World Menopause Day: Are Your Irregular Periods A Sign Of Perimenopause?

If periods have been regular previously, they could begin to occur sooner than usual, and may become irregular or heavier in your 40s. This is one of the first indicators for many women that they are in perimenopause, the transition to menopause. 

However, a shift in your period doesn't always indicate that your hormones are at fault. If the periods are irregular during the perimenopause stage, this is normal, but if there is heavy bleeding between periods, between periods or after the menopause then this is a medical emergency. On World Menopause Day, observed on 18 October, here is how to tell the difference.

Why Do Periods Become Irregular In Your 40s?

Perimenopause changes the way the ovaries release eggs and produce hormones. During the reproductive years, ovulation tends to be quite regular, but it becomes less regular as you age. This impacts on the quantity of oestrogen and progesterone that controls the menstrual cycle.

Dr Lavanya Kiran, Director and Lead Consultant, Obstetrics, Gynaecology, KIMS Hospitals, Electronic City, Bengaluru explains, “Because ovulation stops being reliable.” Some cycles have an egg, others don't, she adds. If ovulation is absent, the progesterone level may not increase normally, which can result in alterations of the womb lining and menstruation.

Dr Spoorthi Prakash, Consultant Obstetrician at Altius Hospital, HRBR Layout, Bengaluru, explains that, “some women notice that due to a weak corpus luteum and less progesterone, their flow becomes lighter and more brown.”.

What Changes In Your Periods Are Normal During Perimenopause?

The pattern may evolve over time. There may be shorter cycles at the start of transition. Subsequently, the periods may become farther apart and some women may go without even a single period for several months.

“Cycles get shorter,” says Dr Kiran, as in early perimenopause; there can be gaps of more than 60 days in late perimenopause. Menopause is only confirmed by 12 consecutive months without a period, if there is no other reason.

Changes that can occur during perimenopause include:

• Having periods that show up sooner or later than normal.
• A skipped period followed by another cycle.
• Flow that varies from light to heavy.
• Menstrual changes, poor sleep and/or night sweats or mood changes.

It may take a few years to transition. But, bleeding that changes doesn't necessarily mean it's a sign of perimenopause, particularly if it's new, heavy or persistent.

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Which Period Changes Are Not Normal And Need A Check?

Heavy periods following a prolonged period may occur during perimenopause, but there are limits on what is considered normal.

“Heavy bleeding, long periods or a sudden onset of pain during periods could be a sign of fibroids, adenomyosis or endometrial hyperplasia,” Dr Prakash cautions. They should be properly evaluated, not necessarily related to hormonal changes.

If you experience any of the following, see a gynaecologist:

• Heavy periods or bleeding during or after sex.
• Any period of more than 7 days.
• Heavy bleeding that penetrates a pad or tampon within an hour, for multiple hours.
• Cycling periods less than 21 days.
• Increased or new pelvic pain.
• Fatigue, giddiness or breathlessness (may be a sign of anaemia).
• Any bleeding after 12 months without a period. 

A 2023 clinical review on abnormal uterine bleeding discusses why unusual bleeding needs assessment. The review notes that abnormal uterine bleeding is a common reason women seek medical care, and that evaluation helps identify the cause and guide treatment.

Could Something Other Than Perimenopause Be Causing Irregular Periods?

Yes. Pregnancy, thyroid problems, PCOS, fibroids, polyps, significant weight changes, stress and certain medicines can all affect menstrual patterns.

Dr Prakash says that “many conditions like thyroid hormonal variations and pregnancy can present in the same way”. This is why a consultation matters, particularly when a period suddenly changes or stops unexpectedly.

Depending on your symptoms, your doctor may suggest a pregnancy test, thyroid function tests, a blood count or a pelvic ultrasound. Persistent or heavy abnormal bleeding may need further investigation of the womb lining.

Do You Need A Hormone Test To Confirm Perimenopause?

Not always. Hormone levels can change from day to day, so one blood test may not reflect what is happening across the menstrual cycle.

Dr Kiran explains that, for many women in their 40s, the diagnosis depends on their age, symptoms and menstrual pattern rather than one test result.

The NICE menopause guidance, updated in 2024, advises that menopause can generally be identified clinically in otherwise healthy women aged 45 and over who have typical symptoms. Blood tests may be considered in some women aged 40 to 45, or younger women in whom early menopause is suspected.

Can You Still Get Pregnant When Your Periods Become Irregular?

Yes. Irregular periods are not necessarily a complete cessation of ovulation. It's possible to release an egg even if you skip periods for a few weeks or months.

Dr Kiran stresses that contraception is required as long as it is medically necessary, and until the end of perimenopause. If you think you could be pregnant, but have not had a period, consider taking a pregnancy test, not assuming menopause has arrived.

ALSO READ- Period Came Early This Month? Expert-Approved 7 Reasons It May Happen

What Can Help Manage Irregular Periods In Your 40s?

Appropriate treatment will depend on the nature, or cause, of the change and its impact on the person's life. “A doctor can get a good idea of the pattern by keeping track of the dates of your cycles for a couple of months,” Dr Kiran says.

Medicines to help reduce heavy bleeding, hormone therapy, and/or iron may be prescribed if results of tests indicate a deficiency of iron. A gynaecologist can also discuss menopause symptoms like hot flushes and sleep issues.

Get medical help if periods become disruptive in daily life, there is any warning sign above or you are not sure if symptoms are due to perimenopause.

To change the discussion from guessing to paying attention to menstrual changes, World Menopause Day is a reminder. Having irregular periods may be a normal part of transitioning, but it is best to have any unusual bleeding evaluated.