Cycles and Hormones
How the menstrual cycle works as a system, and what each phase does to sleep, mood, temperature and pain. Covers luteal phase problems, cycle length changes, spotting, and the honest limits of what a hormone blood test can tell you on any given day.
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Why your cycle gets shorter in your 30s and 40s
A cycle that shortens from 29 days toward 25 is usually the follicular phase contracting, not the luteal phase. As antral follicle counts fall, early-follicular FSH rises sooner,…
September 8, 2026 · 6 min read