
Am I in perimenopause? Signs, symptoms & the science
Brain fog, anxiety, poor sleep - yet your periods are still regular? Here’s why many women start asking “am I in perimenopause” years earlier than expected.
What’s changing and why it feels so personal?
Menopause is often described as a reproductive transition. But many of the symptoms women notice first happen in the brain: memory lapses, emotional intensity, disrupted sleep, anxiety, brain fog, and changes in motivation.
This section explores what the science actually says about the biological changes happening beneath those experiences.

These pillars explain what the menopause transition is, why it affects the brain, and how to make sense of the changes you’re experiencing.
Perimenopause can begin years before periods stop, and it rarely announces itself clearly. This is the pillar that walks you through the signs that point to the transition, and the ones that point somewhere else and deserve a doctor.
Once you know you are in it, the next question is why it feels the way it does. The menopause science pillar explains what estrogen actually does in the brain, and how researchers study this. It is the foundation the rest of the site rests on.