Period Problems and Abnormal Bleeding: What’s Normal and When to Seek Help?

Changes to your menstrual cycle can happen for several reasons. Some are linked to natural hormonal fluctuations, while others may indicate an underlying condition that needs investigating.

Understanding what is normal for you, recognising unusual bleeding patterns and knowing when to seek medical advice can help you take the next step with greater confidence.

What Is Normal Menstrual Bleeding?

There is no single menstrual pattern that is normal for every woman. Some have relatively short, light periods, while others experience longer cycles or heavier bleeding.

As a general guide, menstrual cycles in adults often last between 21 and 35 days, with bleeding typically continuing for two to seven days. However, these ranges do not tell the whole story. Your usual pattern, symptoms and how your periods affect everyday life are equally important.

If your periods have always been regular but suddenly become unpredictable, or your bleeding is noticeably heavier than before, it is worth understanding why.

The medical term abnormal uterine bleeding describes bleeding from the uterus that differs from expected menstrual patterns. This may involve changes in frequency, duration, regularity or the amount of blood lost.

Not every change means something serious is wrong. However, persistent or unexpected bleeding should not be dismissed, particularly when it represents a significant change for you.

What Are the Different Types of Period Problems?

Period problems can involve changes to your menstrual flow, the timing of your cycle or symptoms that occur alongside bleeding.

Recognising the type of change you’re experiencing can help your gynaecologist understand what might be causing it.

Heavy Periods

Heavy menstrual bleeding, also known as menorrhagia, is not defined simply by how much blood you lose. What matters is whether the bleeding interferes with your physical, emotional or everyday wellbeing.

You might find yourself changing sanitary products more frequently than usual, using additional protection, passing large blood clots or worrying about bleeding through your clothes or bedding.

For some women, heavy periods make it difficult to work, exercise, travel or sleep comfortably.

Repeated heavy bleeding can also lead to iron deficiency anaemia, which may cause tiredness, weakness, breathlessness or dizziness.

Irregular or Prolonged Periods

An irregular menstrual cycle means your periods do not follow a consistent pattern. They may arrive earlier than expected, become increasingly spaced apart or occasionally be missed altogether.

Periods can also become prolonged, with bleeding continuing for longer than your usual duration, sometimes beyond seven days.

Occasional changes are common, particularly during adolescence and perimenopause. However, ongoing irregularity or prolonged bleeding may be associated with hormonal changes, problems with ovulation or conditions affecting the uterus.

Bleeding Between Periods

Bleeding between periods, sometimes called intermenstrual bleeding, can range from light spotting to more noticeable blood loss.

Possible explanations include hormonal contraception, cervical changes, infections or growths such as uterine polyps.

Bleeding after sex is another symptom that should be assessed. Although it can have several non-serious causes, including cervical inflammation or vaginal dryness, it is important to identify the reason rather than assume it is harmless.

Painful Periods

Some discomfort during menstruation is common, but severe pain that disrupts your normal activities deserves attention.

Painful periods, medically known as dysmenorrhoea, may occur without an underlying condition. However, persistent or worsening pain can sometimes be associated with endometriosis, adenomyosis or fibroids.

Painful periods are not necessarily a form of abnormal bleeding, but pain and changes in menstrual flow can occur together.

What Can Cause Abnormal Vaginal Bleeding?

There are several possible causes of abnormal vaginal bleeding, and the explanation often depends on your age, medical history, contraception and the particular symptoms you’re experiencing.

A change in your bleeding pattern can provide useful clues, but it cannot establish a diagnosis on its own.

Hormonal Changes and Ovulation

Your menstrual cycle is controlled by hormones, including oestrogen and progesterone. These regulate the development and shedding of the lining of the uterus.

When ovulation becomes irregular, bleeding may become unpredictable. Some women experience missed periods followed by heavier bleeding, while others notice changes in cycle length or frequency.

Hormonal fluctuations are common during perimenopause, but irregular ovulation can also be associated with polycystic ovary syndrome (PCOS), thyroid disorders and other medical conditions.

Fibroids and Uterine Polyps

Fibroids are non-cancerous growths that develop in or around the uterus. Some cause no symptoms, while others contribute to heavy or prolonged periods, pelvic pressure or discomfort.

Their effect on bleeding often depends on their size and location.

Uterine polyps are growths that develop from the lining of the womb. They may cause bleeding between periods, irregular bleeding or changes in menstrual flow.

Both conditions can sometimes be identified through investigations such as pelvic ultrasound or hysteroscopy.

Adenomyosis and Endometriosis

Adenomyosis occurs when tissue similar to the uterine lining grows into the muscular wall of the uterus. It can cause heavy periods, significant menstrual pain and pelvic discomfort.

