases and summarize behavioral evidence related to premenstrual symptom trajectories along the menstrual cycle. Finally it will discuss a road forward to linking the two phenomena. Disclosure of Interest None Declared Reproduced under CC-BY. ## Topics [Premenstrual syndrome (PMS)](https://niyora.com/research/topics/condition-pms/)[Menstrual cycle and mood](https://niyora.com/research/topics/condition-cycle-mood/) 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 Cohort study, 2026 What genetic factors are linked to premenstrual symptoms? Randomised trial, 2026 Does aerobic or resistance exercise reduce anxiety in women with PMS? Study, 2026 How do women with PMDD process emotions differently in their brains? Systematic review, 2026 Why do some women experience mood changes linked to their menstrual cycle? Case-control study, 2026 Do women with PMS handle emotions differently at different times of the cycle? Survey study, 2025 Does PMDD or PMS affect quality of life? Ask AI about this page Copy prompt ChatGPT ↗ Claude ↗ Perplexity ↗ Google AI Mode ↗ Grok ↗