Complete Guide to Endometriosis

What endometriosis is, and what the names mean

The endometrium is the lining inside the uterus. Endometriosis involves similar tissue outside that location. Inflammation, scarring and adhesions can accompany it. The condition is not simply a heavy period, and the tissue does not have to form a large lump to be relevant.

The cause is not fully understood, and there is no established way to prevent the condition. Superficial disease affects the pelvic lining. An endometrioma is an ovarian cyst associated with endometriosis. Deep disease extends into tissues and may affect structures such as bowel, bladder or the ureters, which carry urine from the kidneys. These descriptions help a specialist decide what needs assessment and which skills may be required.

Adenomyosis is different: tissue similar to the womb lining is found within the muscular wall of the uterus. The conditions can coexist, but the names should not be treated as interchangeable. Ask which diagnosis is supported, which is suspected and what each would change in your care.

Recognising a symptom pattern without diagnosing yourself

Symptoms can include disruptive period pain, pelvic pain outside periods, pain during or after sex, pain with bowel movements or urination, and fatigue. Some people first encounter the condition during a fertility assessment; others have symptoms long before considering pregnancy. Severity and day-to-day impact deserve attention even when the cause is not yet established.

Record the pattern in language that is useful to you: where it happens, what brings it on, whether it follows your cycle, and what activities it prevents. Include what improves it and any medicine side effects. Bowel or bladder symptoms should not automatically be assigned to endometriosis because another condition may need assessment.

You do not need to complete an elaborate diary before seeking advice. A short description of missed work, disturbed sleep or pain with sex can give a clinician a clear starting point. Normalising the conversation should not mean normalising disabling pain.

How endometriosis can intersect with the Fertility Dance

Conception involves several steps: an egg develops and is released, sperm reach it, fertilisation occurs, and an embryo develops and reaches the uterus. Endometriosis can intersect with this pathway through pelvic inflammation, adhesions or altered anatomy. Ovarian disease and ovarian surgery also raise questions about reserve and treatment planning.

These are possible mechanisms, not proof of what is preventing a particular pregnancy. Pain can also make intercourse difficult, while fatigue, treatment and emotional strain can affect practical attempts. An assessment should recognise those experiences without reducing the person to a collection of test results.

Not everyone with endometriosis has difficulty conceiving. When conception is unresolved, ovulation, tubes, sperm and the planned family-building route still matter. A known diagnosis should help focus the investigation, not make every other relevant question disappear.

• Understand what semen analysis contributes to the wider picture

Diagnosis is a sequence of questions, not one universal test

Assessment can bring together symptoms, medical and family history, examination, imaging and, for selected situations, laparoscopy. The next step should address a defined question: identify another explanation, assess suspected disease, map its extent or plan treatment. The order depends on the person rather than a requirement to complete every test.

NICE and ESHRE recognise that imaging and clinical assessment have important roles and that laparoscopy may still be considered when appropriate. Surgery is not necessarily required before beginning symptom care. Conversely, a negative scan should not automatically end an assessment when symptoms remain significant.

Ask for a plan in both directions: what follows if the investigation finds something, and what follows if it does not? That prevents another reassuring result becoming an administrative endpoint with no answer to the original concern.

Understanding a normal ultrasound or MRI

A scan can be accurate and useful without excluding every form of a condition. Small superficial deposits may not be visible, while endometriomas and deep disease are different imaging targets. The report should be interpreted alongside what was examined and the symptoms that prompted it.

Preserve the reassurance the result actually provides. Ask whether your ongoing question requires symptom treatment, specialist assessment, different imaging or another approach. A normal scan is not evidence that pain is imaginary, but it is not proof that endometriosis must be present either.

• Read the focused blog: can a normal ultrasound rule out endometriosis?

What blood tests and AMH do not establish

A routine fertility hormone panel does not diagnose endometriosis. A result within range does not exclude it, and an abnormal hormone value needs its own interpretation. NICE specifically advises against using CA125 to diagnose endometriosis. Do not treat a biomarker mentioned online as a substitute for a validated clinical pathway.

