Perimenopause & Your Period: Heavier, Irregular Bleeding
In perimenopause, the menstrual phase becomes unpredictable: fluctuating estrogen and progesterone can make periods heavier, lighter, longer, shorter, or skipped. Some change is expected, but very heavy bleeding, periods closer than 21 days apart, or bleeding between periods should be checked by a doctor.
The hormones behind your menstrual phase
The menstrual phase begins on the first day of your period, when both estrogen and progesterone bottom out. Without progesterone to hold it in place, the uterine lining sheds. Those rock-bottom hormone levels are why energy, mood, and body temperature dip, and why prostaglandins (the compounds that make the uterus contract) can drive cramps, fatigue, and looser digestion.
- Estrogen and progesterone are at their cycle lows, so energy and mood run quieter.
- Prostaglandins trigger uterine contractions, which can cause cramps and lower-back ache.
- Iron drops with blood loss, adding to fatigue and brain fog.
- Pain sensitivity is higher, so rest and gentle movement beat pushing hard.
What's normal for your period now
Irregularity is the hallmark of the perimenopausal menstrual phase.
- Cycles that shorten, lengthen, or vary month to month.
- Heavier flow, sometimes with clots, as hormones swing.
- Skipped periods that then return.
Track how you feel and spot the pattern
PhaseBloom logs your symptoms and mood against your cycle in seconds a day, so you can see which days hit hardest and prepare before they arrive.
When to see a doctor
Some bleeding changes still warrant attention.
- Soaking through protection hourly or passing large clots.
- Periods closer than 21 days apart or lasting over seven days.
- Bleeding between periods, after sex, or after 12 period-free months.
This is education, not medical advice
This guide explains how Perimenopause and this phase of your cycle tend to interact, so you can understand your body and plan ahead. It is general education, not medical advice, diagnosis, or treatment. Perimenopause deserves proper medical care, so use this alongside your doctor rather than instead of them, and reach out for severe, new, or worsening symptoms.
Track how you feel and spot the pattern
PhaseBloom logs your symptoms and mood against your cycle in seconds a day, so you can see which days hit hardest and prepare before they arrive.
Frequently asked questions
Are heavy periods normal in perimenopause?
Heavier periods are common due to hormone fluctuations, but very heavy bleeding, large clots, or prolonged periods should be evaluated to rule out fibroids, polyps, or other causes.
Is it normal to skip periods in perimenopause?
Yes. Skipped and irregular periods are one of the most common signs of perimenopause as ovulation becomes erratic. Once you go 12 months with no period, you have reached menopause.