Heavy Periods (Menorrhagia): Symptoms, Causes and Treatment in the UK

In the UK, heavy periods—medically known as menorrhagia—are defined not just by the volume of blood lost, but by the impact the bleeding has on a person’s physical, emotional, and social life. While the average blood loss during a period is around 30 to 40ml, those with menorrhagia may lose 80ml or more.

However, measuring blood loss precisely is difficult. According to NHS guidance, you likely have heavy periods if you:

• Have to change your pad or tampon every 1 to 2 hours because it is soaked.
• Need to use 'double protection' (e.g., a tampon and a pad simultaneously).
• Wake up during the night specifically to change your sanitary products.
• Pass blood clots that are larger than a 10p coin (roughly 2.5cm).
• Experience 'flooding' through to your clothes or bedding.

It is important to remember that heavy periods are not something you simply have to 'live with'. Effective treatments are available through the NHS and private online GP services.

In many cases, a specific cause for heavy periods cannot be found. This is often referred to as dysfunctional uterine bleeding. However, several underlying health conditions can contribute to the problem:

Hormonal Imbalances

Fluctuations in oestrogen and progesterone can cause the lining of the womb (endometrium) to develop excessively. When this lining sheds, it results in heavy bleeding. This is particularly common during puberty or as women approach the menopause.

Uterine Fibroids

Fibroids are non-cancerous growths that develop in or around the womb. They are very common in the UK, particularly in women aged 30 to 50. They can cause the uterus to enlarge and increase the surface area of the lining that sheds each month.

Endometriosis and Adenomyosis

Endometriosis occurs when tissue similar to the womb lining grows elsewhere. Adenomyosis occurs when that lining grows into the muscular wall of the womb itself. Both conditions can cause significant pain and heavy bleeding.

Pelvic Inflammatory Disease (PID)

This is an infection of the upper female reproductive tract, often caused by an untreated STI. Chronic inflammation can lead to irregular and heavy bleeding.

The National Institute for Health and Care Excellence (NICE) provides clear pathways for managing heavy periods in the UK. Treatment usually starts with the least invasive options.

Levonorgestrel-releasing Intrauterine System (IUS)

Often considered the first-line treatment, the IUS (commonly known by the brand name Mirena) is a small plastic device inserted into the womb. It releases a progestogen hormone that thins the womb lining, significantly reducing blood loss and, for some, stopping periods entirely.

Non-Hormonal Medications

If you are trying to conceive or prefer not to use hormones, a GP may prescribe:

• Tranexamic acid: Taken during your period, it helps the blood in the womb to clot more effectively.
• NSAIDs (like Mefenamic Acid): These help reduce the production of prostaglandins, which can lower blood loss and alleviate period pain.

Hormonal Contraception

The combined oral contraceptive pill or the progestogen-only pill can help regulate the cycle and thin the endometrium, leading to lighter bleeds.

One of the most significant complications of menorrhagia is iron-deficiency anaemia. When you lose a large amount of blood every month, your body may struggle to replace the red blood cells quickly enough. This leads to a lack of iron, which is essential for carrying oxygen in the blood.

Symptoms of anaemia caused by heavy periods include:

• Feeling constantly tired or lethargic.
• Shortness of breath, even with light exercise.
• Palpitations (feeling your heart beating rapidly).
• Pale skin and brittle nails.

If you have heavy periods, your GP may recommend a blood test (Full Blood Count) to check your iron levels. Treatment often involves iron supplements alongside addressing the cause of the heavy bleeding.

If your periods are making it difficult to go to work, exercise, or leave the house, it is time to seek medical advice. You do not need to wait for your annual check-up to discuss menstrual health.

A private online GP can provide a calm environment to discuss your symptoms. During a consultation, the doctor will likely ask about:

• The length of your cycle and how many days you bleed.
• How often you change sanitary products.
• Any associated pain or pressure in your pelvic area.
• Your future plans regarding pregnancy.

Speaking to a GP online is a convenient way to get an initial assessment, discuss the pros and cons of different treatments like Tranexamic acid, and receive a referral for an ultrasound or specialist gynaecology services if required. They can also provide a sick note if your symptoms are currently preventing you from working.