Endometriosis involves tissue similar to the lining of the uterus growing elsewhere in the body, most commonly within the pelvis.

Pain is a prominent symptom of endometriosis, particularly during menstruation, although symptoms vary considerably between women.

Because these conditions can share symptoms with other gynaecological problems, further assessment may be needed to understand what is happening.

Contraception, Medication and Other Causes

Hormonal contraception can affect menstrual bleeding, especially when starting a new method or changing contraception. Some women experience lighter periods, while others notice spotting or irregular bleeding.

Certain medicines, including anticoagulants used to reduce blood clotting, may also contribute to heavier bleeding.

Other possible causes include infections, cervical abnormalities and changes affecting the lining of the uterus.

Less commonly, unexpected bleeding can be associated with precancerous changes or cancer. This is one reason persistent abnormal bleeding, particularly after menopause, needs appropriate assessment.

Pregnancy-related bleeding also requires separate consideration. If pregnancy is possible, unexpected bleeding may need investigation to exclude complications such as miscarriage or ectopic pregnancy.

How Can Perimenopause Affect Your Periods?

Perimenopause is the transitional stage leading up to menopause. During this time, hormone levels fluctuate and ovulation may become less predictable.

Your periods might arrive closer together, become more widely spaced or vary in heaviness. You may occasionally miss a period before your cycle resumes.

These changes can occur alongside symptoms such as hot flushes, night sweats, sleep difficulties, mood changes or vaginal dryness.

However, not every bleeding change during perimenopause should automatically be attributed to hormones.

If your periods become particularly heavy, you experience persistent bleeding between cycles or notice bleeding after sex, it is sensible to seek medical advice.

Menopause is generally recognised once you have gone 12 consecutive months without a period, provided there is no other explanation for the absence of menstruation.

Any vaginal bleeding after menopause should be assessed promptly, even if it is only light spotting or happens once. Although there are several possible causes, including thinning of vaginal or uterine tissues and polyps, investigation is important to rule out more serious conditions.

When Should You Seek Medical Advice About Abnormal Bleeding?

It can be difficult to know when a change in your periods needs medical attention, particularly if your symptoms come and go.

The timing, severity and pattern of bleeding can help determine how quickly you should seek advice.

When to Book a Gynaecology Appointment

Arrange a medical assessment if you notice:

• Heavy periods affecting everyday life: Particularly if you regularly experience flooding, need frequent changes of menstrual products or feel unusually tired.
• Persistent irregular periods: Especially when your cycle has changed significantly from its usual pattern.
• Bleeding between periods: Including recurring spotting or bleeding that occurs unexpectedly.
• Bleeding after sex: Even if it is light or does not happen every time.
• Periods lasting longer than usual: Particularly when bleeding continues beyond seven days or becomes a recurring problem.
• Severe or worsening period pain: Especially when it affects work, sleep or normal activities.

Bleeding after menopause should also be assessed promptly, even when it stops without treatment.

When Is Urgent Medical Attention Needed?
Very heavy bleeding can sometimes require urgent medical care, particularly if it is accompanied by fainting, marked dizziness, severe weakness or breathlessness.

If you might be pregnant and experience vaginal bleeding with severe abdominal or pelvic pain, shoulder-tip pain, dizziness or fainting, seek emergency medical attention. These can be warning signs of an ectopic pregnancy.

Do not wait for a routine gynaecology appointment if you are experiencing potentially serious symptoms. Call 999 or attend an emergency department if you are severely unwell.

What Should You Track If Your Periods Change?

If your menstrual cycle has become irregular or your bleeding has changed, keeping a record of your symptoms can make a consultation more useful.

You do not need to measure blood loss precisely. A simple diary, calendar or period-tracking app is often enough.

It can help to note:

• When bleeding starts and stops: Including spotting between periods.
• How heavy the bleeding feels: Such as how often you change sanitary products or whether you experience flooding or clots.
• Any associated pain: Including where it occurs, how severe it is and whether it affects your daily activities.
• Other symptoms: Such as tiredness, dizziness, pelvic pressure or changes in vaginal discharge.
• Medication or contraception changes: Particularly if your symptoms began around the same time.

These details can help identify patterns and guide decisions about further investigation.

You do not need to collect several months of information before seeking help. If bleeding is persistent, unusual or concerning, arrange an assessment rather than waiting for a clearer pattern to emerge.

How Are Period Problems and Abnormal Bleeding Investigated?

The first step is usually a conversation about your symptoms.

Your gynaecologist will want to understand your usual menstrual cycle, when the changes began, how much bleeding you experience and whether you have associated symptoms such as pelvic pain.

