Irregular Cycles and What They Mean
Changing periods are often the first visible sign of perimenopause. Learn what counts as a normal shift, what is worth investigating, and how to track it.
A menstrual cycle is considered regular if it falls roughly between 21 and 35 days, with some variation month to month. During perimenopause, that predictability fades. Cycles may shorten, lengthen, skip, or change in flow — and these shifts are a normal part of the transition.
Why cycles change
As ovarian function declines, ovulation becomes less consistent. Without reliable ovulation, progesterone is not produced in the same amounts, and the timing and character of your period shift. Shorter cycles early in perimenopause often give way to longer, more spaced-out cycles later.
Tracking helps
Keeping a simple record of cycle start dates, flow, and any symptoms gives you and your clinician real information to work from. A notes app, a calendar, or a period tracker all work. Bring several months of records to your visit — patterns matter more than any single month.
Patterns that warrant evaluation
Some changes are not typical perimenopause and should be checked:
- Periods that become much heavier or last longer than usual
- Bleeding between periods or after intercourse
- Cycles shorter than 21 days on a recurring basis
- Any bleeding after twelve months without a period
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These articles are educational and general in nature. They are not medical advice, diagnosis, or treatment, and do not replace a conversation with a qualified clinician. Your care plan is created one-on-one during a visit, based on your history, exam findings, and labs.