Why Are My Periods Getting Closer Together in My 40s?
Written with Autumn — The Change’s on-device AI perimenopause coach.
The short answer
Periods can become closer together during perimenopause, because cycle timing often becomes less predictable. But a shorter cycle can have other explanations too, and a noticeable change in bleeding is worth discussing with a healthcare professional.
What a shorter cycle actually means
Your cycle is counted from the first day of one period to the first day of the next. A few early periods may be ordinary variation; a repeated change can be useful information, especially if the flow, pain or symptoms around it have changed too.
How perimenopause may fit
The NHS says periods may happen more often or less often during perimenopause, and bleeding may become heavier or lighter. The NHS describes irregular periods as one of the main signs of perimenopause.
What else belongs in the picture
- Could pregnancy be possible? You can still become pregnant during perimenopause.
- Are you using hormonal contraception, which can change bleeding patterns?
- Has the flow become much heavier, or are you bleeding between periods or after sex?
- Are pain, tiredness, dizziness or other symptoms arriving with the change?
What to notice
You do not need a perfect calendar to start a conversation. Notice the gap between periods, how long bleeding lasts, how heavy it feels, and what else travels with it. A short voice note to Autumn can be easier than building an elaborate spreadsheet.
When to ask for help
Talk with a clinician if the change keeps happening, is worrying you, affects daily life or comes with heavier bleeding, significant pain, bleeding between periods or after sex. Seek urgent care if bleeding is very heavy and you feel faint, weak or unwell.
Related reading
- Why Are My Periods Suddenly So Heavy in My 40s?
- Why Did My Period Suddenly Become Irregular?
- Why Am I Getting More Headaches in My 40s?
Trying to make sense of a changing cycle?
Autumn can help you describe the timing, flow and symptoms around your periods before you decide what questions to take to a healthcare professional. Autumn is the private, on-device AI coach inside The Change—not a clinician.
Sources & evidence
Sources checked: 18 September 2026.