Hypomenorrhoea (light menstrual bleeding) – causes & treatment

Every woman's body follows its own rhythm, and periods aren't always the same. Sometimes they're heavy, sometimes lighter. Yet throughout your life, your period is a subtle mirror of your inner balance. When menstrual bleeding becomes increasingly light or almost stops altogether, your body may be telling you, in its own way, that it needs more attention.

This article looks at hypomenorrhoea – a menstrual disorder characterised by an unusually small amount of bleeding during your period. Find out what can cause this change, how to recognise it and how you can support your body.

What is hypomenorrhoea 

Hypomenorrhoea is a menstrual cycle disorder characterised by unusually light periods.

In women with a healthy cycle, menstruation lasts on average between 2 and 7 days. The amount of blood lost during this time is normally between 30 and 80 ml. However, if your bleeding lasts fewer than 3 days, you lose less than 30 ml of blood and you need noticeably fewer menstrual products than usual, this is known as hypomenorrhoea.

Depending on when it appears, hypomenorrhoea is divided into two categories: primary and secondary. Primary hypomenorrhoea is when bleeding has been light right from the very first period. If the condition develops over time, after periods were previously normal, it is classed as secondary hypomenorrhoea.

How does hypomenorrhoea develop – causes 

There are stages of life in which hypomenorrhoea is perfectly normal, such as when periods first begin or during the perimenopause. In adolescents, it's normal for the first periods to be lighter until the cycle settles into a pattern. Before the menopause, it's equally normal for bleeding to become lighter, as oestrogen production declines.

However, throughout life there are many other situations in which hypomenorrhoea may point to hormonal changes or a problem with the lining of the womb. Possible triggers include stress, sudden changes in weight or the use of certain contraceptive methods. Here are the most common causes:

• Physiological factors: Lighter bleeding due to hormonal changes is normal at certain stages of life, such as during puberty, the perimenopause, pregnancy and breastfeeding.
• Hormonal imbalances: Low oestrogen levels can lead to a thinner womb lining, raised testosterone levels can affect ovulation (for example in patients with polycystic ovary syndrome), and thyroid disorders such as hypothyroidism or hyperthyroidism can affect the entire hormonal system. All of these changes can cause lighter periods.
• Hormonal contraceptives: The pill, the coil and other hormonal contraceptive methods thin the lining of the womb to prevent pregnancy – they are among the most common causes of hypomenorrhoea. When the body has less lining to shed during menstruation, lighter bleeding is entirely normal.
• Conditions affecting the womb: Intrauterine adhesions (synechiae) or damage to the uterine cavity following a dilation and curettage or other previous procedures can trigger hypomenorrhoea.
• Other causes: stress, sudden weight loss, intense physical activity, anaemia.

Complications and risks of hypomenorrhoea 

Hypomenorrhoea in itself is not a serious health problem, but as a menstrual disorder it can point to other conditions. It may be a symptom of other issues, such as hormonal imbalances or conditions affecting the womb, which can lead to serious complications if left untreated.

Infertility and early onset of the menopause are the most common consequences. In addition, the conditions that cause hypomenorrhoea can also bring about severe pain, unusual bleeding between periods and other menstrual disturbances. Over time, these changes can also have a psychological impact, such as lowered self-esteem, loss of sexual desire and even depression.

Symptoms of hypomenorrhoea 

Lighter bleeding and a shorter period are the clearest signs of hypomenorrhoea. Light menstrual bleeding is defined as either losing less than 30 ml of blood during a period or losing 20% less than in previous cycles.

Alongside these clinical signs, other symptoms may occur:

• Mild to moderate lower abdominal pain, particularly when the hypomenorrhoea is due to conditions affecting the womb.
• Infertility, when the hypomenorrhoea is linked to a lack of ovulation or an overly thin womb lining.
• Hormonal disturbances associated with absent ovulation or highly irregular cycles.

Hypomenorrhoea may also be accompanied by general symptoms such as fatigue, mood swings, insomnia, acne and other signs of hormonal imbalance.

For many women, these changes bring emotional strain and can affect their quality of life. Hypomenorrhoea can be accompanied by increased stress, feelings of anxiety or lower self-esteem – especially when difficulties conceiving are also involved.