AMH and antral follicle count can be relevant to estimating response to ovarian stimulation. They do not directly measure egg quality, diagnose every cause of pain or predict an individual's natural pregnancy outcome. If ovarian surgery or fertility preservation is being considered, ask how reserve information would affect the decision rather than testing simply because the condition has been named.

• Complete Guide to AMH
• Match fertility blood tests to the question they can answer

Stage, location, pain and fertility are different descriptions

You may hear a stage or classification after an operation. It describes aspects of disease that were observed; it is not a personal score for pain, resilience or the chance of having a baby. Location, symptoms, ovarian involvement, previous treatment and other fertility factors can lead to different decisions for people given a similar label.

Instead of asking only whether the disease is ‘mild’ or ‘severe’, ask what was found, which structures are involved and what matters for your goal. Keep a copy of the operation report and any photographs or histology report offered. Those details can be more useful to a future treating team than the stage alone.

Pain, sex and daily functioning are treatment goals too

Endometriosis care is not justified only by a wish for pregnancy. Pain relief, comfortable movement, sexual wellbeing, sleep, bowel or bladder function and participation in work or education are valid outcomes. State the activities you want to regain so a review can assess something more meaningful than whether a prescription was issued.

Pain during sex deserves discussion without embarrassment or pressure to continue through it. Tell the clinician whether it is superficial, deep, during or afterwards. Where appropriate, care may include sexual-health assessment, pelvic-floor support or psychological support alongside medical treatment. Support for coping does not imply that the underlying symptoms are invented.

Hormone treatment: distinguish pain control from conception

Hormonal medicines are among the options for managing symptoms. Suitability depends on health history, preferences, side effects and whether pregnancy is currently desired. A treatment that helps pain can still be unsuitable for attempts at conception during its use.

Do not interpret suppression of ovulation as a fertility-enhancement treatment by itself. Discuss the reason for the medicine, how long it is intended for, what response is expected and how it fits with later plans. Changes to a prescribed treatment belong with the responsible clinician rather than a decision made from a symptom chart alone.

Surgery: define the purpose before weighing the trade-offs

Surgery may aim to treat pain, address particular disease or improve the possibility of spontaneous conception in selected circumstances. These aims need separate discussion. An operation recommended for one purpose is not automatically necessary for every other purpose.

NICE's fertility-priority recommendations describe options according to the type of endometriosis and the structures involved. Deep disease may need a specialist team. Ask about the proposed procedure, likely benefits for your particular goal, complications, recovery, recurrence and alternatives, including what happens if you do not have surgery now.

A useful consent conversation also covers the extent of treatment that may occur during a diagnostic procedure. Clarify who will operate and whether additional decisions would require another appointment or specialist input. You should know what has been agreed, not discover the scope only afterwards.

Endometriomas and protecting ovarian options

An ovarian endometrioma creates a particular planning question because both the disease and treatment involving the ovary can be relevant to ovarian reserve. Decisions should consider symptoms, previous ovarian surgery, whether one or both ovaries are involved, age, existing reserve information and reproductive plans.

ESHRE does not recommend routine endometrioma surgery before assisted reproduction solely to improve live-birth outcomes; benefit has not been established and reserve may be adversely affected. Surgery can still be considered for other reasons, including pain or access to follicles. These are not contradictory positions: the indication matters.

Ask the surgeon and fertility team to connect their recommendations before an elective procedure when possible. That does not mean needed care should be delayed; it means the plan should account for the implications of each step rather than treating the ovary and future options as separate subjects.

Trying to conceive, IUI and IVF: choose a route, not a fixed ladder

Current NICE fertility guidance, published in March 2026, has a dedicated endometriosis pathway. It brings together duration of trying, symptoms and disease severity, age, ovarian reserve and male fertility factors. Those considerations help decide whether an agreed period of trying, surgery or fertility treatment fits the situation.

IUI with stimulation or IVF may be discussed where appropriate; neither should be chosen from the diagnosis alone. Ask what each option is intended to overcome, what monitoring is involved and why the proposed timing is suitable for you. NHS funding criteria and your clinical or personal reasons for seeking advice are different questions.

