You used to know what to expect from your period. Now it arrives early, disappears for weeks, or carries on long after you thought it would stop. You may find yourself planning meetings around bathroom breaks or checking your clothes before standing up.

Changes in menstrual timing and flow can happen during perimenopause. But a period that becomes much heavier, lasts longer than usual or disrupts daily life deserves medical attention. You do not have to wait until you feel unwell to raise it.

This guide explains which changes to discuss with a healthcare professional, when to seek urgent help and what information can make an appointment easier. It cannot identify the cause of your bleeding or provide a diagnosis.

When bleeding needs urgent attention

Seek urgent medical advice if you are soaking through a pad or tampon every hour for more than two hours. If heavy bleeding is accompanied by faintness, marked dizziness, chest pain or shortness of breath, seek emergency care immediately. Severe abdominal or pelvic pain also needs urgent assessment. Do not wait to reach a particular pad count if you feel seriously unwell.

If pregnancy is possible, unusual bleeding with abdominal or pelvic pain needs urgent medical attention. Irregular periods do not rule out pregnancy.

Why periods can change during perimenopause

As ovulation becomes less predictable, the hormonal signals that regulate the womb lining can become less regular too. Periods may come closer together or further apart, and bleeding may become lighter or heavier. A missed period does not necessarily mean that periods have finished.

These changes can help explain why your cycle feels unfamiliar. They cannot, by themselves, establish why a particular episode of bleeding is happening. Perimenopause and another gynaecological condition can occur at the same time.

What counts as heavy or prolonged bleeding

You do not need to measure blood loss in millilitres. The practical effect on your life matters. Useful details to mention include:

• Needing to change a pad or tampon every one to two hours because it is soaked, or emptying a menstrual cup much more often than usual.
• Bleeding through clothing or bedding, needing two types of protection together, or waking repeatedly to change protection.
• Bleeding for more than seven days, or noticeably longer than your usual period.
• Passing larger clots, particularly around 2.5 cm across or more.
• Missing work, cancelling plans or avoiding exercise because of bleeding.

These are reasons to have a conversation, rather than a checklist for diagnosing yourself. Menstrual products vary in absorbency, and a shorter period can still be excessively heavy. Describe what has changed for you.

Other bleeding changes worth checking

Arrange a medical appointment for bleeding between periods, bleeding after sex, or a new pattern that persists or keeps returning. Mention associated pain, pressure or unusual discharge. Even light spotting can be relevant when it happens outside your usual pattern.

Any vaginal bleeding after 12 months without a natural period should be checked, even if it happens only once or is just a small amount. Many causes are benign, but assessment is important because bleeding after menopause can sometimes be a sign of cancer. Hormonal medicines can make menstrual patterns harder to interpret, so tell your clinician what you take.

If you use HRT or hormonal contraception, report new, persistent or heavy bleeding to your prescriber. Whether bleeding is expected depends on the treatment and timing; do not assume it is harmless because you are taking hormones.

Why clinicians consider more than hormones

Possible explanations include fibroids, which are usually non-cancerous growths in the womb, and polyps, which are growths in its lining. Adenomyosis, where tissue similar to the womb lining grows within the muscle wall, can also cause heavy, painful periods. Certain medicines, including blood thinners, and bleeding disorders may contribute.

Less commonly, changes in the womb lining, including precancerous changes or cancer, can cause abnormal bleeding. This is one reason clinicians take a new pattern seriously. Being offered further checks does not mean that a serious condition has been found.

There is no reliable way to distinguish these causes from the colour of the blood, the appearance of a clot or an online symptom score.

Heavy periods and anaemia

Repeated blood loss can deplete iron and lead to iron-deficiency anaemia, reducing the blood’s ability to carry oxygen. Signs can include unusual tiredness, headaches, palpitations, breathlessness or looking paler than usual. These symptoms have other possible causes, so they need assessment rather than self-diagnosis.

It is easy to put exhaustion down to work, poor sleep or menopause. If your bleeding has changed too, mention both at your appointment. Singapore’s KK Women’s and Children’s Hospital also highlights the link between heavy or prolonged periods and symptoms of anaemia.

An iron-rich diet can support health, but it does not explain or stop abnormal bleeding. A clinician can advise whether iron treatment is needed while addressing the blood loss itself.

What a medical appointment may involve

The conversation usually starts with your bleeding pattern, its impact, medicines and relevant medical history. Depending on the circumstances, a clinician may discuss an examination, blood tests or further investigations. You can ask what each step is intended to clarify and what it will involve.

NICE recommends a full blood count for women with heavy menstrual bleeding. This is different from a hormone panel: routine female hormone testing is not recommended as the investigation for heavy periods. Other blood tests depend on the clinical picture.

An ultrasound or a hysteroscopy, which uses a thin camera to view the inside of the womb, may be considered. Some women need a sample of the womb lining. The appropriate approach depends on the history and individual risk factors; everyone does not need the same tests.

If an intimate examination is proposed, you can ask for an explanation, discuss discomfort or previous difficult experiences, and request a chaperone. In Malaysia and Singapore, a GP or gynaecologist can be a starting point for non-urgent concerns.

A simple record to bring to your appointment

A note on your phone or a paper diary is enough. Record what you can, but do not delay seeking care to complete it. The following details can help make your experience clear.

• Dates: when bleeding started and stopped, including spotting between periods or after sex.
• Flow: how often products needed changing, whether they were soaked, any leaks and approximate clot size.
• Symptoms: pain, dizziness, breathlessness, tiredness or palpitations, and when they occurred.
• Daily impact: interrupted sleep, missed work, cancelled activities or extra bathroom breaks.
• Background: medicines, HRT, contraception and supplements; relevant previous results; and whether pregnancy is possible.

For example, “I bled for nine days and woke twice a night to change a soaked pad” gives more useful detail than “my periods are bad”. You do not need photographs or exact measurements to be taken seriously.

Questions you may want to ask

• What needs checking before this change is attributed to perimenopause?
• Could the bleeding be affecting my blood count or iron levels?
• What options might reduce the bleeding, and how would my medical history affect the choice?
• When should we review this, and what should prompt earlier or urgent care?

Treatment options exist, and the discussion should take account of the cause, your preferences and any contraceptive or fertility needs. You do not have to simply wait for menopause while bleeding disrupts your life.

Frequently asked questions

Can perimenopause cause heavier periods?

Yes, flow can change during the transition. However, new heavy bleeding still deserves assessment rather than being automatically attributed to hormones.

Should a period lasting two weeks be checked?

Yes. Bleeding that continues for two weeks warrants medical review, even if it is not heavy throughout. Seek help sooner if the bleeding is heavy or you feel unwell; the urgent signs above take priority.

Should I wait until the bleeding stops to book?

You can contact a healthcare professional while you are still bleeding. Explain the amount, duration and any associated symptoms so they can advise on the timing and setting of care.

Making sense of the wider picture

Changes in your periods may be happening alongside disrupted sleep, hot flushes or other concerns. Having a place to reflect on these can make it easier to explain what you have been experiencing.

If you would like a gentle starting point, you can explore Neopause’s complimentary quiz to reflect on your symptoms and prepare questions for your healthcare professional. The quiz is educational; it cannot diagnose the cause of bleeding and should not delay a medical appointment or urgent care.

This article provides general health education, not a diagnosis or personalised medical advice.