Most period trackers assume a cycle that repeats. Perimenopause is the years when it stops repeating, and the app that predicted your period to the day at 32 starts guessing at 46. The dates are still worth keeping. They’re the one record a clinician can use to stage the transition.
What happens to periods in perimenopause?
The NHS page on symptoms of menopause and perimenopause says a change to your periods is usually one of the first signs. They may come more often or less often, the bleeding may get heavier or lighter, and eventually they stop.
The American College of Obstetricians and Gynecologists says the same in its FAQ on the menopause years. The ovaries start making estrogen unevenly from your 30s and 40s. Cycles get longer or shorter than usual for you, you may skip periods, and flow may get lighter or heavier. ACOG puts the usual start in the mid-40s and the average age of the last period in the United States at 51. The NHS gives 45 to 55 as the usual range and says it can happen earlier.
Shorter cycles often come first, so a 24-day cycle after years of 30 is an early sign people miss because it looks like nothing is wrong. Then the gaps stretch. One period arrives after seven weeks, and the next comes three weeks later.
How irregular are periods during perimenopause?
Irregular enough that researchers wrote a definition. The STRAW+10 staging system, published in the journal Menopause in 2012 and still the reference clinicians use, splits the transition into two stages using nothing but your period dates.
- Early transition. Consecutive cycles differ in length by 7 days or more, and the difference is persistent. Persistent means it happens again within 10 cycles of the first odd one. A 30-day cycle followed by a 38-day cycle, followed a few months later by a 26-day one, meets the definition.
- Late transition. You go 60 days or more without a period. STRAW+10 estimates this stage lasts one to three years on average.
Menopause itself is a date you can only name in hindsight. The NHS and ACOG both define it as 12 months with no period, so the last period becomes “the last period” a year after it happened. The NHS says symptoms usually last 7 to 9 years, sometimes longer, and they change over that time.
So the dates matter more than anything else you could log. “Are my cycles more than a week apart in length” and “how long was the longest gap” are the two questions a doctor asks, and you can’t answer either from memory.
Why period tracker apps struggle in perimenopause
Most apps take your recent cycle lengths, average them, and add that to your last day 1. That works while the lengths cluster, and it fails in three ways once they stop.
A single 60-day gap drags a plain average up for months, so the app predicts late for cycles that arrive on time. A run of short cycles does the opposite. And most apps don’t know how to record a skipped period, so the forecast keeps sliding forward one day at a time. The app sends “your period is late” for weeks, until the next bleed resets it.
Logging more carefully won’t fix any of that. Look at how far apart your last six cycles were instead of when the next one is due.
What to track in perimenopause
You need to track less than you’d think, and the same few things every time. A long series of dates helps a clinician more than one detailed month.
Every period, including the ones that arrive after a long gap
Log the first and last day of bleeding every time. Mark spotting as spotting so it doesn’t move your day 1. The gap between one day 1 and the next is your cycle length, and you can answer the STRAW+10 questions entirely from those gaps. Our period calculator for irregular periods does that arithmetic on dates you already have, including the seven-day comparison. A period that shows up after 70 days is the most useful entry in the whole diary, and the one people most often skip because the app has stopped asking.
Flow, in something you can count
Count how many period products you use each day. Perimenopause can make bleeding heavier, and heavier is also on the list of things to report, so a count you can compare across years is worth more than writing light or heavy. The NHS list for heavy periods includes changing a pad or tampon every 1 to 2 hours and passing clots larger than about 2.5cm.
Hot flushes, night sweats and sleep
The NHS describes a hot flush as your face, neck and chest suddenly feeling very hot or cold, lasting several minutes, sometimes with a racing heart. ACOG says they range from a few times a month to several times a day. Log them on the day they happen. The useful pattern is whether they cluster around your period, and you can’t see that without the dates next to them. Sleep broken by night sweats belongs in the same entry.
Mood, briefly
One word a day is enough. A clinician wants to know whether low mood follows your cycle or has stopped following it. For that, the date matters more than a long description.
When to see a doctor
Irregular periods are expected. Some kinds of bleeding aren’t, and ACOG’s page on perimenopausal bleeding is blunt about which. It isn’t normal to bleed or spot between periods, to bleed after sex, to bleed heavily during a period, to bleed heavier or for more days than is usual for you, or to bleed at all after menopause. ACOG adds that period changes in perimenopause are normal and you should still report them.
The NHS gives two reasons to see a GP. See one if you still have periods but the pattern has changed and you’re bleeding more than before. Also see one if you haven’t had a period for 12 months or more and then have any vaginal bleeding.
Don’t wait for any of that if symptoms are getting in the way of work, sleep or relationships. The NHS says early advice helps, and there’s no rule that says you have to wait for a stage.
What’s the best period tracker for perimenopause?
The best one does three things well. A perimenopause mode isn’t one of them.
- A prediction that admits uncertainty. Once your cycles vary, a single confident date is still a guess. A range, or a plain “still learning”, is the honest answer.
- Symptoms next to dates. You should be able to log hot flushes, sleep and mood on the calendar, so you can see whether they follow the cycle.
- Your cycle lengths, listed. You answer the 7-day and 60-day questions from that list. If the app only shows a countdown to the next period, you’ll be counting on your fingers at the appointment.
If you want a longer comparison, our roundup of period tracker apps names Clue as the pick for irregular cycles and clinical detail. Clue also has a dedicated perimenopause mode. Our privacy checklist matters here too, because a record of hot flushes and skipped periods is a record of your age and your health.
How Plum handles perimenopause
We build Plum, a period tracker for iPhone, so this is what it does and doesn’t do. It has no perimenopause mode, and it won’t tell you which stage you’re in.
Plum predicts from a rolling median of your recent cycles rather than a plain average, so one 60-day gap doesn’t drag every forecast after it. When your cycles vary by more than about five days, it predicts from your last three cycles, so the date follows where your cycle is now. The calendar still shows one predicted day. The insights screen lists your cycle lengths and how much they move, which are the numbers that answer the STRAW+10 questions.
Hot flushes (Plum calls them hot flashes), sleep, mood, energy, pain and medication are logging categories you can switch on, and they sit on the same day as the period entry. Marking a period day takes a tap, and spotting stays separate from period days so it never moves your day 1.
Plum shows no ads and never sells personal data. It does require an account and syncs your data to our servers, encrypted in transit and at rest, so we won’t tell you it stays on your phone. You can delete your account and everything in it from inside the app. If you’re in a group, the group sees your period dates and nothing you logged about how you felt.
