Life stages · 6 minute read
Cycle changes during perimenopause
Why timing and flow can change in the menopause transition and why new bleeding patterns still deserve assessment.
Evidence-informed · Editorial review August 2026 · Links to trusted sources are available in the interactive app
Ovulation becomes less predictable
During perimenopause, ovarian hormone patterns change and ovulation may not occur every month. Cycles can become shorter, longer, skipped, lighter, or heavier.
Track the whole picture
Along with cycle dates and flow, record hot flashes, night sweats, sleep, mood, vaginal or urinary symptoms, and medicines. A timeline can help distinguish a repeating pattern from a new isolated symptom.
Do not assume every change is menopause
Pregnancy remains possible until menopause is established, and other conditions can cause abnormal bleeding. Bleeding after menopause—12 months without a period—should be evaluated by a clinician.