Irregular periods in perimenopause
Early, late, heavy, light or skipped: changing periods are usually the first sign of perimenopause. Here's what's normal, what needs checking, and what helps.
The short answer: irregular periods are normal in perimenopause. Cycles that vary by a week or more, heavier or lighter bleeding and skipped months are all common. Very heavy bleeding, periods more often than every 21 days, bleeding between periods or after sex, and any bleeding after a year without a period should be checked.
For most of your adult life, your cycle depended on regular ovulation. In perimenopause, ovulation becomes unpredictable. Some months you ovulate early, some late, and some not at all. Your period follows whatever your hormones did that month, which is why it can feel random.
Usually normal
- Cycles that change length by seven days or more
- Periods coming every three weeks for a while, then every six
- Some heavier periods, some lighter ones
- Skipping a month or two, then periods returning
- Worse PMS, breast tenderness or cramps in some cycles
- Gaps of 60 days or more as you get closer to your final period
Worth checking
- Soaking a pad or tampon every hour for several hours
- Passing large clots or bleeding longer than seven days
- Periods more often than every 21 days
- Bleeding between periods or after sex
- Feeling tired, short of breath or dizzy, which can mean low iron
- Any bleeding after 12 months with no period. Bleeding after menopause
Why periods get heavier
When you ovulate, your body makes progesterone, which keeps the uterine lining in check. In cycles where you don't ovulate, estrogen can keep building the lining without that balance. When it finally sheds, the period can be heavy and long.
Fibroids and polyps are also common in your 40s and can cause heavy or irregular bleeding. Thyroid problems and some medicines, including blood thinners, can play a part too. That's why a new pattern of heavy bleeding deserves an evaluation rather than a shrug.
Heavy periods aren't something to just live with.
Most new patients are seen within a week, in person in Bridgewater or Nutley, or by video anywhere in New Jersey.
How we evaluate irregular bleeding
We start with your history: how your cycles have changed, how heavy they are, and what else you're noticing. Depending on the picture, we may check:
- A pregnancy test, because pregnancy is still possible
- A blood count and iron levels, to look for anemia from heavy bleeding
- Thyroid function, which can disrupt cycles on its own. Thyroid care
- A pelvic ultrasound, to look for fibroids or polyps
- A sample of the uterine lining, often recommended for women over 45 with abnormal bleeding, to rule out precancerous changes
Treatments that steady cycles
Hormonal IUD
Lightens or stops bleeding for most women, prevents pregnancy, and can later be the progestin part of hormone therapy.
Low-dose birth control pill
Regulates cycles and eases hot flashes for healthy non-smokers, while preventing pregnancy.
Progestin therapy
Taken for part of each month or continuously to control the lining and reduce bleeding.
Tranexamic acid
A non-hormonal tablet taken only on heavy days that can reduce bleeding substantially.
Anti-inflammatory medicine
Ibuprofen or naproxen during your period can reduce both cramps and blood loss.
Iron
If heavy periods have drained your iron, replacing it often helps fatigue more than anything else. Perimenopause fatigue
Keep reading
Irregular period questions
Is it normal to have irregular periods in perimenopause?
Yes. Changing cycles are usually the first sign of perimenopause. Periods may come closer together or further apart, get heavier or lighter, or skip a month. What isn't normal is very heavy bleeding, bleeding between periods or after sex, or any bleeding after you've gone a year without a period.
Why are my periods heavier in perimenopause?
In perimenopause you don't ovulate every month. In cycles without ovulation, estrogen can build up the uterine lining without enough progesterone to balance it, so the period that follows can be heavier and longer. Fibroids and polyps, which are common at this age, can also cause heavy bleeding.
Can I still get pregnant if my periods are irregular?
Yes. Irregular periods mean you ovulate less predictably, not that you've stopped. Keep using contraception until you've gone 12 months without a period if you're over 50, or 24 months if you're under 50.
When should I see someone about irregular bleeding?
Call if bleeding soaks a pad or tampon every hour, lasts more than seven days, comes more often than every 21 days, happens between periods or after sex, or returns after 12 months without a period. Women over 45 with abnormal bleeding often need a closer look at the uterine lining.
What helps heavy periods in perimenopause?
A hormonal IUD is one of the most effective options and also provides contraception. Others include a low-dose birth control pill, progestin therapy, tranexamic acid on heavy days, and anti-inflammatory medicines such as ibuprofen. If heavy bleeding has lowered your iron, we treat that too.
How long do irregular periods last before menopause?
Irregular cycles often last a few years. Once you're having gaps of 60 days or more between periods, your final period is usually within a year or two.
- Harlow SD, et al. Executive summary of the Stages of Reproductive Aging Workshop +10 (STRAW+10). Menopause 2012;19(4):387–395.
- American College of Obstetricians and Gynecologists. Diagnosis of Abnormal Uterine Bleeding in Reproductive-Aged Women. Practice Bulletin No. 128.
- The 2022 Hormone Therapy Position Statement of The North American Menopause Society. Menopause 2022;29(7):767–794.
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