Women’s hormones don’t just affect mood — they shape brain function, memory, and resilience. And the brain feels hormonal shifts long before the body does. Estrogen supports blood flow, protects neurons, boosts serotonin, and stabilizes cognition. So when hormones fluctuate — postpartum, around periods, during perimenopause — the brain often speaks first. Common early signals I see: ✅ new or worsening headaches ✅ brain fog or forgetfulness ✅ mood sensitivity or irritability ✅ sleep changes ✅ fee