Irregular periods are common in perimenopause, but not every change should be ignored
Perimenopause is the transition leading up to menopause, and changes to your periods are often one of the first things you notice. They may come more or less often, become heavier or lighter, or occasionally disappear for a while and then return.
Tracking those changes can help you see your own pattern and explain symptoms clearly to a healthcare professional. It cannot tell you by itself that perimenopause is definitely the cause.
What is perimenopause?
Perimenopause usually happens before menopause and often begins in the 40s, although timing varies and it can happen earlier. Hormone levels fluctuate rather than simply declining in a straight line, which helps explain why symptoms and bleeding patterns can feel unpredictable.
Menopause is reached when you have not had a period for 12 months. Hormonal contraception can make this harder to judge because some methods change or stop bleeding.
For a broader overview, read our guide to what every woman should know about perimenopause.
How periods can change
Timing
Periods may come closer together, farther apart or become less predictable from one month to the next.
Flow
Bleeding can become heavier or lighter. Heavy bleeding can contribute to iron deficiency and deserves assessment if it is affecting your life.
Duration
Some periods become shorter; others last longer than you are used to.
Skipped periods
You may miss one or more periods during perimenopause. Pregnancy is still possible until menopause, so a missed period may still need a pregnancy test depending on your circumstances.
A note about bleeding between periods or after sex
Although cycle irregularity is common in perimenopause, bleeding between periods or after sex should not simply be written off as “normal menopause changes”. NHS guidance says unusual bleeding should be checked by a GP or sexual health clinic.
Likewise, any vaginal bleeding after you have gone 12 months without a period needs medical assessment, even if it happens only once.
How cycle tracking can help
- Identify your pattern: note when periods arrive, how long they last and whether flow is changing.
- Track symptoms: hot flushes, night sweats, mood changes, sleep problems, headaches and vaginal symptoms can all be useful context.
- Prepare for appointments: a simple record can make conversations with a GP or menopause clinician more specific.
- Remember contraception: perimenopause is not the same as infertility. Pregnancy remains possible.
Tracking is about documentation, not diagnosis.
What should you record?
- the first day of each period
- cycle length
- how heavy or light the bleeding is
- pain and other symptoms
- any bleeding between periods or after sex
- medicines, HRT or contraception that might affect bleeding
What about Tempdrop?
Tempdrop can collect overnight temperature data and may help you see cycle patterns without a fixed morning BBT routine.
During perimenopause, though, temperature patterns can become less predictable. Tempdrop cannot diagnose perimenopause, tell you whether unusual bleeding is safe to ignore, or replace medical advice.
The bottom line
Irregular periods can be part of perimenopause, but “irregular” should not become a blanket explanation for every kind of bleeding.
Track what is happening, seek advice if changes are worrying or disruptive, and get bleeding between periods, after sex or after menopause checked.
Sources
NHS: menopause and perimenopause symptoms
NHS: bleeding between periods or after sex
