Overview - Ovarian cyst

An ovarian cyst is a fluid-filled sac that develops on an ovary. They're very common and do not usually cause any symptoms.

Most ovarian cysts occur naturally and go away in a few months without needing any treatment.

The ovaries

The ovaries are 2 almond-shaped organs that are part of the female reproductive system. There's 1 on each side of the womb (uterus).

The ovaries have 2 main functions:

to release an egg approximately every 28 days as part of the menstrual cycle
to release the sex hormones oestrogen and progesterone, which play an important role in reproduction

Ovarian cysts may affect both ovaries at the same time, or they may only affect 1.

Symptoms of an ovarian cyst

An ovarian cyst usually only causes symptoms if it splits (ruptures), is very large or blocks the blood supply to the ovaries.

In these cases, you may have:

pelvic pain – this can range from a dull, heavy sensation to a sudden, severe and sharp pain
pain during sex
difficulty emptying your bowels
a frequent need to urinate
heavy periods, irregular periods or lighter periods than normal
bloating and a swollen tummy
feeling very full after only eating a little
difficulty getting pregnant – although fertility is usually unaffected by ovarian cysts

See a GP if you have symptoms of an ovarian cyst.

If you have sudden, severe pelvic pain you should immediately contact either:

Types of ovarian cyst

The 2 main types of ovarian cyst are:

functional ovarian cysts – cysts that develop as part of the menstrual cycle and are usually harmless and short-lived; these are the most common type
pathological ovarian cysts – cysts that form as a result of abnormal cell growth; these are much less common

Ovarian cysts can sometimes also be caused by an underlying condition, such as endometriosis.

The vast majority of ovarian cysts are non-cancerous (benign), although a small number are cancerous (malignant).

Cancerous cysts are more common if you have been through the menopause.

Find out more about the causes of ovarian cysts

Diagnosing ovarian cysts

If a GP thinks you may have an ovarian cyst, you'll probably be referred for an ultrasound scan, carried out by using a probe placed inside your vagina.

If a cyst is identified during the ultrasound scan, you may need to have this monitored with a repeat ultrasound scan in a few weeks, or a GP may refer you to a doctor who specialises in female reproductive health (gynaecologist).

If there's any concern that your cyst could be cancerous, the doctor will also arrange blood tests to look for high levels of chemicals that can indicate ovarian cancer.

But having high levels of these chemicals does not necessarily mean you have cancer, as high levels can also be caused by non-cancerous conditions, such as:

Treating ovarian cysts

Whether an ovarian cyst needs to be treated will depend on:

its size and appearance
whether you have any symptoms
whether you have been through the menopause

In most cases, the cyst often disappears after a few months. A follow-up ultrasound scan may be used to confirm this.

If you are postmenopausal, there is a slightly higher risk of ovarian cancer. Regular ultrasound scans and blood tests are usually recommended over the course of a year to monitor the cyst.

Surgical treatment to remove the cysts may be needed if they're large, causing symptoms or potentially cancerous.

Ovarian cysts and fertility

Ovarian cysts do not usually prevent you getting pregnant, although they can sometimes make it harder to conceive.

If you need an operation to remove your cysts, your surgeon will aim to preserve your fertility whenever possible.

This may mean removing just the cyst and leaving the ovaries intact, or only removing 1 ovary.

In some cases, surgery to remove both your ovaries may be necessary, in which case you'll no longer produce any eggs.

Make sure you talk to your surgeon about the potential effects on your fertility before your operation.

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Media last reviewed: 14 April 2018
Media review due: 14 April 2021

Page last reviewed: 10 December 2019
Next review due: 10 December 2022

Causes - Ovarian cyst

Ovarian cysts often develop naturally if you have monthly periods.

They can also affect people who have been through the menopause.

Types of ovarian cyst

There are many different types of ovarian cyst, which can be categorised as either:

functional cysts
pathological cysts

Functional cysts

Functional ovarian cysts are linked to the menstrual cycle. They happen if you have not been through the menopause, and they are very common.

Each month, ovaries release an egg, which travels down the fallopian tubes where it can be fertilised by sperm.

Each egg forms inside the ovary in a structure known as a follicle. The follicle contains fluid that protects the egg as it grows, and it bursts when the egg is released.

But sometimes a follicle does not release an egg, or does not discharge its fluid and shrink after the egg is released. If this happens, the follicle can swell and become a cyst.

Functional cysts are non-cancerous (benign) and are usually harmless, although they can sometimes cause symptoms such as pelvic pain.

Most will disappear in a few months without needing any treatment.

Pathological cysts

Pathological cysts are caused by abnormal cell growth and are not related to the menstrual cycle. They can develop before and after the menopause.

Pathological cysts develop from either the cells used to create eggs or the cells that cover the outer part of the ovary.

They can sometimes burst or grow very large and block the blood supply to the ovaries.