You do not need to postpone an assessment simply to reach a time threshold when there is a known condition or concern. If trying for pregnancy is not your present goal, an education or symptom-care plan may be the appropriate endpoint instead. Necessary specialist treatment should not be delayed for a generic optimisation programme.

When to discuss fertility preservation

Fertility preservation can be a relevant conversation for some people with substantial ovarian disease or proposed ovarian treatment. ESHRE recommends discussing advantages and disadvantages in extensive ovarian endometriosis, while making clear that the true benefit remains uncertain. This is not a recommendation that everyone with endometriosis should freeze eggs.

Ask what preservation could realistically offer in your situation, how many treatment stages and costs are involved, and whether timing before surgery is relevant. Eggs stored, eggs later surviving thawing and a future live birth are different outcomes. A discussion can help preserve choice without creating pressure to buy a procedure.

• Understand egg and embryo freezing decisions

Planning ahead, solo parenthood and LGBTQ+ family building

Make the intended route explicit. Someone planning donor-sperm insemination, someone providing eggs in reciprocal IVF and someone considering pregnancy years ahead do not all need the same conversation now. Assessment should follow the relevant anatomy, role and decision, not an assumption about a heterosexual couple.

For a trans or non-binary person, discuss examination preferences, the language you want used and the interaction with current treatment or future reproductive plans. Endometriosis care should remain available whether or not pregnancy is desired. A partner can be included if you want, but you do not need one to ask for information or support.

• Different roles in reciprocal IVF
• Planning solo parenthood in the UK

Everyday support without promises to cure the disease

Food, movement, rest, support and management of other health conditions can be part of living well. They should not be sold as a guaranteed way to remove endometriosis or achieve pregnancy. Avoid treating a restrictive diet or a long supplement list as a test of how committed you are to getting better.

If fatigue, eating difficulties, pain or treatment side effects are affecting daily life, ask for relevant support. A dietitian, pain team or emotional-support practitioner may have a specific role alongside medical care. Name the intended benefit and review whether it helps; do not replace indicated specialist assessment with a general wellbeing package.

A practical appointment and decision checklist

Bring what you have: a symptom summary, medicine list, scan reports, previous operation details and relevant fertility results. Mark what you want to decide today. ‘I want to understand the pain’, ‘I want to prepare for pregnancy’ and ‘I need to weigh ovarian surgery’ are different starting points.

Ask the team to identify the owner of each next action and the review point. If more than one service is involved, clarify who brings the findings together. You do not need every result in advance, and missing paperwork should not stop you asking for help.

How to turn information into a useful next step

A connected plan states what is known, what remains uncertain and what action follows. Reviews should assess symptoms, functioning or the agreed fertility decision, not simply count how many investigations have been completed. Ask what would prompt an earlier review or a different specialist route.

ProFertility can help connect your history, relevant fertility questions and specialist consultation options. A standalone consultation or education may be sufficient. Where broader coordinated support is appropriate, the ProFertility Plan brings assessment, targeted investigation, clinical review and agreed actions together; it cannot promise to cure endometriosis or prevent the need for fertility treatment.

Imaging, surgery and prescribed treatment must remain with appropriately qualified clinical teams. The aim is to make the handovers and decisions clearer, not to presume that a previous clinician missed a cause or that more tests will necessarily uncover one.

When not to assume symptoms are an endometriosis flare

New or acutely worsening pelvic pain needs attention on its own merits, even if you already have endometriosis. NHS advice is to seek emergency care for pelvic pain that is severe or worsening, or occurs with fainting, shoulder-tip pain, difficulty breathing or heavy vaginal bleeding. Call 999 or go to A&E; do not drive yourself if unwell.

Pelvic pain with a possible pregnancy also needs urgent advice. Contact NHS 111 or the appropriate pregnancy service rather than wait for a routine fertility appointment. A familiar diagnosis should not be used to explain away a new emergency.

Related guidance and support

• Complete Guide to Female Fertility
• AMH, ovarian reserve and treatment planning
• HyCoSy and HSG: understand the tubal-testing question
• Include the sperm side of the fertility assessment
• Explore free HerStory learning and community

Related blog articles

• Can a normal ultrasound rule out endometriosis?

Frequently asked questions