When to see a doctor about hypomenorrhoea 

Your period can change from month to month, depending on your lifestyle, stress levels and other factors. Light bleeding is therefore not always a cause for concern. Even so, you should contact your doctor if:

• your bleeding has suddenly become considerably lighter
• your periods are infrequent and irregular
• your period is accompanied by severe pain
• you think you may be pregnant
• you aren't pregnant but have missed your period 3 months in a row
• you have vaginal bleeding outside your period

How is hypomenorrhoea diagnosed 

Hypomenorrhoea is diagnosed primarily on the basis of your medical history and a gynaecological examination. Your doctor will ask you questions about how heavy and how long your periods have been, carry out a gynaecological examination and may recommend further tests:

• Transvaginal ultrasound to assess the womb and ovaries and to identify any possible conditions affecting the womb.
• Hormone tests to detect any hormonal imbalances.
• Hysteroscopy for a detailed examination of the uterine cavity, particularly where intrauterine adhesions or other changes are suspected.

Treatment of hypomenorrhoea 

Where hypomenorrhoea has physiological causes, such as during puberty or the perimenopause, no treatment at all is often needed. In all other cases, treatment always depends on the underlying cause of the change in your periods.

In the case of a hormonal imbalance, hormone therapy may be recommended to regulate oestrogen or progesterone levels.

If a hysteroscopy confirms the presence of fibroids or uterine polyps and these are linked to the hypomenorrhoea, they can be removed during the procedure. Surgery may also be indicated if abnormal endometrial tissue needs to be removed.

How to prevent hypomenorrhoea 

Many of the health problems that lead to hypomenorrhoea – such as hormonal imbalances, excessive stress, anaemia or sudden weight fluctuations – can be avoided by living as balanced a lifestyle as possible.

Make sure you eat a nutrient-rich diet with foods high in vitamins and minerals, in order to maintain a healthy weight and prevent deficiencies.

Avoid restrictive diets and excessive physical strain to prevent sudden weight loss. Instead, opt for moderate exercise to keep an active lifestyle, try to avoid stress and overwork, and allow yourself plenty of rest.

Last but not least, you should have your blood values checked regularly and attend routine gynaecological screenings, so that health problems can be picked up early and complications prevented.

Frequently asked questions about hypomenorrhoea 

Do you still have questions about hypomenorrhoea? We hope to provide the answers you're looking for below. In this section we answer the most common questions about light periods: how to recognise hypomenorrhoea and how it affects your life.

How do you tell hypomenorrhoea apart from other menstrual disorders? 

Hypomenorrhoea refers to a reduced amount of blood during your period or a shortening of the bleeding to 1–2 days. Unlike amenorrhoea, in which periods stop altogether, or oligomenorrhoea, in which bleeding occurs at intervals of more than 35 days, with hypomenorrhoea menstruation is still present – just considerably lighter.

A gynaecological examination is the best way to reach an accurate diagnosis: it can establish whether this is a normal variation or a disorder requiring treatment.

How short or light does a period have to be to count as hypomenorrhoea? 

On average, a normal period lasts between 3 and 7 days, with a total blood loss of 30 to 80 ml. Hypomenorrhoea is diagnosed when bleeding lasts fewer than 3 days or when you lose considerably less blood – that is, under 30 ml or 20% less than in previous cycles.

If these changes persist over several consecutive cycles, it's advisable to have a gynaecological examination.

Can hypomenorrhoea affect fertility?

Yes. If hypomenorrhoea is associated with an absence of ovulation, low oestrogen levels or an overly thin womb lining, it can make it harder to become pregnant. Anovulatory cycles reduce the chances of conception, while a womb lining that is too thin can prevent the fertilised egg from implanting. In both cases, fertility may be affected.

Does hypomenorrhoea only occur at certain ages? 

Hypomenorrhoea can occur at any age, as long as you're having periods. It is, however, more common during puberty, when hormone levels fluctuate and the cycle is still settling, and during the perimenopause, when oestrogen levels gradually decline. If it occurs at other stages of life with no identifiable physiological cause such as pregnancy or breastfeeding, it's worth seeking medical advice.

Can stress or weight loss trigger hypomenorrhoea?

Yes. Chronic stress and sudden weight loss can affect the levels of the hormones responsible for menstruation and the menstrual cycle. When the body is under significant physical or emotional stress, it may reduce the production of oestrogen and progesterone, causing the womb lining to become thinner. These changes can result in shorter, lighter periods.

What tests are needed to diagnose hypomenorrhoea?

After reviewing your medical history and carrying out a gynaecological examination, your doctor may recommend further blood tests to measure hormone levels, a transvaginal ultrasound or a hysteroscopy. These additional investigations serve to confirm the diagnosis, identify the precise cause and determine the appropriate treatment.

Can hypomenorrhoea return to normal on its own? 

If it is caused by temporary factors such as stress, weight changes or taking hormonal contraceptives, your periods may regulate themselves once hormone levels return to the normal range. If hypomenorrhoea persists for several months or is accompanied by other symptoms, it's advisable to seek medical advice for diagnosis and treatment.

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