Cycle, bleeding, fertility and diagnosis

Part 3 of 12 · All topics on the menopause

What can happen to your period

For some women, changes in the cycle are the earliest sign of the transition. A period suddenly comes earlier, then later again; there are months without a period, or the bleeding pattern changes. Such changes fit the menopausal transition, but they are not automatically harmless.

The international STRAW+10 criteria distinguish the phases of reproductive ageing, among other things, by characteristic changes in cycle length. They are a scientific framework for classification and not a self-test for use at home. In everyday life, what helps instead is watching your personal pattern and asking whether there are additional symptoms or warning signs. [1]

A helpful way to prepare for an appointment with your doctor is to note down, over a few months, the date, duration and approximate heaviness of your bleeding. This does not need to be an elaborate app; a calendar is enough. You can add hot flushes, sleep problems, pain or the use of hormonal products. Keeping records is worthwhile above all when it makes changes visible and clears up questions – not when it becomes a daily source of stress.

When bleeding needs to be checked

Unusual bleeding deserves a medical assessment in its own right. This includes in particular very heavy or prolonged bleeding, bleeding between periods, bleeding after sex and any new vaginal bleeding after a menopause has already been established. Which examination is appropriate depends, among other things, on age, medical history, bleeding pattern, medicines and the possibility of pregnancy.

Bleeding during hormone therapy also has to be assessed according to timing, product and course; it is neither normal across the board nor dangerous across the board. The NICE guideline updated its recommendations on unscheduled bleeding on systemic hormone therapy in 2026. [2]

Key sentence: A possible menopausal transition does not automatically explain every bleed. If you are unsure, or your bleeding is clearly unusual, a medical check is the right next step.

Do I need an FSH test?

For an otherwise healthy woman aged 45 or over who has typical hot flushes and newly occurring cycle changes, a perimenopause can, according to NICE, often be recognised clinically – without routine hormone tests. This is not because FSH or oestradiol are unimportant, but because their values change during the transition and single measurements often do not improve the assessment. [2]

For women aged 40 to 45 with corresponding symptoms and cycle changes, an FSH test may be considered to clarify the diagnosis. For women under 40 in whom premature ovarian insufficiency is suspected, more targeted investigation is particularly important. Hormonal contraceptives can make interpretation even harder. [2] [3]

Which tests make sense also depends on what other condition could be involved. With marked tiredness, a racing heart or changed bleeding, for example, examining other causes may, depending on the situation, be more important than the question of whether a particular FSH value “already looks menopausal”. No internet test should replace this clinical assessment.

Can I still get pregnant?

Yes. Irregular periods do not mean that ovulation has stopped. As long as pregnancy is biologically possible and not wanted, contraception remains a subject. The choice of method depends, among other things, on age, smoking, illnesses, medicines and personal preferences.

Especially important: classic menopausal hormone therapy is not a method of contraception. Conversely, hormonal contraceptives can change bleeding patterns or suppress bleeding, which makes the menopause harder to judge. An individual plan for continuing or stopping contraception should be discussed with a healthcare professional. [2] [4]

The question of contraception can feel awkward or beside the point when many menopause symptoms are happening at the same time. It still belongs on this page, because it has direct practical consequences and should not be lost sight of later.

What is different in a very early menopause

When ovarian function declines markedly before the 40th birthday, specialists speak of premature ovarian insufficiency. Medically, this is not simply an earlier version of the ordinary perimenopause. Besides clarifying the diagnosis, questions about wanting children, bone health, cardiovascular risks and hormone treatment can play a particular role. International professional societies have developed a guideline of their own, based on evidence, for this. [3]

An early menopause between the ages of 40 and 44 should not be brushed aside in passing either. Individual advice can differ from the general recommendations for people with a natural menopause around the average age. [5]

And if the womb has been removed?

After the womb has been removed, a natural period can no longer serve as a guide. Whether the ovaries have been kept is then especially relevant. If they have been removed as well, hormone levels and symptoms may change abruptly. If ovarian function is preserved, the menopause has to be assessed from other information. Certain cancer treatments also change the starting point.

