Irregular and Heavy Periods in Perimenopause

Periods change before they stop, and the changes can be alarming: cycles that come every three weeks, then vanish for two months, floods that soak through clothes, spotting that arrives from nowhere. Most of this is normal perimenopause, the ovaries ovulating erratically on the way to not ovulating at all. Some of it isn’t, and the distinction matters more here than with any other menopause symptom, because heavy and erratic bleeding at midlife is also how fibroids, polyps and, occasionally, cancer of the womb lining show up. This page describes what’s expected, what always needs checking, and what actually treats heavy perimenopausal bleeding, which is not menopausal hormone therapy.

What’s normal in perimenopause

Researchers divide the transition into stages by period pattern:

• Early perimenopause. Cycles become variable by a week or more. Many women notice cycles shortening first, to 21 to 25 days, because the first half of the cycle gets quicker. Flow often gets heavier, sometimes much heavier, as cycles without ovulation let the lining build up.
• Late perimenopause. Cycles lengthen and skip; a gap of 60 days or more marks this stage. Hot flashes usually peak here. Periods when they come may be light or unexpectedly heavy.
• Menopause. Twelve months without a period. The average age is 51; see when menopause starts.

Normal perimenopause includes: cycles anywhere from three to eight weeks apart, flow heavier or lighter than before, periods lasting a day or two longer, occasional spotting mid-cycle, and PMS-like mood swings and bloating that are worse than they used to be. You can still conceive during all of it; see pregnancy in perimenopause for the contraception rules.

Why periods change

A regular cycle depends on an egg being released mid-cycle and the progesterone that follows. In perimenopause the ovaries’ egg supply is running down, the brain signals harder (FSH rises), and ovulation becomes hit and miss. In cycles without ovulation there’s no progesterone, estrogen keeps the lining growing unchecked, and the result is a late, heavy, clotty period, or spotting as bits of a thick lining shed. In cycles where ovulation comes early, the period comes early. Estrogen itself swings high and low, which is why symptoms are often worse in perimenopause than after menopause. Our guide to perimenopause vs menopause explains the hormones.

Bleeding that always needs a doctor

Perimenopause explains a lot, but it’s a diagnosis made after other causes are excluded. See a clinician promptly, meaning within days to a couple of weeks, for:

• Any bleeding after 12 months without a period, including spotting. Every time. It’s usually a thin, fragile lining or vaginal tissue changes, but it’s the main symptom of endometrial cancer, which is very treatable when caught early.
• Very heavy bleeding: soaking a pad or tampon hourly for two hours or more, clots larger than a quarter, or bleeding that makes you faint, breathless or exhausted.
• Bleeding lasting more than seven days, or cycles persistently shorter than 21 days.
• Bleeding between periods or after sex that is new or recurring.
• Bleeding on hormone therapy that persists beyond the first six months, or starts after a settled pattern.
• Heavy bleeding with a family history of womb, ovarian or bowel cancer, or if you have never had children, have PCOS, diabetes or a high body weight, all of which raise the risk of a thickened lining.

The assessment is straightforward: an examination, a pelvic ultrasound to measure the lining and look for fibroids and polyps, blood tests for anaemia and thyroid, and sometimes a small sample of the lining. Most results are reassuring. Please don’t put up with flooding because “it’s just perimenopause”; it’s often fibroids or a polyp, both of which are fixable.

Other causes at this age

Cause	Clue
Fibroids	Heavy, prolonged periods; pelvic pressure; very common in the 40s
Polyps	Spotting between periods or after sex
Adenomyosis	Heavy, painful periods; an enlarged, tender womb
Thyroid disease	Heavy periods (underactive) or light, infrequent ones (overactive)
Endometrial hyperplasia	A thickened lining from unopposed estrogen; needs treatment because it can progress
Bleeding disorders or blood thinners	Heavy periods since the teens, easy bruising, or a new anticoagulant
Pregnancy	Still possible; a missed period plus bleeding needs a test
Cervical causes	Bleeding after sex; make sure screening is up to date

Does HRT stop irregular periods?

No, and this is a common misunderstanding. Menopausal hormone therapy is dosed to treat hot flashes, sleep and mood, not to control a cycle, and in a woman who is still ovulating it can make bleeding less predictable. The treatments for heavy or erratic perimenopausal bleeding are different:

1. A hormonal IUD (levonorgestrel). The most effective non-surgical treatment for heavy bleeding, cuts flow by most, provides contraception, and protects the lining. It can later be paired with estrogen as the progestogen half of menopausal hormone therapy, which makes it an elegant bridge through the transition.
2. The combined pill, for non-smoking women without migraine with aura, clots or high blood pressure, usually up to 50. Regulates cycles, treats hot flashes and provides contraception.
3. Cyclic progesterone, ten to fourteen days a month, for women who can’t or don’t want the above; restores a predictable, lighter period.
4. Tranexamic acid, taken only on heavy days, reduces flow by about a third to a half without hormones. NSAIDs (ibuprofen, naproxen) started at the onset of bleeding reduce flow and cramps.
5. Iron. Heavy periods cause iron deficiency and the fatigue, hair shedding and brain fog that go with it; check ferritin and replace it.
6. Procedures when a fibroid or polyp is the cause: polyp removal, fibroid treatments, endometrial ablation, and, for some women, hysterectomy.

Once periods have stopped, the question changes to whether menopausal hormone therapy is right for your other symptoms, and the IUD or pill can be swapped for it.

Getting help

Perimenopausal bleeding sits at the border of what telehealth can do. Golden Leaf’s care team can talk through your pattern, say whether it fits normal perimenopause, treat the symptoms around it, and advise on the hormonal options, including an IUD, which is placed in person. If your bleeding has any of the warning features above, you need an examination and ultrasound first, and we’ll tell you so directly rather than prescribe around it. Book a first visit to talk through your cycle, or see your gynaecologist this week if you’re flooding.

Sources: ACOG, Perimenopausal bleeding and bleeding after menopause; Mayo Clinic, Perimenopause; National Institute on Aging, What is menopause?; The Menopause Society.