Periods in Perimenopause: Heavier, Irregular, or Gone?
In perimenopause your periods can get heavier, lighter, closer together or disappear for months. Here is what is a normal part of the change, what is not, and why you still need contraception.
TL;DR: In perimenopause, periods often come more or less often and get heavier or lighter. Skipping periods is common. Bleeding that soaks a pad every hour or two, lasts more than seven days, comes less than 21 days apart, happens between periods or after sex, or appears after 12 months without a period should be checked by a doctor. You can still get pregnant until menopause is confirmed, so keep using contraception.
For years your period arrived like clockwork. Then, somewhere in your forties, it started doing its own thing. One month it comes after three weeks, heavy enough that you plan your commute around the nearest toilet. The next, it does not come at all and you find yourself doing a pregnancy test at 46. Your friends in the group chat swap stories, your mother says "it is just the change," and you are left wondering what is normal and what is worth a doctor's visit. Here is a clear guide to what happens to periods in perimenopause, and the signs you should never ignore.
What happens to periods in perimenopause?
They usually become less predictable: they may come more often or less often, and bleeding may get heavier or lighter. The NHS notes that a change to your periods is usually one of the first signs of perimenopause. The World Health Organization describes the transition as a time of changes in the regularity and flow of the menstrual cycle, ending in periods stopping altogether. Most women reach menopause between 45 and 55, and menopause is confirmed once you have gone 12 months in a row without a period.
If you want the bigger picture beyond bleeding, including hot flushes, sleep and mood, read our guide to perimenopause symptoms and our piece on hot flushes and night sweats.
Why cycles change
Your ovaries do not wind down in a smooth, gradual line. Hormone levels rise and fall unpredictably, and in some cycles you do not release an egg at all. The American College of Obstetricians and Gynecologists (ACOG) explains that when you do not ovulate for several cycles, the lining of the womb can become too thick, which can lead to irregular and sometimes heavy bleeding. This may be why a period after a long gap can arrive as a flood. Research following women through the transition found that short cycles are common early on, with longer gaps between periods becoming more frequent closer to the final period.
Heavier periods and flooding
Many women are caught off guard by how heavy perimenopausal periods can get. Flooding, where blood comes suddenly and soaks through your clothes or bedding, can be frightening, especially at work or in church. The NHS describes your periods as heavy if you:
- need to change your pad or tampon every 1 to 2 hours
- pass clots larger than about 2.5cm
- bleed through to your clothes or bedding
- need to use two types of period product together, such as a pad and a tampon
- have periods lasting more than 7 days
Heavy bleeding is not something you just have to endure. Fibroids can make bleeding heavier at this age too (see our fibroids guide). Months of heavy loss can also drain your iron and leave you exhausted. Our guides to heavy periods and iron-rich foods for heavy periods go deeper. ACOG notes that hormonal treatments, including hormone therapy and hormonal contraception, can help with heavy bleeding in perimenopause. We weigh up the options in HRT benefits and risks.
Skipped periods
ACOG says that during perimenopause it is common to skip periods or for bleeding to get lighter or heavier. You might go two or three months without a period and then have one as if nothing happened. That is why one long gap does not mean you have reached menopause. The 12-month count starts again every time you bleed.
If you are not sure whether your irregular cycles are perimenopause or something else, such as thyroid problems or PCOS, our articles on irregular periods and when irregular periods need a doctor can help you sort through it.
When is bleeding in perimenopause not normal?
Bleeding that is much heavier or more frequent than before, lasts longer than seven days, happens between periods or after sex, or comes back after a year without periods is not something to put down to "the change." ACOG lists these as signs of abnormal uterine bleeding:
- bleeding or spotting between periods
- bleeding or spotting after sex
- bleeding that lasts more than 7 days
- cycles longer than 35 days or shorter than 21 days
The NHS also advises seeing a GP if your bleeding pattern has changed and you are bleeding more, not less, than before.
Often the cause is something treatable such as hormonal shifts, fibroids or polyps. But these symptoms need checking because they can also be a sign of a thickened womb lining or, less commonly, cancer.
Is bleeding after menopause ever normal?
No. Any bleeding from the vagina once you have gone 12 months without a period should be checked by a doctor, however light and even if it happens only once. The NHS is clear that you should see a GP if you have any bleeding after menopause. It is usually caused by something minor, such as thinning of the vaginal or womb lining or polyps, but it can be a sign of womb cancer, so it always needs to be looked at. Do not wait for it to happen again, and do not let anyone tell you it is just old blood clearing out.
Do you still need contraception in perimenopause?
Yes. Irregular periods do not mean you cannot get pregnant, and periods can return after several months away. UK guidance from Women's Health Concern advises that you keep using contraception for two years after your last period if it was before age 50, and for one year if it was after 50. Contraception can usually be stopped at 55, even if you still have the occasional period. HRT is not a contraceptive, so if you start it, you may still need a separate method. Some hormonal methods can also make heavy bleeding lighter, which is a helpful bonus. Our guide to contraception methods compared walks through the options.
Tracking your pattern
When your cycle is all over the place, memory is unreliable. Was the last one five weeks ago or seven? Did that heavy month last six days or nine? Writing it down makes a difference, both for your own peace of mind and for the doctor, who will want to know dates, how heavy the flow was, and whether there was bleeding between periods or after sex. Note:
- the first and last day of each bleed
- how often you changed pads or tampons on the heaviest day
- any clots, flooding or spotting between periods
- other symptoms such as hot flushes, poor sleep or mood changes
Our guide on how to track your period covers simple methods. In Asele, you can log your cycle and symptoms as they change, ask Amara questions in Yoruba, Hausa, Igbo, Swahili, French or English, and take a Health Brief to your appointment so your doctor sees the pattern at a glance.
This post is education, not medical advice. Perimenopause is a natural stage of life, but it is not a reason to ignore bleeding that worries you. If something feels different, get it checked.
References
- NHS. Menopause and perimenopause symptoms. nhs.uk
- NHS. Heavy periods. nhs.uk
- NHS. Postmenopausal bleeding. nhs.uk
- World Health Organization. Menopause fact sheet. who.int
- American College of Obstetricians and Gynecologists. Abnormal Uterine Bleeding. acog.org
- Women's Health Concern. Contraception for women over the age of 40 (fact sheet). womens-health-concern.org
- Harlow SD, Paramsothy P. Menstruation and the menopause transition. Obstet Gynecol Clin North Am, 2011. ncbi.nlm.nih.gov
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