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Published: 29/06/2018

This information is for you if you wish to know more about endometriosis. It may also be helpful if you are the partner, relative or friend of someone with endometriosis.

The information here aims to help you better understand your health and your options for treatment and care. Your healthcare team is there to support you in making decisions that are right for you. They can help by discussing your situation with you and answering your questions.

This information covers:

  • What endometriosis is and how common it is
  • Where it can be found
  • Symptoms and diagnosis
  • Treatment options available
  • Other options for improving quality of life when living with the condition
  • Further information and support available

See a full glossary of all medical terms.

Key points

  • Endometriosis occurs when tissue similar to the inner lining of the womb (endometrium) is found elsewhere, usually in the pelvis around the womb ovaries and fallopian tubes.
  • Endometriosis can sometimes be a difficult condition to diagnose. It is a chronic condition that can affect your physical, sexual, psychological and social wellbeing
  • Common symptoms include pelvic pain and painful, sometimes irregular or heavy periods. It can cause pain during or after sex and can lead to fertility problems.
  • Treatment options include pain-relieving medications, hormones and/or surgery.

What is endometriosis?

Endometriosis is a condition where tissue similar to the inner lining of the womb (endometrium) is found elsewhere, usually in the pelvis around the womb ovaries and fallopian tubes It is a very common condition, affecting around 1 in 10 women. You are more likely to develop endometriosis if your mother or sister has had it.

Endometriosis usually affects women during their reproductive years. It can be a long-term condition that can have a significant impact on your general physical health, emotional wellbeing and daily routine.


What are the symptoms?

Common symptoms include pelvic pain and painful, sometimes irregular or heavy periods. It can cause pain during or after sex and can lead to fertility problems. You may also have pain related to your bowels, bladder, lower back or the tops of your legs, and experience long-term fatigue. Some women with endometriosis do not have any symptoms.

Endometriosis can cause pain that occurs in a regular pattern, becoming worse before and during your period. Some women experience pain all the time but for others it may come and go. The pain may get better during pregnancy and sometimes it may disappear without any treatment. For more information, see the RCOG patient information Chronic (long-term) pelvic pain.


What causes endometriosis?

The exact cause of endometriosis is not known but it is hormone dependent. This means that, just like the endometrium which responds to hormonal changes resulting in a period, the endometrial-like tissue located outside the womb also bleeds. This bleeding can cause pain, inflammation and scarring, and can possibly damage your pelvic organs.

Endometriosis may be found:

  • on the ovaries, where it can form cysts (often referred to as endometriomas or ‘chocolate cysts’)
  • in the peritoneum (the lining of the pelvis and abdomen)
  • in or on the fallopian tubes
  • on, behind or around the womb
  • in the area between the vagina and the rectum.

Endometriosis can also occur within the muscle wall of the womb (adenomyosis) and occasionally on the bowel and/or bladder. It may sometimes be found in other parts of the body, but this is rare.


How is it diagnosed?

Endometriosis can be a difficult condition to diagnose. This is because:

  • the symptoms of endometriosis vary so much
  • the symptoms are common and can be similar to pain caused by other conditions such as irritable bowel syndrome (IBS) or pelvic inflammatory disease (PID); for further information, see the RCOG patient information Acute pelvic inflammatory disease: tests and treatment
  • different women have different symptoms
  • some women have no symptoms.

See the section below on what tests may be offered to help diagnose endometriosis.

What will happen if I see a healthcare professional?

You should be asked:

  • about any pain you have and whether it has a pattern or is related to anything, in particular your periods
  • about your periods – are they painful and how heavy are they?
  • whether you have any pain or discomfort during sex
  • about problems with your bowels or urinary symptoms at the time of your period
  • about any difficulty you may have experienced getting pregnant if you have one or more of the above symptoms.

Your GP may carry out an internal examination with your consent. This helps to localise the pelvic pain and the doctor can feel for any lumps or tender areas. You will be offered a chaperone during this examination. You will be able to discuss any concerns and you will have an opportunity to ask other questions.

Your GP may offer further tests, for example an ultrasound scan, and start treatment to help your symptoms. If your symptoms do not improve with the treatment offered or if you are unable to tolerate the treatment, your GP will refer you to a gynaecologist for further tests and treatment.

What tests might I be offered?

Tests usually include a pelvic ultrasound scan. This may be a transvaginal scan to check the uterus and ovaries. It may show whether there is an endometriotic (also known as a ‘chocolate’) cyst in the ovaries or may suggest endometriosis between the vagina and rectum.

You may be offered a laparoscopy, which is the only way to get a definite diagnosis. This is carried out under a general anaesthetic. Small cuts are made in your abdomen and a telescope is inserted to look at your pelvis. You may have a biopsy to confirm the diagnosis and images may be taken for your medical records.

Your healthcare professional may suggest treating the endometriosis at the time of your first laparoscopy, either by removing cysts on the ovaries or treating any areas on the lining of your pelvis. This may avoid a second operation. Sometimes, however, the extent of endometriosis found means that you may need further tests or treatment.

The procedure, including any risks and the benefits, will be discussed with you. After your operation you be will told the results. You can often go home the same day after a laparoscopy. For information about recovery following a laparoscopy, please see the RCOG patient information Laparoscopy.

