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Periods which stop (amenorrhoea)

uterusPregnancy is the most common reason for periods to stop. However, it is not uncommon to miss the odd period for no apparent reason. But, it is unusual to miss several periods unless you are pregnant. Apart from pregnancy, other causes of periods stopping include stress, losing weight, exercising too much (long distance runners etc), and hormone problems. As a rule, it is best to see a doctor if your periods stop for several months without explanation.

Also, see a doctor if your periods have not started at all by the age of 16.

Irregular periods

The interval between periods can vary in some women. Irregular periods may indicate that you do not ovulate every month, and the balance of the female hormones may be upset. See a doctor if your periods become irregular in your younger years. However, irregular periods are common in the few years leading up to the menopause.

The most common cause of lack of periods in women of childbearing age, other than being pregnant is Polycystic Ovarian Syndrome (PCOS)

Polycystic ovary syndrome (PCOS, is a condition where at least two of the following occur:
  • At least 12 follicles (tiny cysts) develop in your ovaries. (Polycystic means many cysts.)
  • The balance of hormones that you make in the ovaries is altered. In particular, your ovaries make more testosterone (male hormone) than normal. You may have acne, excessive hair in unwanted places and thinning or loss of hair on your head.
  • You do not ovulate each month. Thus if you do not ovulate then you do not have a period.
Therefore, it is possible to have polycystic ovaries without the typical symptoms that are in the syndrome. It is also possible to have PCOS without multiple cysts in the ovary. You are not to be unduly concerned if such cysts are found on ultrasound unless you have one or both of the other features of the condition.

How common is polycystic ovary syndrome?

PCOS is common. Research studies of women who had an ultrasound scan of their ovaries found that up to 1 in 4 young women have polycystic ovaries (ovaries with many small cysts). However, many of these women were healthy, ovulate normally, and do not have high levels of male hormones. It is thought that up to 1 in 10 women have polycystic ovary syndrome (PCOS) - that is, at least two of: polycystic ovaries, a raised level of male hormone, lack of periods.

What causes polycystic ovary syndrome?

The exact cause is not totally clear. Several factors probably play a part. These include the following:


Insulin is a hormone that you make in your pancreas (a gland behind your stomach). The main role of insulin is to control your blood sugar level. Insulin acts mainly on fat and muscle cells causing them to take in sugar (glucose) when your blood sugar level rises. Another effect of insulin is to act on the ovaries to cause them to produce testosterone (male hormone).

Women with PCOS have what is called insulin resistance. This means that cells in the body are resistant to the effect of a normal level of insulin. More insulin is produced to keep the blood sugar normal. This raised level of insulin in the bloodstream is thought to be the main underlying reason why PCOS develops. It causes the ovaries to make too much testosterone. A high level of insulin and testosterone interfere with the normal development of eggs in the ovaries. As a result, many eggs tend to develop but often do not develop fully. This causes problems with ovulation: hence period problems and reduced fertility.

It is this increased testosterone level in the blood that causes excess hair growth on the body and thinning of the scalp hair. When performing blood tests your doctor should do both testosterone and a protein called Sex Hormone Binding Globulin. Increased insulin also contributes towards weight gain.

Hereditary factors
Your genetic makeup is probably important. One or more genes may make you more prone to developing PCOS. PCOS is not strictly inherited from parents to children, but it may run in some families.

Being overweight or obese is not the underlying cause of PCOS. However, if you are overweight or obese, excess fat can make insulin resistance worse. This may then cause the level of insulin to rise even further. High levels of insulin can contribute to further weight gain producing a 'vicious cycle'. Losing weight, although difficult, can help break this cycle.

What are the symptoms and problems of polycystic ovary syndrome?

Symptoms that occur if you do not ovulate
  • Period problems occur in about 7 in 10 women with PCOS. You may have irregular or light periods, or no periods at all.
  • Fertility problems - you need to ovulate to become pregnant. You may not ovulate each month, and some women with PCOS do not ovulate at all. PCOS is one of the most common causes of infertility.
Symptoms that can occur if you make too much testosterone (male hormone)
  • Excess hair growth occurs in more than half of women with PCOS. It is mainly on the face, lower abdomen, and chest. This is the only symptom in some cases.
  • Acne may persist beyond the normal teenage years.
  • Thinning of scalp hair (similar to male pattern baldness) occurs in some cases.
Other symptoms
  • Weight gain - about 4 in 10 women with PCOS become overweight or obese.
  • Depression or poor self-esteem may develop as a result of the other symptoms.

Symptoms typically begin in the late teens or early 20s. Not all symptoms occur in all women with PCOS. For example, some women with PCOS have some excess hair growth, but have normal periods and fertility.

Symptoms can vary from mild to severe. For example, mild unwanted hair is normal, and it can be difficult to say when it becomes abnormal in women with mild PCOS. At the other extreme, women with severe PCOS can have marked hair growth, infertility, and obesity. Symptoms may also change over the years. For example, acne may become less of a problem in middle age, but hair growth may become more noticeable.

Possible long-term problems of polycystic ovary syndrome

If you have PCOS, over time you have an increased risk of developing diabetes, diabetes in pregnancy, a high cholesterol level, and possibly high blood pressure. For example, about 1 in 10 women with PCOS develop diabetes at some point. These problems in turn may also increase your risk of having a stroke and heart disease in later life. These increased health risks are due to the long-term insulin resistance (and also being overweight which is common in women with PCOS).

If you have no periods, or very infrequent periods, you may have a higher than average risk of developing cancer of the uterus (womb). However, the evidence for this is not conclusive and, if there is a risk, it is probably small. A sleeping problem called sleep apnoea is also more common than average in women with PCOS.

