Many women expect menopause to arrive as a single, clearly marked event. In reality, the shift usually begins quietly, years earlier, in a stage called perimenopause. As Dr. Allen describes it, this is "when the system begins to shift" — and it can start in your late 30s or 40s, while your periods are still coming.
Why You Feel Different Before Anything "Stops"
During perimenopause, hormones like estrogen and progesterone don't simply decline in a smooth line — they fluctuate, sometimes dramatically, from month to month. Those swings are what drive so many of the symptoms women are told to expect only later: disrupted sleep, mood changes, anxiety that feels out of character, brain fog, new difficulty with weight, and cycles that become unpredictable.
Because standard labs during this stage can still read as "normal" on any given day, many women are reassured that nothing is wrong — even as they feel increasingly unlike themselves. It is one of the clearest examples of the Gray Zone in action.
Symptoms That Deserve Attention
- Sleep that fracturesWaking at 3 a.m., or sleeping through the night but never feeling rested.
- Mood and anxiety shiftsIrritability, tearfulness, or a low hum of anxiety that wasn't there before.
- Cognitive fogLosing words, losing focus, feeling a step behind.
- Cycle changesHeavier, lighter, closer together, or farther apart than your normal.
What Thoughtful Care Looks Like
Perimenopause is not something to simply endure until it passes. A careful evaluation can clarify what is shifting and when support may help. For many women, that includes options such as bioidentical hormone therapy tailored to their symptoms and stage — always after a proper workup and honest discussion of benefits and risks. You can learn more on our hormone therapy page.
Dr. Allen devotes real attention to this transition in Dr. Allen's book, Why Do I Feel Like This?, because so many women are left without language for what they are experiencing. If this resonates, take our 3-minute quiz or book a consultation.