What Is Menorrhagia?

Menorrhagia is the medical term for menstrual bleeding that is unusually heavy, unusually long, or both. It is also called heavy menstrual bleeding.

Diagnosis does not depend on a specific measurement of blood loss. Clinical guidance defines heavy menstrual bleeding by its effect: bleeding that is excessive and interferes with a person’s physical, social, emotional, or work life. Periods vary from person to person, so the pattern of bleeding and its impact on daily activities are what matter most.

• Soaking through a pad or tampon every hour or two for several hours

• Needing to change protection during the night

• Using double protection, such as a tampon with a pad

• Bleeding for more than seven days

• Passing blood clots larger than about 2.5 cm (roughly the size of a coin)

• Avoiding work, exercise, or social activities because of bleeding

Ongoing blood loss can also lead to iron-deficiency anaemia, a condition in which the body lacks enough red blood cells to carry oxygen. Signs include tiredness, pale skin, headaches and shortness of breath.

In many cases, doctors find no clear cause. When a cause is identified, it often falls into one of the following groups:

• Hormonal imbalance: Irregular ovulation, polyendocrine metabolic ovarian syndrome (PMOS), thyroid disorders and perimenopause can cause the uterine lining to build up and shed heavily.

• Uterine fibroids: Non-cancerous growths in the muscle wall of the uterus.

• Endometrial polyps: Small growths on the uterine lining.

• Adenomyosis: A condition in which the uterine lining grows into the uterine muscle.

• Bleeding disorders: Conditions such as von Willebrand disease, which affect blood clotting.

• Medicines: Anticoagulants (blood thinners) and, in some people, copper intrauterine devices.

• Pregnancy-related causes: Miscarriage or ectopic pregnancy can cause heavy bleeding that resembles a period.

Less commonly, thickening of the uterine lining (endometrial hyperplasia) or cancer of the uterus is responsible, which is one reason persistent changes in bleeding should be assessed. These are possible causes only and each case needs individual evaluation.

Assessment usually starts with a discussion of menstrual patterns, general medical history, family history of bleeding problems and current medicines. A physical or pelvic examination may follow.

Further investigations are chosen based on symptoms, age and medical history. They may include:

• Blood tests: A full blood count checks for anaemia and iron studies check for iron deficiency. Clotting tests or thyroid tests are used when indicated.

• Pregnancy test: Used where pregnancy is possible.

• Ultrasound scan: Looks for fibroids, polyps, or other structural changes.

• Further procedures: Examination of the uterine cavity with a camera (hysteroscopy) or a sample of the uterine lining (biopsy) are reserved for selected cases, such as persistent symptoms or treatment that has not worked.

Not every patient needs every test.

Treatment depends on the underlying cause, the severity of symptoms, medical history and whether future pregnancy is desired. Options that a doctor may discuss include:

• Non-hormonal medicines: Tranexamic acid reduces bleeding when taken during periods. Anti-inflammatory medicines such as mefenamic acid can also reduce flow and period pain.

• Hormonal treatments: A levonorgestrel-releasing intrauterine system, combined hormonal contraceptives, or progestogen tablets can lighten bleeding. The best option depends on individual health and contraception needs.

• Iron supplementation: Prescribed or recommended where iron deficiency or anaemia is present.

• Procedures and surgery: Endometrial ablation, removal of fibroids or polyps, uterine artery embolisation, or hysterectomy may be considered for selected cases when medicines are unsuitable or ineffective.

No single treatment suits everyone and one should not start medicines without medical advice. Cannabinoid-based medicines may have a potential role in managing certain types of pain. They are not an established treatment for menorrhagia and anyone considering them should consult a qualified healthcare professional. 

A medical appointment is advisable when heavy bleeding recurs across cycles, lasts longer than usual, disrupts daily life, or comes with signs of anaemia such as ongoing tiredness. Bleeding between periods, after sex, or after menopause also needs assessment.

• Dizziness or fainting

• Severe weakness

• Chest pain

• Breathlessness

Heavy bleeding during a possible pregnancy, especially with abdominal pain, also needs prompt evaluation. Early assessment allows a cause to be identified and effective treatment to be started.

Menorrhagia is more than just a heavy period. Persistent or prolonged menstrual bleeding can interfere with daily activities, affect quality of life and lead to iron-deficiency anaemia. While the causes range from hormonal changes and uterine conditions to bleeding disorders, effective treatment options are available.

Recognising the symptoms, understanding the possible causes and seeking timely medical evaluation can help identify the most suitable treatment. Since not every case requires the same approach, medical advice is essential for managing heavy menstrual bleeding safely and reducing the risk of complications.