Irregular periods in perimenopause are often the first sign of the change, the years before menopause when ovulation becomes less regular. It usually starts in the mid-40s, sometimes in the late 30s. Early on, cycles often get shorter, so periods can come every two to three weeks. Later, gaps of two months or more are common. Periods may also become heavier or lighter. Much of this is normal, but very heavy bleeding, bleeding between periods and periods closer than three weeks apart should be checked.
The two stages of change
- Early perimenopause: cycle length varies by a week or more from month to month. Periods often come sooner than before, and some are heavier.
- Late perimenopause: gaps of 60 days or more between periods, often with hot flashes, night sweats or poorer sleep.
Menopause is confirmed after 12 months in a row without a period. The average age is 51. If your periods have stopped for three months or more, see our guide to missed periods in your 40s.
Perimenopause and a period every two weeks
Shorter cycles are common early in perimenopause, because hormone swings can bring ovulation forward. But bleeding every two weeks isn’t something to simply accept. It can also come from polyps, fibroids or a thickened uterine lining, and frequent bleeding can lower your iron. If your periods come closer than three weeks apart, see a doctor. Our guide to periods that come early explains the other causes.
When to see a doctor
Book an appointment if you have:
- very heavy bleeding, such as soaking a pad or tampon every hour
- periods that last longer than seven days
- periods closer than three weeks apart
- bleeding between periods or after sex
- signs of low iron: tiredness, dizziness or shortness of breath
See a doctor promptly for any bleeding after 12 months without a period. That is never a normal part of menopause.
Your doctor may check your blood count and thyroid, and may order an ultrasound or a check of the uterine lining.
Pregnancy is still possible
You can still ovulate in perimenopause, even when periods are irregular. Use contraception until menopause is confirmed if you don’t want to conceive.
What can help
- Track your cycle. Note start dates, how heavy each period is and any spotting. A few months of notes make your appointment much more useful.
- Treat heavy bleeding. Your doctor can offer options such as a hormonal IUD, birth control pills or medicine taken during your period to reduce flow.
- Check your iron if periods are heavy or frequent.
- Look after sleep and stress. Both affect how you feel through the transition.
- Ease hot flashes with layers, a cool bedroom and less alcohol in the evening. Your doctor can offer treatment if they disrupt your sleep.
Irregular periods in perimenopause usually don’t need “fixing.” The goal is to rule out other causes and keep bleeding manageable. For everyday steps, see how to regulate periods naturally.
The traditional Chinese medicine view
In Traditional Chinese Medicine, the years around 49 are described as a natural decline of Kidney essence, the foundation of the reproductive cycle. Irregular periods in this stage are seen as part of that transition, often with signs TCM groups as Kidney yin deficiency, such as night sweats and heat, or Kidney yang deficiency, such as tiredness and feeling cold. These are traditional descriptions, not a diagnosis, and the medical checks above come first.
An external routine for the transition
If you’d like a routine that involves nothing swallowed, alongside your doctor’s plan, CycleBalance is one option. It is a sealed herbal pouch worn over the navel, held by a reusable belt and replaced every five days. It is not a treatment for heavy bleeding, fibroids or another medical cause, and it is not used when pregnancy is possible.
In Dr. Wang’s practice records from 2016 to 2022, seven women with irregular cycles used the CycleBalance formula, including two in their mid-40s. These were selected, uncontrolled cases, and at this age cycles can change on their own, so the records cannot show what caused any change or predict your result. Have your doctor check the cause of irregular bleeding before starting.
See CycleBalance’s directions →
Reviewed October 2026. Author: Qingcai Wang, MD, PhD, developer of the Five Essences external herbal-pouch formulations, with a commercial interest in their sale. General education only; continue your medical care.
Source: ACOG: perimenopausal bleeding and bleeding after menopause.
The routine behind this article
Feminine Vitality is the Five Essences external herbal pouch matched to this topic — worn on the body, nothing swallowed. One course is six pouches (about 30 days), with a fresh pouch every five days. $199 per course; the reusable belt is $15 if you don’t have one. Every first course is covered by the 90-Day First-Course Satisfaction Guarantee.
Wellness support, not medical care.
This article is part of our Women’s Core Health guide — cycle, fertility and postpartum, in one place.