The French clinical recommendations deal with such special cases explicitly. They show why, with hormonal contraception, hysterectomy and after cancer treatment, there cannot be a sensible general “twelve-month rule” as the only means of diagnosis. [4]

Preparing for the appointment: five helpful questions

1. Which of my symptoms fit a perimenopause – and what other causes should we check?
2. Is my bleeding unremarkable in my situation, or should I be examined?
3. Would a laboratory test change a treatment decision?
4. Do I still need contraception, and which method suits me?
5. What treatment options come into question for my most troublesome symptom?

If you already take medicines or supplements, it is worth bringing the complete list to the appointment. The same goes for any relevant illnesses of your own, earlier operations and significant illnesses in your family. This information is often more important for the later treatment decision than a single hormone value.

Which cycle changes can be typical

Some women first notice that their cycle becomes several days shorter. Others experience longer intervals, an occasional missed month or more irregular heaviness of bleeding. This can be an expression of the menopausal transition. Even so, the sentence “irregular is normal in the menopause years” must not become a blanket all-clear. The amount of bleeding, its duration, the gap compared with earlier cycles, other illnesses and personal risks all affect whether a medical examination makes sense.

Very heavy bleeding in particular is distressing. If you have to change pads or tampons several times during the night, pass larger blood clots or afterwards feel drained of energy, it is worth having it checked, regardless of whether the cause is later found to be hormonal or structural. Anaemia can make exhaustion worse. Polyps, fibroids, changes in the womb lining, medicines or clotting disorders are other possible factors. A conversation about your actual bleeding pattern is often more important than the question of whether your period is still “in the normal range”.

This does not mean that every somewhat heavier period is a warning sign. Good medicine asks about the relationship to your previous situation, takes warning signs into account and then decides whether, for example, an examination, an ultrasound or a blood count is necessary. You are explicitly welcome to explain what a bleed means for you: whether you have to cancel appointments, are limited at work or hardly sleep at night.

After twelve months without a period

The rule of twelve months without a period helps to determine the natural menopause in hindsight. It does not always apply in the same way, however, if hormonal contraception suppresses the bleeding, if the womb has been removed or if there are other medical causes. A menopause after a hysterectomy, for example, cannot be judged from periods, even though the ovaries may still be producing hormones. The professional assessment then relies on the history and symptoms. [2]

A new bleed after twelve months without a natural period should in principle be medically investigated. Often a benign cause lies behind it, but sometimes changes in the womb lining or other illnesses are relevant. Such a bleed should not be waved away as “probably a last cycle”. An early check brings clarity and, where needed, makes timely treatment possible.

In women who start or change hormone therapy, bleeding patterns can in turn be different. Some regimens provide for scheduled bleeds, others aim for no bleeding. Unscheduled bleeds have to be assessed by type, timing, treatment and personal risk factors. The joint guideline of the British Menopause Society on managing unscheduled bleeding on hormone therapy describes differentiated approaches for this, which cannot be replaced by a single rigid time rule. [6]

Contraception remains a subject in its own right

The menopause years and infertility are not the same thing. As long as ovulation is possible, a pregnancy can occur, even if it becomes statistically less likely with increasing age. An irregular period offers no reliable contraception. And menopausal hormone therapy is explicitly not a contraceptive. If a pregnancy is to be avoided, suitable contraception therefore belongs in the conversation with your doctor. [3]

Which method suits you depends, among other things, on age, smoking, migraine, blood pressure, risk of thrombosis and other illnesses. Combined hormonal contraception can change the bleeding pattern or mask typical hot flushes. Anyone using it cannot simply determine the menopause from missing bleeds or a single FSH value. A copper coil, a hormonal coil or other methods in turn have their own advantages and disadvantages. The decision is individual and should not rest on an age limit alone.

The question of when contraception can be stopped is particularly complicated when hormonal products alter the natural bleeding. Country-specific recommendations and individual risks should be taken into account. For a general account, it would be unsound to derive a universal go-ahead from any laboratory figure. A clear question for the appointment is therefore: “Which reliable method do I need now, and under what conditions can we stop it later?”

