Irregular Periods in Perimenopause
Cycle irregularity is often the first sign of perimenopause. Cycles become shorter, then longer, then unpredictable — here's what's happening hormonally and how to track the transition.
Medical disclaimer
This content is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Dawn Phase is not a medical device. Always consult a qualified healthcare professional with questions about your health.
What causes it
As the ovarian reserve declines, follicle development becomes less reliable. Some cycles may not include ovulation, producing a shorter, lighter cycle (anovulatory cycle). Other cycles may have delayed or prolonged follicular phases, producing longer cycles. FSH rises as the pituitary gland tries harder to stimulate the ovaries. The result is cycles that vary unpredictably in length and flow.
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Dawn Phase logs Irregular Periods in Perimenopause patterns and shows you correlations — privately. No data selling.
Start free — no card neededHow to track it
Log period start dates, cycle lengths, and flow intensity for every cycle. Tracking over 6–12 months reveals the progression from regular cycles to shorter cycles (a common early sign), then to longer and more variable cycles. This record is valuable for distinguishing perimenopause from thyroid dysfunction, PCOS, or other causes of cycle irregularity.
When to see a doctor
See a doctor if bleeding is very heavy (soaking a pad or tampon per hour for more than a few hours), if periods become significantly more frequent than every 21 days, if you experience bleeding between periods or after sex, or if you have pelvic pain. Irregular bleeding in perimenopause should not be automatically attributed to hormones without ruling out fibroids, polyps, or endometrial pathology.
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Log symptoms daily and see how they connect to your cycle phases.
Start tracking free →This content is for informational purposes only and is not a substitute for professional medical advice.