Early menopause happens when a woman's periods stop before the age of 45. It can happen naturally, or as a side effect of some treatments.
For most women, the menopause starts between the ages of 45 and 55.
If you're under 45 and have noticed your periods becoming infrequent or stopping altogether, you should speak to your GP.
Early menopause can happen naturally if a woman's ovaries stop making normal levels of certain hormones, particularly the hormone oestrogen.
This is sometimes called premature ovarian failure, or primary ovarian insufficiency.
The cause of premature ovarian failure is often unknown, but in some women it may be caused by:
Premature ovarian failure can sometimes run in families. This might be the case if any of your relatives went through the menopause at a very young age (20s or early 30s).
Your risk of having an early menopause will depend on:
Surgically removing both ovaries will also bring on premature or early menopause.
For example, the ovaries may need to be removed during a hysterectomy (an operation to remove the womb).
The main symptom of early menopause is periods becoming infrequent or stopping altogether without any other reason (such as pregnancy).
Some women may also get other typical menopausal symptoms, including:
Read more about the symptoms of the menopause.
Your GP should be able to make a diagnosis of early menopause based on your symptoms, your family history, and blood tests to check your hormone levels.
You may be referred to a specialist.
Your GP will probably recommend that you take this treatment long term, beyond the "normal" age of natural menopause (around 52 on average), to give you lasting protection.
If you have had certain types of cancer, such as certain types of breast cancer, you may not be able to have hormonal treatment.
Your GP will talk to you about other treatment options and lifestyle changes you can make to help protect your health.
If you're still getting symptoms, your GP can refer you to a specialist menopause centre.
Read more about treating the symptoms of the menopause.
Going through the menopause early can be very difficult and upsetting.
Permanent early menopause will affect your ability to have children naturally. This can be very distressing to women of all ages.
You may still be able to have children by using IVF and donated eggs from another woman, or using your own eggs if you had some stored. Surrogacy and adoption may also be options for you.
Counselling and support groups may be helpful.
Here are some you may want to try: