--- title: Does chronic stress make progesterone withdrawal anxiety worse in a rat model of PMDD? description: In stress-prone rats, yes. Chronic stress made anxiety from progesterone withdrawal more severe and changed how the brain's stress system responded. However, url: https://niyora.com/research/papers/effect-of-chronic-unpredictable-stress-in-female-wistar-kyoto-rats-subjected-to-2023/ --- - [Niyora](https://niyora.com/) - [Research](https://niyora.com/research/) - [Library](https://niyora.com/research/library/) - Does chronic stress make progesterone withdrawal anxiety worse in a rat model of PMDD? Randomised trial, 2023 # Does chronic stress make progesterone withdrawal anxiety worse in a rat model of PMDD? In stress-prone rats, yes. Chronic stress made anxiety from progesterone withdrawal more severe and changed how the brain's stress system responded. However, this is an animal study, so we cannot be certain the same happens in humans. Early or limited evidence Female Wistar-Kyoto rats (a strain prone to anxiety) ## What they did Animal study using female rats prone to anxiety. Rats were exposed to chronic unpredictable stress for 30 days or kept in normal conditions. All rats then received progesterone for 5 days, stopped it, and were tested for anxiety behavior. Researchers then examined brain tissue and stress hormones in blood. ## What they found Progesterone withdrawal caused greater anxiety-like behavior in rats exposed to chronic stress. Chronic stress altered the brain's stress response genes and blunted the normal rise in stress hormones when multiple stressors occurred together. ## What it means for you In this rat model, chronic life stress may make PMDD symptoms worse by changing how the brain's stress system works. This could help explain why women reporting higher daily stress sometimes report worse PMDD. The major limitation is that this is a rat study, not humans, so we need human research to know if this applies. 30 days Duration of chronic stress 2 mg/kg Progesterone dose 5 days Days of progesterone treatment ## About the study Original title Effect of chronic unpredictable stress in female Wistar-Kyoto rats subjected to progesterone withdrawal: Relevance for Premenstrual Dysphoric Disorder neurobiology Authors Islas-Preciado D, López-Rubalcava C, Estrada-Camarena E et al. Journal Psychoneuroendocrinology Year 2023 Study design Randomised trial What was tested Chronic unpredictable stress for 30 days, followed by progesterone withdrawal Open access Yes Read the paper [doi.org/10.1016/j.psyneuen.2023.106331](https://doi.org/10.1016/j.psyneuen.2023.106331) ## Topics [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/)[Stress](https://niyora.com/research/topics/symptom-stress/)[Economic burden](https://niyora.com/research/topics/life-area-economic-burden/) 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? Survey study, 2026 What lifestyle and work factors are linked to PMDD symptoms in Chinese nurses? Survey study, 2025 Is the PSST a good screening tool for PMS in Bangladesh? Case-control study, 2024 Do women with PMDD have a weaker stress response? Randomised trial, 2024 Does emotion-focused therapy help PMDD symptoms? Survey study, 2022 How common are PMS and PMDD? Are stress, anxiety, depression, and sleep problems related to them? Ask AI about this page Copy prompt ChatGPT ↗ Claude ↗ Perplexity ↗ Google AI Mode ↗ Grok ↗