Periods and cycles

Periods usually change first in perimenopause, often before any hot flash. Cycles tend to get a little shorter, then vary by a week or more, then skip for 60 days or longer; flow can become heavier, lighter or longer. Irregular timing alone is normal at this stage, but bleeding between periods, after sex, much heavier than usual or after menopause is not, and should be checked.

Where to start

For the typical sequence and the hormonal reasons behind it, start with how periods change in perimenopause. If your periods have become heavy, long or full of clots, read heavy periods and clots in perimenopause, which explains what counts as heavy, how it is evaluated and which treatments work. Because pregnancy is still possible, birth control in perimenopause covers which methods US guidance favors after 40 and when it is safe to stop.

Cycle changes at a glance

Change	What it looks like	What it usually means	Read the guide
Shorter cycles	Periods arriving a few days early	Often the first sign of the transition	How periods change
Irregular cycles	Cycle length varying by 7 or more days	The definition of early perimenopause	How periods change
Skipped periods	Gaps of 60 days or more, then a period returns	The late transition; pregnancy is still possible	Birth control in perimenopause
Long or heavy periods	Bleeding 10 or more days, soaking a pad hourly, clots the size of a quarter	Common, but worth evaluating for fibroids, a thickened lining and low iron	Heavy periods and clots
Bleeding outside your pattern	Spotting between periods or after sex, any bleeding after menopause	Not a normal perimenopausal change; needs evaluation	Heavy periods and clots

What helps

Irregular timing on its own, without heavy flow or red-flag bleeding, usually needs no treatment; irregular periods explains what is expected. Keeping a record of every bleeding day is still worth it: it shows your clinician the pattern, and it is the only way to date your final period, since menopause is confirmed after 12 months with no bleeding or spotting.

When periods are heavy or disruptive, treatment depends on the cause, which is why evaluation comes first. Options include the hormonal IUD, combined pills, patch or ring, progestin-only methods, tranexamic acid during the period and NSAIDs. The hormonal IUD and combined methods double as contraception, and combined methods can also control hot flashes. Heavy bleeding can drain iron and is linked to tiredness, so see fatigue in perimenopause if exhaustion is part of the picture. Hormone blood tests rarely settle anything here; why hormone tests are often normal explains why.

When to see a clinician

Report bleeding between periods, after sex, heavier or longer than usual for you, or any bleeding after menopause. Seek emergency care if you are soaking through a pad or tampon every hour for more than 2 hours with dizziness, chest pain or shortness of breath. See someone too if your periods became irregular before 40, or if heavy periods come with fatigue or breathlessness on exertion.

The symptom check helps you summarize cycle and symptom changes before a visit, and you can find an ob-gyn near you or browse the full directory.