Your Periods Are Changing. Here Is What That Means
For twenty-odd years your cycle did roughly what it always did. Now it has started doing something else. Closer together. Heavier. Skipping a month and then arriving twice. Lasting two days, or nine.
Cycle change is one of the earliest and most reliable signs of perimenopause, and it is often the one women notice long before anyone connects it to anything.
It is also the symptom where I most want you to know which changes are expected and which ones need a proper look, so that section comes first.
Get these checked rather than waiting
- Soaking through a pad or tampon every hour for several hours
- Passing clots larger than a quarter
- Bleeding between periods, or after sex
- Cycles consistently shorter than 21 days
- Periods lasting longer than seven days
- Any bleeding at all more than twelve months after your last period
Most of the time these turn out to be fibroids, polyps or hormonal, all of which are manageable. But they are not things to attribute to perimenopause without someone looking properly. Heavy bleeding is also the most common route into iron deficiency, which is worth catching early.
What is normal for this stage
In the earlier part of perimenopause, cycles often get shorter, not longer. Twenty-eight days becomes twenty-five, then twenty-four. That surprises people, who expect periods to space out from the start.
The reason is that ovulation starts happening earlier in the cycle, and the first half shortens.
Later, the opposite happens. You begin skipping ovulation in some cycles, so periods become unpredictable and start spacing out. Missing one, then having two close together, is very typical of this phase.
Flow commonly gets heavier before it gets lighter. When ovulation does not happen, progesterone is not produced in that cycle, and the lining builds up for longer under estrogen without it. The result is a heavier, sometimes longer bleed.
Still having periods means you can still get pregnant
Fertility declines in perimenopause but it does not stop until it stops. Irregular cycles make timing impossible to predict, which in practice means contraception still matters if pregnancy is not wanted.
The general guidance is to continue contraception for twelve months after your last period if you are over fifty, and two years if you are under fifty.
What tends to actually help
Track it, even roughly. Dates, flow, and how you felt. A few months of that tells you and any clinician far more than trying to describe it from memory, and it often reveals a pattern you could not see otherwise.
Check your iron if bleeding is heavy. Ferritin, not just hemoglobin. Iron can be meaningfully depleted long before standard anemia shows up, and low ferritin alone will produce fatigue, hair shedding and brain fog that are easy to blame on hormones.
Support progesterone where it is appropriate. Since much of the heavy, erratic bleeding comes from cycles without ovulation, this is often the most direct lever. There are several ways to approach it and the right one depends on your history.
Do not ignore the gut. Estrogen is metabolized in the liver and cleared through the gut. When that pathway is sluggish, estrogen recirculates. It is not the whole story and anyone claiming it is overselling it, but it is a genuine and frequently neglected part of the picture.
Rule out the structural causes. Fibroids and polyps are common and very treatable, and they are worth excluding before deciding this is hormonal.
When this ends
Menopause is diagnosed in hindsight, twelve consecutive months after your final period. There is no test that will tell you where you are in the process, and anyone selling you one is overstating what it can do.
Most women move through perimenopause somewhere between four and ten years. The cycle changes usually begin well before the other symptoms get anyone's attention.
Cycle changes rarely arrive alone. Read the full picture on perimenopause, or look at waking at 3am and rage and irritability.