If you are overweight and do manage to conceive you have an increased chance of miscarriage, diabetes, high blood pressure and early labour. In addition, your baby may need admission to the Special Care Unit

Are any tests needed?

Tests may be advised to clarify the diagnosis, and to rule out other hormone conditions.
  • Blood tests may be taken to measure certain hormones. For example, a test to measure testosterone and sex hormone binding globulin which tend to be high in women with PCOS.
  • An ultrasound scan of the ovaries may be advised. An ultrasound scan is a painless test that uses sound waves to create images of structures in the body. The scan can detect the typical appearance of PCOS with the many follicles (small cysts) in slightly enlarged ovaries.

What is the treatment for polycystic ovary syndrome?

Symptoms can be treated, and your health risks can be reduced.

You should aim to lose weight if you are overweight

Losing weight helps to reduce the high insulin level that occurs in PCOS. This has a knock-on effect of reducing testosterone. This then improves the chance of your ovulating, which improves any period problems, fertility, and may also help to reduce hair growth and acne.

Losing weight can be difficult. A combination of eating less and exercising more is best. Advice from a dietician, and help and support from a practice nurse, may increase your chance of losing weight. Even a moderate amount of weight loss can help.

Treating hair growth

Hair growth is due to the increased level of the hormone testosterone.
  • Unwanted hair can be removed by shaving, waxing, hair-removing creams, electrolysis, and laser treatments. These need repeating every now and then, although electrolysis and laser treatments may be more long-lasting (but are expensive, and are not available on the NHS).
  • A cream called eflornithine may be prescribed to rub on affected areas of skin. It works by counteracting an enzyme (chemical) involved in making hair in the skin.
  • Drugs taken by mouth can also treat hair growth. They work by reducing the amount of testosterone that you make, or by blocking its effect. Drugs include:
    • Cyproterone acetate is an anti-testosterone drug. This is commonly combined with oestrogen as a special contraceptive pill called Dianette®. Dianette® is commonly prescribed to regulate periods, to help reduce hair growth, to reduce acne, and is a good contraceptive.
    • Other anti-testosterone drugs are sometimes advised by a specialist if the above treatments do not help.

Drugs taken by mouth to treat hair growth take 3-9 months to work fully. You need then to carry on taking them otherwise hair growth will recur. Removing hair by the methods above (shaving, etc) may be advised whilst waiting for a drug to work.

Treating acne

The treatments used for acne in women with PCOS are no different to the usual treatments for acne. The combined contraceptive pills, especially Dianette® often help to improve acne.

Treating period problems

Some women who have no periods, or infrequent periods, do not want any treatment for this. However, your risk of developing cancer of the uterus (womb) may be increased if you have no periods for a long time. Regular periods will prevent this possible increased risk to the uterus.

Therefore, some women with PCOS are advised to take the contraceptive pill as it causes regular withdrawal bleeds similar to periods. If this is not suitable, another option is to take progestogen hormone for several days every month which will cause a monthly bleed like a period. Sometimes, an intrauterine system (IUS), which releases small amounts of progesterone into the womb preventing a build-up of the lining, can be used.

Fertility issues

Although fertility is often reduced, you still need contraception if you want to be sure of not getting pregnant. The chance of becoming pregnant depends on how often you ovulate. Some women with PCOS ovulate now and then, others not at all.

If you do not ovulate but want to become pregnant, then fertility treatments may be recommended by a specialist and have a good chance of success. But remember, you are much less likely to become pregnant if you are obese. If you are obese or overweight then losing weight is advised in addition to other fertility treatments.


Metformin is a drug that is commonly used to treat people with diabetes. It makes the body's cells more sensitive to insulin. This may result in a decrease in the blood level of insulin which may help to counteract the underlying cause of PCOS - see above.


This is reserved for women who have failed to respond to treatment and have a hormone profile to suggest it would be beneficial. The ovaries are treated by a procedure called Fine Needle Diathermy. Around 70% of women will have resolution of their symptoms if correctly selected.

Preventing long-term problems

A healthy lifestyle is important to help prevent the conditions listed above in 'Possible long-term problems of polycystic ovary syndrome'. For example, you should: eat a healthy diet, exercise regularly, lose weight if you are overweight or obese, and not smoke.

Further help and advice

Unit AS20.01, The Aberdeen Centre, 22-24 Highbury Grove, London N5 2EA
Web: www.verity-pcos.org.uk
Verity is a UK charity for women whose lives are affected by polycystic ovary syndrome.


What can you do for PCOS?

There are several things that an individual can do if they have a tendency towards developing some or all of the elements of PCOS. Much of this involves lifestyle changes to ensure that your weight is kept within normal limits (BMI between 19 and 25).

In addition, because there is a likelihood of developing diabetes in later life and a slightly higher risk of heart disease, low-fat and low-sugar options should be considered when making choices about what to eat or to drink.

Weight loss, or maintaining weight below a certain level, will have the short-term benefit of increasing the likelihood of successful treatment and the long-term benefits of reducing the risk of diabetes and heart disease.

Weight loss is effective in reducing male hormone levels, increasing the likelihood of ovulation and getting pregnant.

Using medications to lose weight may be effective, and orlistat is probably the most effective of these. Metformin on the other hand is probably not effective in helping to lose weight though evidence on this is conflicting.

It's interesting that despite all the research into PCOS, the exact relationship between the condition and weight gain (or loss) is unclear. But being overweight, and especially increased abdominal fat, seems to be a strong predictor of having other hormonal problems – such as raised male hormones and tendencies to having diabetes.

What can your doctor do?

Your family doctor will be able to provide many of the drug treatments available (although these are probably best taken in consultation with a specialist). Treatments aim to improve several aspects of PCOS, including:
  • fertility, via the stimulation of ovulation.
  • reduction of the insulin resistance.
  • reduction of the increased hair.

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