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How Long Does Menopause Last? The confusing part is that 'menopause' means three different things depending on who's using it.
How Perimenopause and Menopause Are Diagnosed There's no single test. Here's what a diagnosis is actually based on.
What Age Does Perimenopause and Menopause Start? Typical ages, early menopause cutoffs, and when to ask a doctor.

All biology articles

Cortisol and the Perimenopausal Brain Why the same stressors hit harder now, and what that means for your brain long-term.
Estrogen's Reach Beyond Reproduction Estrogen receptors sit in almost every organ, which is why losing estrogen has such wide effects.
FSH and LH Blood Tests Explained Why FSH bounces around, and why one blood test is unreliable in perimenopause.
How Hot Flashes Work Why the hypothalamus misfires, and what every treatment targets.
HRV in Perimenopause Why estrogen loss pulls your HRV down, and what the trend actually tells you.
Insulin Resistance in Perimenopause Estrogen decline sets off a metabolic shift that diet and exercise alone cannot fully reverse.
Perimenopause Stages Explained Hormone changes start years before your cycle shifts. Here is the map.
Progesterone Decline in Perimenopause Progesterone falls before estrogen, and its brain effects explain the earliest symptoms.
Testosterone Decline in Perimenopause What testosterone does, why it falls, and how it shapes energy, libido, and drive.
Thyroid Disease in Perimenopause Nearly identical symptoms; one blood test separates them.