You might not recognize yourself lately. Small things feel bigger, your patience is thinner, and anxiety seems to appear out of nowhere. Many women describe this midlife mood shift as “feeling on edge” or “not like myself.”
These emotional changes are some of the most common — and least talked about — symptoms of perimenopause and menopause. They’re not a personal weakness. They’re physiological.
How Hormones Influence Mood
Estrogen and progesterone don’t just affect your cycle — they profoundly shape how your brain feels, responds, and regulates emotion.
Here’s how:
- Estrogen and Serotonin
Estrogen increases serotonin production and helps brain cells use it efficiently. When estrogen fluctuates, serotonin levels drop — which can feel like anxiety, sadness, or irritability. - Progesterone and GABA
Progesterone acts on GABA receptors — the same calming pathways targeted by anti-anxiety medications. When progesterone declines in your 40s, this calming influence weakens, leaving the nervous system more reactive. - Cortisol and Stress Sensitivity
The brain and adrenal glands communicate through the HPA axis. During perimenopause, this system becomes more sensitive. Even moderate stress can trigger a stronger cortisol response, intensifying mood swings or restlessness.
Together, these changes alter how your brain processes stress — so emotions that once felt manageable now feel overwhelming.
Why You Might Feel “Not Like Yourself”
In practice, I often hear women say:
“I’ve always handled stress well, but now I feel like I’m constantly on edge.”
“I cry at things that never used to bother me.”
This isn’t in your head. It’s the brain adapting to a new hormonal rhythm. Estrogen supports dopamine and serotonin — the “motivation and mood” messengers — while progesterone stabilizes the nervous system. When they fluctuate, emotional regulation takes a temporary hit.
Add in poor sleep, blood sugar instability, and the invisible load of daily life — and the emotional strain multiplies.
Clinical Insight
When assessing mood changes during perimenopause or menopause, I look beyond basic hormone levels. Key insights often come from:
- Mapping symptoms across the menstrual cycle (or time since last period)
- Testing estrogen, progesterone, cortisol, and thyroid levels
- Assessing key nutrient level status for brain health
- Evaluating sleep and blood sugar regulation patterns
From there, care becomes deeply individualized — sometimes including:
- Nervous system retraining and stress resilience tools
- Nutrition and targeted supplementation that support serotonin and GABA pathways
- Bioidentical hormone therapy when appropriate
- Addressing sleep, digestion, and inflammation that amplify mood changes
These shifts are often missed in standard labs — which is why personalized testing and support can make such a difference.
About Dr. Marlee, ND
Dr. Marlee, ND is a licensed Naturopathic Doctor based in Toronto with a clinical focus on hormonal imbalances, skin health, digestive concerns, adrenal dysfunction, and healthy aging. Known for her patient-centered and results-driven care, she helps individuals understand the root causes of their symptoms through comprehensive assessments and personalized treatment plans. Dr. Marlee, ND empowers her patients to take an active role in their health, blending education with evidence-based naturopathic medicine to support lasting change. She is a trusted voice in women’s health, with appearances on Rogers Media, Today’s Shopping Choice, and features in Chatelaine Magazine.
Dr. Marlee, ND offers virtual naturopathic medical care to patients across Ontario.
