Endometriosis is a condition in which tissue similar to the lining of the uterus grows outside the uterus. It most commonly affects areas within the pelvis, including the ovaries, fallopian tubes, and tissues surrounding the uterus.

Endometriosis can affect fertility in different ways. Some patients with endometriosis conceive naturally without difficulty, while others may experience a longer time to pregnancy or need fertility treatment.

The impact of endometriosis on fertility varies from person to person. Factors such as age, ovarian reserve, the location and extent of endometriosis, fallopian-tube function, sperm health, and previous surgery may all influence the overall fertility picture.

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Why Endometriosis May Affect Fertility

Endometriosis may affect fertility through several possible mechanisms.

Pelvic Inflammation

Endometriosis is associated with inflammation within the pelvic environment. This may affect the tissues surrounding the ovaries, fallopian tubes, and uterus.

Inflammation does not automatically prevent pregnancy, but it may be one factor that influences reproductive function in some patients.

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Ovarian Function

When endometriosis involves the ovaries, it may form ovarian cysts known as endometriomas.

Depending on their size, location, and treatment history, endometriomas may be associated with changes in ovarian function or ovarian reserve.

Previous surgery involving the ovaries may also be relevant because removing an endometrioma can sometimes affect healthy ovarian tissue as well as the cyst itself.

Egg and Follicular Environment

Follicles develop within the ovaries over time before ovulation or egg retrieval.

Endometriosis may affect the ovarian environment in some patients, particularly when ovarian involvement or inflammation is present.

This does not mean that every patient with endometriosis has poor egg quality or difficulty producing healthy embryos.

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Fallopian-Tube Function

Pregnancy through natural conception requires the fallopian tubes to capture the ovulated egg and allow sperm and egg to meet.

Endometriosis may sometimes contribute to:

• Pelvic adhesions
• Changes in the position of reproductive organs
• Tubal scarring
• Reduced tubal mobility

These changes may make natural conception more difficult in some patients.

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Uterine and Endometrial Environment

Implantation occurs when a developing embryo attaches to and begins interacting with the uterine lining.

Endometriosis may be associated with changes in the pelvic and reproductive environment that can influence implantation in some patients.

However, implantation is complex, and endometriosis should not automatically be assumed to be the cause of every unsuccessful embryo transferor pregnancy loss.

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Common Signs, Findings, or Concerns

Endometriosis can cause significant symptoms, but some patients have very mild symptoms or no obvious symptoms at all.

Common concerns may include:

• Painful menstrual periods
• Pelvic pain before or during menstruation
• Pain during or after intercourse
• Pain with bowel movements during menstruation
• Pain with urination during menstruation
• Chronic pelvic pain
• Heavy menstrual bleeding
• Bloating
• Fatigue
• Difficulty becoming pregnant
• Ovarian endometriomas
• Pelvic adhesions
• Previous endometriosis surgery
• Repeated fertility treatment without success

The severity of pain does not always reflect the extent of endometriosis. A patient with significant endometriosis may have relatively mild symptoms, while another patient with less extensive disease may experience severe pain.

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How Endometriosis and Fertility Are Commonly Evaluated

Evaluation may include a review of both endometriosis symptoms and fertility factors.

Medical and Menstrual History

A healthcare provider may ask about:

• Menstrual-cycle patterns
• Pelvic pain
• Pain during intercourse
• Bowel or bladder symptoms
• Previous pregnancies
• Previous fertility treatment
• Previous pelvic surgery
• Previous endometriosis diagnosis or treatment
• How long pregnancy has been attempted

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Pelvic Ultrasound

Ultrasound may help identify ovarian endometriomas and other pelvic findings.

Ultrasound does not identify every form of endometriosis, so normal imaging does not always rule out the condition.

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Ovarian Reserve Testing

Patients planning pregnancy or fertility treatment may undergo testing such as:

• AMH
• Antral follicle count
• FSH
• Estradiol

These tests can provide information about ovarian reserve and expected response to fertility medication.

They do not directly measure egg quality or overall pregnancy potential.

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Fallopian-Tube Evaluation

When natural conception or IUI is being considered, evaluation of tubal patency may be appropriate.

Surgical Evaluation

Laparoscopy can directly identify and treat endometriosis, but surgery is not automatically necessary for every patient before attempting pregnancy or fertility treatment.

The decision depends on symptoms, imaging findings, ovarian reserve, previous surgery, age, fertility goals, and the overall treatment plan.

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Common Medical Treatment Options

Treatment depends on whether the main goal is pain management, pregnancy, fertility preservation, or a combination of these.

Trying to Conceive Naturally

Natural conception may remain a reasonable option for selected patients depending on:

• Age
• Ovarian reserve
• Tubal function
• Severity of endometriosis
• Duration of infertility
• Sperm health

Patients should discuss how long to continue trying naturally with their fertility specialist when time is an important factor.

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Ovulation Induction and IUI

IUI may be considered in selected patients when at least one fallopian tube is open and other fertility factors are favorable.

Medication may also be used to support follicular development or improve the timing of ovulation.

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IVF

IVF may be considered when:

• Fallopian-tube function is impaired
• Ovarian reserve is reduced
• Endometriosis is more advanced
• Other infertility factors are present
• Previous treatment has not resulted in pregnancy
• Reproductive timing is increasingly important

IVF allows eggs to be retrieved directly from the ovaries and fertilized outside the body, reducing dependence on normal tubal function.

Surgery

Surgery may be considered when there is:

• Significant pain
• Large or concerning endometriomas
• Pelvic anatomy that may be affecting fertility
• Other clinical reasons for operative treatment

However, ovarian surgery requires careful consideration when fertility is a priority because ovarian tissue and reserve may be affected.

The decision should be individualized rather than based on the presence of endometriosis alone.

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When Endometriosis and Fertility Concerns Should Be Evaluated

Patients may benefit from fertility evaluation when:

• Pregnancy has not occurred after an appropriate period of trying
• There is known or suspected endometriosis
• Menstrual pain is severe
• Pelvic pain is persistent
• There is pain during intercourse
• Ovarian endometriomas are present
• There has been previous ovarian surgery
• Ovarian reserve is low
• Fallopian-tube damage is suspected
• Pregnancy is being delayed and fertility preservation is being considered
• Previous IUI or IVF treatment has not resulted in pregnancy
• Recurrent pregnancy loss has occurred
• Fertility treatment planning is becoming more time-sensitive

Earlier evaluation may be appropriate when multiple fertility factors are present.

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A reproductive endocrinologist can help determine whether natural conception, IUI, IVF, surgery, or another approach is most appropriate based on the patient's overall reproductive situation.

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Disclaimer

This website and its contents are intended for informational purposes only and are not intended to diagnose, treat, cure, or prevent any disease. Whenever possible, patients are advised to seek professional care from a qualified healthcare professional for proper medical evaluation and treatment.

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