An MRI scan may be suggested if the condition appears to be advanced.


What are my options for treatment?

The options for treatment include those listed below.

Pain-relieving medication

There are several different medications to help relieve your pain. These can range from over-the-counter remedies to prescribed medications from your healthcare professional. In more severe situations, you may be referred to a specialist pain management team.

Hormone treatments

These treatments reduce or stop ovulation (the release of an egg from the ovary) and therefore allow the endometriosis to shrink by decreasing hormonal stimulation.

Some hormone treatments that may be offered are contraceptive and will also stop you becoming pregnant. They include:

  • the combined oral contraceptive (COC) pill or patch given continuously without the normal pill- free break; this usually stops ovulation and temporarily either stops your periods or makes your periods lighter and less painful
  • an intrauterine system (IUS/Mirena), which helps to reduce the pain and makes periods lighter; some women using an IUS get no periods at all
  • progestogens in the form of injection, the mini pill or the contraceptive implant.

Other hormonal treatments are available but these are not contraceptives. Therefore, if you do not want to become pregnant, you will need to use a contraceptive as well. Non-contraceptive hormone treatments include:

  • progestogens in the form of tablets
  • GnRHa (gonadotrophin-releasing hormone agonists)which are given as injections, implants or a nasal spray. They are very effective but can cause menopausal symptoms such as hot flushes and are also known to reduce bone density. To help reduce these side-effects and bone loss, you may be offered ‘add-back’ therapy in the form of hormone replacement therapy (HRT).


Surgery can treat or remove areas of endometriosis. The surgery recommended will depend on where the endometriosis is and how extensive it is. This may be done when the diagnosis is made or may be offered later. Success rates vary and you may need further surgery. Your gynaecologist will discuss the options with you fully.

Possible operations include:

  • laparoscopic surgery – when patches of endometriosis are destroyed or removed
  • laparotomy – for more severe cases. This is a major operation that requires a cut in the abdomen so that areas affected with endometriosis can be removed to provide symptom relief. This may involve removing large endometriotic cysts from your ovaries or even removal of your ovaries with or without performing a hysterectomy (removing the womb). You will not be able to have children after a hysterectomy. Longer term pain relief is more likely if your ovaries are removed. However, because of the health risks associated with removal of ovaries, your healthcare professional will discuss this and the possible need for hormone replacement therapy (HRT) with you

Sometimes other surgeons, such as bowel specialists, will be involved in your surgery. If you have severe endometriosis, you will be referred to an endometriosis specialist centre where a specialist team that could include a gynaecologist, a bowel surgeon, a radiologist and specialists in pain management will discuss your treatment options with you.

Fertility treatment

Getting pregnant can be a problem for some women with endometriosis. Hormonal treatment is not advisable when you are trying to conceive and surgical treatment may be more appropriate. Your healthcare professional should provide you with information about your options and arrange timely referral to a fertility specialist if appropriate.

Other options

Some women have found the following measures helpful:

  • exercise, which may improve your wellbeing and may help to improve some symptoms of endometriosis
  • cutting out certain foods such as dairy or wheat products from the diet
  • psychological therapies and counselling.

Complementary therapies

Although there is only limited evidence for their effectiveness, some women may find the following therapies help to reduce pain and improve their quality of life:

  • reflexology
  • transcutaneous electrical nerve stimulation (TENS)
  • acupuncture
  • vitamin B1 and magnesium supplements
  • traditional Chinese medicine
  • herbal treatments
  • homeopathy.


Further information

National Institute for Health and Care Excellence (NICE)Endometriosis: Diagnosis and Management

NHS Choices:

Endometriosis UK:

Fertility Network UK:

British Society for Gynaecological Endoscopy:

British Society for Gynaecological Endoscopy Accredited Centres:

RCOG Recovering Well series:


Abdominal hysterectomy

Laparoscopic hysterectomy

Shared Decision Making

If you are asked to make a choice, you may have lots of questions that you want to ask. You may also want to talk over your options with your family or friends. It can help to write a list of the questions you want answered and take it to your appointment.

Ask 3 Questions

To begin with, try to make sure you get the answers to 3 key questions, if you are asked to make a choice about your healthcare:

  1. What are my options?
  2. What are the pros and cons of each option for me?
  3. How do I get support to help me make a decision that is right for me?

*Ask 3 Questions is based on Shepherd et al. Three questions that patients can ask to improve the quality of information physicians give about treatment options: A cross-over trial. Patient Education and Counselling, 2011;84:379-85

Sources and acknowledgements

This information has been developed by the RCOG Patient Information Committee. It is based on the NICE clinical guideline Endometriosis: Diagnosis and Management, which you can find online at: The guideline contains a full list of the sources of evidence used. It is also based on the European Society of Human Reproduction and Embryology (ESHRE) clinical guideline Management of Women with Endometriosis, which you can find online at:.

This leaflet was reviewed before publication by women attending clinics in Edinburgh, Aberdeen, London, Chester, Stockport and Wrexham, by the RCOG Women’s Network and by the RCOG Women’s Voices Involvement Panel.

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