Your medical history, medication, contraception and the possibility of pregnancy may also be relevant.

Depending on your symptoms, a physical examination or further investigations may be recommended. Not everyone needs the same tests, and an internal examination or procedure is not automatically necessary.

Blood Tests

If you have heavy periods, a full blood count may be recommended to check for anaemia.
Other blood tests may be appropriate when your symptoms or medical history suggest a particular underlying condition.

Pelvic Ultrasound

A pelvic ultrasound allows the clinician to examine the uterus and ovaries.

It may help identify fibroids, certain uterine abnormalities or ovarian conditions that could be contributing to your symptoms.

A transvaginal ultrasound, which uses a small ultrasound probe placed inside the vagina, can provide more detailed images when appropriate. Your clinician should explain what the examination involves and discuss it with you beforehand.

Hysteroscopy

A hysteroscopy uses a thin camera to examine the inside of the uterus.

It may be recommended if there is concern about a polyp, a fibroid affecting the uterine cavity or another condition involving the lining of the womb.

Your clinician can explain why the procedure is being considered, what it involves and the available options for managing discomfort.

Endometrial Biopsy

An endometrial biopsy involves taking a small tissue sample from the lining of the uterus for examination.

It may be recommended for certain patterns of abnormal bleeding, particularly when there are concerns about changes to the uterine lining.

The purpose of these investigations is to understand the cause of your symptoms so that any treatment can be based on an appropriate diagnosis.

What Treatments Are Available for Period Problems?

There is no single treatment that suits every woman with abnormal bleeding.

The most appropriate approach depends on the underlying cause, the severity of your symptoms, your medical history and your personal preferences.

For heavy menstrual bleeding, non-hormonal medicines such as tranexamic acid or certain anti-inflammatory medicines may be considered where suitable.

Hormonal treatments, including some contraceptive methods and the levonorgestrel-releasing intrauterine system, can also help manage bleeding in appropriate circumstances.

If fibroids, polyps or another structural condition are contributing to your symptoms, a procedure may sometimes be recommended.

Treatment decisions should also consider whether you wish to become pregnant in the future, as some options may affect fertility or pregnancy planning.

In some situations, monitoring may be appropriate. In others, treatment can help reduce bleeding, relieve symptoms or address an underlying condition.

Understanding the cause is an important part of choosing the right approach.

Getting Help for Period Problems at Harley Women’s Health

If your periods have become heavier, more painful or less predictable, discussing the changes with a gynaecologist can help you understand what may be happening.

At Harley Women’s Health in Harley Street, Central London, consultations are led by Ms Lubna Haque, a Consultant Gynaecologist and Obstetrician with more than 20 years of experience in obstetrics and gynaecology.

Her clinical interests include menstrual disorders, fibroids, endometriosis, pelvic pain, ovarian cysts and perimenopause.

Your appointment begins with a discussion of your symptoms, menstrual history and any concerns you may have. Depending on the findings, investigations such as pelvic ultrasound, blood tests, hysteroscopy or endometrial assessment may be considered.

Where clinically appropriate, the clinic’s one-stop approach allows consultations and relevant investigations to be organised within the same care pathway, helping make the process of understanding your symptoms more straightforward.

Whether you are experiencing heavy periods, unexpected spotting or bleeding that feels different from your usual cycle, you can discuss your concerns and the next steps for investigation or treatment.

Book a Gynaecology Consultation at Harley Women’s Health

Frequently Asked Questions

Can Stress Cause Irregular Periods?

Stress can affect the hormonal signals involved in ovulation, which may cause periods to arrive later than expected or become temporarily irregular.

However, ongoing changes should not automatically be attributed to stress. If your periods remain unpredictable or you experience other symptoms, medical assessment can help identify possible causes.

Can Heavy Periods Cause Anaemia?

Yes. Repeated heavy menstrual bleeding can reduce your body’s iron stores and lead to iron deficiency anaemia.

Symptoms may include fatigue, weakness, dizziness and breathlessness. A blood test can help determine whether anaemia is present, while further assessment can identify what is contributing to the bleeding.

Is Bleeding After Sex Always a Sign of Something Serious?

No. Bleeding after sex can occur for several reasons, including vaginal dryness, cervical changes, inflammation or infection.

However, it should still be assessed, even if the bleeding is light. An examination and any appropriate investigations can help establish the cause.

Can Abnormal Bleeding Go Away on Its Own?

Some changes in menstrual bleeding settle without treatment, particularly when associated with temporary hormonal fluctuations or changes in contraception.
However, persistent or recurring abnormal bleeding should not be ignored simply because it occasionally improves.
Bleeding after menopause always requires assessment, even if it happens only once and stops on its own.