What an examination can clarify

A good conversation does not begin with a large blood panel but with your story. When was the last bleed? How regular were the cycles before that? Is there pain, unusual discharge or bleeding after sex? Which medicines and contraceptives do you use? Have there been procedures, cancer treatment or known hormonal illnesses? How severe are the symptoms, and what would count as an improvement for you?

Depending on the answers, a physical examination follows, possibly with an ultrasound, blood count, thyroid tests or other targeted tests. Often the question in the foreground is not “Is it the menopause?” but “What is causing this particular symptom?” For typical menopause symptoms from the age of 45, by contrast, a routine FSH test can be unnecessary. [2]

More important than as many measurements as possible is that at the end you know what should be ruled out and which next steps make sense. Good diagnosis can equally mean deliberately doing without a test that tells you little. Doing without tests should also be explained clearly, especially if you came to the surgery hoping for certainty.

The special situation before the 45th birthday

If typical symptoms appear at 41 or 42, the situation is viewed differently from that of a woman of 53. For people between 40 and 45, international guidelines name, under certain conditions, the possibility of using FSH to confirm a suspected early menopause. Before the 40th birthday, targeted diagnosis is important if POI is suspected. A single measured value without a suitable context should not carry the whole diagnosis. [2] [3]

If an early or premature menopause is confirmed, other long-term considerations come to the fore. In premature ovarian insufficiency, guidelines in many cases recommend hormone therapy up to roughly the usual age of the menopause, provided there are no contraindications. That is a different starting point from beginning hormone therapy at the age of 63. The particular features should be discussed explicitly with a specialist healthcare professional.

Fertility, wanting children and mixed feelings

Women do not all experience the menopause years as the end of the same story. Someone who no longer wants children may find the decline in fertility a relief. Someone who wants a child, or is undecided, may instead experience grief, time pressure or uncertainty. There are also women whose reproductive organs have been altered by operations or illnesses and whose experience does not fit the usual model of the cycle. All of these perspectives deserve a respectful account.

If you want children, early specialist advice is helpful. The age-dependent chances of pregnancy cannot be predicted from a hormone value alone. In this case the possible menopause is only one part of a wider assessment in reproductive medicine. A general guide can prepare the most important questions, but it cannot replace individual fertility counselling.

Three conversations that are often cut short

First: heaviness of bleeding. Many women report only “irregular periods”, although they have been suffering very heavy bleeding for months. You can give specific details: the number of particularly heavy days, changes at night, dizziness or limitations in daily life. This makes the problem easier to see.

Second: contraception. If a method has worked well for years, it is understandable that you do not want to change it. Even so, check whether age, new illnesses or medicines make a fresh assessment worthwhile. The choice should not depend only on the hope of being “probably no longer fertile anyway”.

Third: expectations of tests. Before any examination, ask what an abnormal or a normal result would actually change. If a measurement does not influence the decision, it can make sense to do without it. If it rules out an important alternative diagnosis, on the other hand, it can be very valuable. The aim is not as much diagnosis as possible but the right diagnosis for your situation.

A short checklist for the appointment

Note down the first day of your last three periods, as far as you know. Add what was normal for you before and what has changed. Add medicines and contraception, any relevant illnesses of your own or in your family, and the one question you absolutely want answered. A sheet of paper is enough. This preparation helps you to raise the essentials in the limited time available.

If you do not feel understood after an appointment, you may ask again or get a second professional opinion. The fact that the menopause years are a natural process does not mean that distressing bleeding disorders or pain have to go unattended.

Bleeding as information, not as a finding on its own

In the perimenopause, bleeding intervals and amounts often change. But bleeding is first of all a symptom that has to be put in context. How old are you? What did your cycle look like before? Do you use contraceptives or hormone therapy? Could you be pregnant? Is there pain or are there signs of anaemia? These questions are often more important than a quick classification as “normal” or “not normal”.

Heavy bleeding can, for example, be linked to structural changes in the womb, medicines or other illnesses. If you have to change pads or tampons very quickly, feel dizzy, pass large blood clots or have bleeding over a longer time that is clearly heavier than usual, you should seek medical help. Bleeding after twelve months without a natural period also needs to be checked. [2]

This does not mean that every irregular period is dangerous. The challenge is to tell common transitional changes apart from symptoms that need a different cause looked for or a different treatment. An expert conversation and, if necessary, an examination do this better than a blanket rule from a social media post.