Pathological cysts are usually non-cancerous, but a small number are cancerous (malignant) and often surgically removed.

Conditions that cause ovarian cysts

In some cases, ovarian cysts are caused by an underlying condition, such as endometriosis.

Endometriosis occurs when pieces of the tissue that line the womb (endometrium) are found outside the womb in the fallopian tubes, ovaries, bladder, bowel, vagina or rectum. Blood-filled cysts can sometimes form in this tissue.

Polycystic ovary syndrome (PCOS) is a condition that causes lots of small, harmless cysts to develop on your ovaries.

The cysts are small egg follicles that do not grow to ovulation and are caused by altered hormone levels.

Page last reviewed: 10 December 2019
Next review due: 10 December 2022

Treatment - Ovarian cyst

In most cases, ovarian cysts disappear in a few months without the need for treatment.

Whether treatment is needed will depend on:

its size and appearance
whether you have any symptoms
whether you've had the menopause – if you are postmenopausal there is a slightly higher risk of ovarian cancer

Watchful waiting

In most cases, a policy of "watchful waiting" is recommended.

This means you will not receive immediate treatment, but you may have an ultrasound scan a few weeks or months later to check if the cyst has gone.

If you have been through the menopause you may be advised to have ultrasound scans and blood tests every 4 months for a year, as you will have a slightly higher risk of ovarian cancer.

If the scans show that the cyst has disappeared, further tests and treatment are not usually necessary. Surgery may be recommended if the cyst is still there.

Surgery

Large or persistent ovarian cysts, or cysts that are causing symptoms, usually need to be surgically removed.

Surgery is also normally recommended if there are concerns that the cyst could be cancerous or could become cancerous.

There are 2 types of surgery used to remove ovarian cysts:

a laparoscopy
a laparotomy

These are usually carried out under general anaesthetic.

Laparoscopy

Most cysts can be removed using laparoscopy. This is a type of keyhole surgery where small cuts are made in your tummy and gas is blown into the pelvis to allow the surgeon to access your ovaries.

A laparoscope (a small, tube-shaped microscope with a light on the end) is passed into your abdomen so the surgeon can see your internal organs. The surgeon then removes the cyst through the small cuts in your skin.

After the cyst has been removed, the cuts will be closed using dissolvable stitches.

A laparoscopy is preferred because it causes less pain and has a quicker recovery time. Most people are able to go home on the same day or the following day.

Laparotomy

If your cyst is particularly large, or there's a chance it could be cancerous, a laparotomy may be recommended.

During a laparotomy, a single, larger cut is made in your tummy to give the surgeon better access to the cyst.

The whole cyst and ovary may be removed and sent to a laboratory to check whether it's cancerous. Stitches or staples will be used to close the incision.

You may need to stay in hospital for a few days after the procedure.

After surgery

The time it takes to recover from surgery is different for everyone. After the ovarian cyst has been removed, you'll feel pain in your tummy, although this should improve in a few days.

After a laparoscopy or a laparotomy, it may take as long as 12 weeks before you can resume normal activities.

If the cyst is sent off for testing, the results should come back in a few weeks and your consultant will discuss with you whether you need any further treatment.

Contact a GP if you notice the following symptoms during your recovery:

heavy bleeding
severe pain or swelling in your abdomen
a high temperature (fever)
dark or smelly vaginal discharge

These symptoms may indicate an infection.

Your fertility

If you have not been through the menopause, your surgeon will try to preserve as much of your reproductive system as they can. It's often possible to just remove the cyst and leave both ovaries intact, which means your fertility should be unaffected.

If 1 of your ovaries needs to be removed, the remaining ovary will still release hormones and eggs as usual. Your fertility should not be affected, although you may find it slightly harder to get pregnant.

Occasionally, it may be necessary to remove both ovaries, even if you have not been through the menopause. This triggers an early menopause and means you no longer produce any eggs.

However, it may still be possible to have a baby by having a donated egg implanted into your womb. This will need to be discussed with specialists at a centre that specialises in assisted reproduction techniques.

If you have been through the menopause, both ovaries may be removed because they no longer produce eggs.

Make sure you discuss your fertility concerns with your surgeon before your operation.

Cancer treatment

If your test results show that your cyst is cancerous, both of your ovaries, your womb (uterus) and some of the surrounding tissue may need to be removed.

This would trigger an early menopause and mean that you're no longer be able to get pregnant.

Treating conditions that cause ovarian cysts

If you have been diagnosed with a condition that can cause ovarian cysts, such as endometriosis or polycystic ovary syndrome (PCOS), your treatment may be different.

For example, endometriosis may be treated with painkillers, hormone medication, and/or surgery to remove or destroy areas of endometriosis tissue.

Read more about treating endometriosis and treating PCOS.

Page last reviewed: 10 December 2019
Next review due: 10 December 2022