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Understanding period changes
during perimenopause
Perimenopause often brings changes to the menstrual cycle. Periods may become irregular, heavier or lighter and the timing between cycles can vary.
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These changes are a normal part of hormonal shifts during perimenopause, but they can sometimes feel unpredictable.
Knowing why periods change can help you determine what is typical and when a perimenopause consultation can provide clarity on your symptoms.
Cycle changes explained. Clarity in what’s normal.
What this page covers
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how periods change during perimenopause
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why cycles can become irregular
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whether heavy periods are common
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when changes may need medical review
How periods change during perimenopause
During perimenopause, the menstrual cycle may become less predictable. Periods can come earlier or later than expected and the length of cycles may vary from month to month.
Some women notice skipped periods, while others experience more frequent cycles. These changes are linked to fluctuations in hormone levels, particularly oestrogen and progesterone.
Why periods become irregular in perimenopause
Hormone levels do not follow a consistent pattern during perimenopause. Ovulation may not occur regularly, which can affect the timing of periods.
This can lead to:
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shorter or longer cycles
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missed periods
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unpredictable timing
Irregular periods are often one of the earliest signs of perimenopause symptoms and hormone changes.
Heavy periods during perimenopause
Some women experience heavier periods during perimenopause, along with other physical symptoms and changes. This can happen when hormone changes affect how the lining of the uterus builds up and sheds.
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Heavy bleeding may include:
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needing to change sanitary products more often
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passing clots
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periods lasting longer than usual
While heavier periods can be part of perimenopause, it is important to explore your menopause treatment options if bleeding is excessive or significantly different from your usual pattern.
Pattern over time. Reassurance in understanding.
Common questions about period changes during perimenopause
Many women notice changes in their periods as perimenopause begins. These answers provide a clear starting point, with more detailed information available on each topic.
How do periods change during perimenopause?
Periods can become irregular in timing, flow and duration as hormone levels fluctuate.
Why do periods become irregular during perimenopause?
Irregular periods are caused by changes in ovulation and hormone patterns.
Can perimenopause cause heavy periods?
Hormonal changes can lead to heavier bleeding in some women.
How period changes fit into the menopause transition
Perimenopause is the first stage of the menopause transition, followed by the menopause milestone and then postmenopause. Changes in menstrual cycles are one of the key features of the perimenopause stage.
Understanding how periods change can help you recognise where you are in the menopause transition and what to expect over time.
Perimenopause → Menopause milestone → Postmenopause
Understanding your cycle changes
Changes to your menstrual cycle during perimenopause are common and often reflect normal hormonal shifts. While these changes can feel unpredictable, they usually follow patterns over time.
Being aware of what is typical can help you feel more confident about your body and recognise when it may be time to seek expert guidance regarding perimenopause symptoms and care.