Why a cycle calendar can be useful

If you have always had irregular periods, changes are harder to spot than with a previously very regular cycle. A short calendar can help to make the course visible. Note the start and roughly the heaviness of the bleed, as well as any spotting between periods or pain. You do not need to fill in apps every day or collect highly precise measurements for this. The record is particularly helpful if you are planning a medical check.

When interpreting it, it remains important that apps often use general average patterns as their yardstick. In the perimenopause, predictions can become less accurate. An app that calculates a pregnancy or a period is not a reliable medical diagnosis and does not replace a suitable method of contraception. If your bleeding is influenced by hormonal contraception, the calendar can in any case show natural ovarian activity only to a limited extent.

Pregnancy is less common, but not ruled out

With increasing age, fertility falls on average. That is a statistical statement, not reliable protection against conception. As long as ovulation is still possible, a pregnancy can occur. Precisely because cycles become irregular, the fertile time is harder to estimate. Hormone therapy for menopause symptoms does not replace contraception. Which method is suitable and when it can safely be stopped depends, among other things, on age and on the method used, and should be clarified with a healthcare professional. [2]

The situation is particularly difficult when women have menopausal symptoms and existing hormonal contraception at the same time. Some products change bleeding or suppress it entirely. It cannot simply be concluded from this that the natural menopause has already been reached. An FSH value can also tell you little under certain hormonal methods. Decisions about stopping contraception should therefore not depend on a single laboratory value or on bleeding having stopped alone.

Wanting children and early menopause

Someone who wants to become pregnant at 41 or 42 has different questions from a woman who absolutely wants to avoid another pregnancy. This page should respect both. If an early menopause is suspected, questions about ovarian function, about other causes and about available fertility options can carry considerable emotional and medical weight. Advice from suitably specialised healthcare professionals can then make sense. [5] [3]

Not every woman who reacts with sadness to an early menopause had an active wish for children. Some experience it as the loss of a familiar possibility or as a surprising sign of getting older. These feelings are allowed to have a place in medical advice. At the same time, it is important not to present information about risks and treatment options in an unnecessarily dramatic way.

Which examination can answer what

The medical history is almost always the first step. Depending on the symptoms, a physical examination, ultrasound, pregnancy test or targeted laboratory tests may come into question. Not every procedure is always needed. The aim is to answer a clear question: Is there a bleeding disorder that needs treatment? Is there another cause of tiredness or irregular cycles? Is an early menopause likely? Is the planned treatment suitable?

The French clinical recommendations on diagnosing the menopause, like NICE and the European endocrinology guideline, stress the importance of context, especially with contraception, operations and particular age groups. A result on a laboratory slip therefore makes sense only in connection with the medical history. [4] [2]

For bleeding on systemic hormone therapy, special considerations of timing and medical judgement also apply. The NICE guideline was updated on this in April 2026. Anyone starting or changing a therapy should know which bleeding can occur in the initial phase and when prompt investigation is important. The exact approach belongs in the conversation with your doctor. [2]

A conversation in which nothing important gets lost

It is helpful to bring a short overview to the examination: the date of the last bleed, changes in heaviness and intervals, medicines and contraceptives you use, possible pregnancy, accompanying symptoms and your biggest worry. Perhaps above all you want to know whether the bleeding needs to be checked. Perhaps it is about contraception or the possibility of an early menopause. Not every question has to be fully answered in the same appointment, but the priority should be clear.

Ask for a concrete explanation when a test is recommended: What is it meant to detect or rule out? How does the result change the treatment? What does a normal finding mean? In this way you avoid understanding tests as mere confirmation of a general “hormone disorder”. It is your right to receive information in language you can follow.

Read on: The page Hot flushes, sleep and exhaustion explains hot flushes and sleep problems. The pages Hormone therapy and Treatment without hormones compare treatment options; the basics of diagnosis are not presented in detail again there.