Endometriosis

Introduction

Endometriosis is a condition in which tissue similar to the uterine lining grows outside the uterus—commonly on the ovaries, pelvic peritoneum, and sometimes bowel or bladder. It is not cancer and is not the same as an endometrial polyp; it is a chronic inflammatory, often painful disease that can also affect fertility.

Pain severity does not always match the amount of disease seen on imaging or surgery: mild disease can cause severe pain, and extensive disease can cause little pain. Delayed diagnosis is common when period pain is dismissed as “normal.”

Care may include pain relief, hormonal therapy, laparoscopic surgery, and fertility support, depending on whether the priority is pain control, pregnancy, or both. A single permanent cure is not always possible, but symptoms and quality of life can often be improved.

This page is general education. Severe period pain, pain with sex, or difficulty conceiving should be discussed with a gynaecologist.

Overview

Main patterns include superficial peritoneal lesions (most common), ovarian endometriomas (“chocolate cysts”), and deeply infiltrating disease involving bowel or bladder (roughly 1–5% of cases). Staging runs from minimal to severe based on lesion depth, adhesions, and cysts.

Symptoms may overlap with pelvic inflammatory disease, ovarian cysts, or irritable bowel syndrome, which can delay diagnosis. Risk factors include early menarche, late menopause, short cycles, heavy periods, family history, never having given birth, and higher estrogen exposure.

Symptoms often ease temporarily in pregnancy and frequently improve after menopause. Goals of care are pain relief, protecting fertility when desired, and limiting organ damage from adhesions or cysts.

• Endometrium-like tissue outside the uterus—benign but inflammatory and painful
• Not cancer and not a uterine polyp
• Key clues: dysmenorrhea, pain with sex, infertility
• Types: peritoneal, endometrioma, deeply infiltrating
• Diagnosis: history, ultrasound/MRI; laparoscopy often confirms
• Treatment: NSAIDs, hormones, conservative surgery, fertility care

What happens in the body

One leading theory is retrograde menstruation: menstrual blood flows back into the pelvis, allowing endometrium-like cells to implant, thicken, and bleed with each cycle, driving inflammation and adhesions. Other theories include peritoneal cell transformation, embryonic cell change under estrogen, implant into surgical scars, and spread via blood or lymph.

If the immune system fails to clear abnormal tissue, disease persists. Inflammation can disrupt ovulation, tubal function, and implantation—major pathways to infertility.

• Retrograde menstruation → pelvic implants
• Cyclic bleeding of ectopic tissue → inflammation and pain
• Adhesions can tether organs and impair fertility
• Immune clearance failure allows tissue to persist
• Growth is estrogen-dependent

Signs and symptoms

Pelvic pain linked to periods is the hallmark, but intensity can be misleading. Common features include:

• Painful periods (dysmenorrhea)—pain may start before bleeding and continue after
• Lower back and abdominal pain
• Pain during or after sex (dyspareunia)
• Pain with bowel movements or urination—especially during menses
• Heavy periods or spotting between cycles
• Difficulty conceiving
• Fatigue
• Diarrhoea, constipation, bloating, or nausea around periods
• One-sided pressure or pain from an ovarian chocolate cyst
• Chronic pelvic pain outside menstruation
• Urinary frequency or incomplete emptying sensation
• Missed school or work because of period pain
• Mild pain despite extensive disease—or severe pain with limited disease

Causes and risk factors

The exact cause is unknown. Plausible explanations and risk factors include:

• Retrograde menstruation
• Transformation of peritoneal cells into endometrium-like cells
• Embryonic cell transformation under estrogen influence
• Implantation into caesarean or hysterectomy scars
• Transport of cells through blood or lymph
• Immune system disorder
• Family history of endometriosis
• Early menarche, late menopause, short cycles, heavy flow
• Never having given birth / higher estrogen exposure
• Anatomic barriers to menstrual outflow

Diagnosis and evaluation

Timing and location of pain matter. Confirmation often needs laparoscopy, though imaging helps plan care:

• Detailed pain and menstrual history
• Pelvic exam—cysts or scarring may be felt; small lesions often are not
• Transvaginal or abdominal ultrasound—useful for endometriomas
• MRI for deep lesions and surgical planning
• Laparoscopy with possible biopsy—direct view and same-session treatment in many cases
• Distinguishing from PID, IBS, and ovarian cysts
• Fertility evaluation when pregnancy is desired

Treatment and management

Plans balance pain control and fertility goals. Conservative steps are often tried before major surgery:

• NSAIDs (such as ibuprofen or naproxen) for cramps—as advised by a clinician
• Hormonal contraceptives to lighten bleeding and reduce pain
• GnRH agonists or antagonists to lower estrogen and shrink tissue (with add-back therapy when appropriate)
• Progestin therapy via IUD, injection, pill, or implant
• Aromatase inhibitors as selected add-on therapy
• Conservative laparoscopy to remove implants while preserving uterus and ovaries
• Fertility treatment from ovarian stimulation through IVF when needed
• Hysterectomy with or without ovary removal in selected severe cases—not always a permanent cure
• Heat, gentle exercise, and stress management as supportive measures

Prevention, self-care, and lifestyle

Not every condition is fully preventable, but the steps below may lower risk or recurrence:

• Seek evaluation early for severe period pain rather than years of self-treatment alone
• If there is a strong family history, discuss symptoms sooner
• Treat long-standing irregular or heavy periods under medical care
• Avoid smoking and maintain a healthy weight
• If pregnancy is desired, avoid unnecessary long delays when disease is active
• Keep follow-up after diagnosis to watch for recurrence

Possible complications

Delay, missed care, or unsafe self-medication can raise the chance of complications in some cases:

• Chronic pelvic pain and reduced quality of life
• Infertility (difficult in roughly one-third to one-half of cases)
• Endometriomas damaging healthy ovarian tissue
• Bowel or bladder dysfunction when those organs are involved
• Pelvic adhesions binding organs together
• Slightly increased ovarian cancer risk overall still low

When to see a doctor or seek emergency care

Seek prompt medical advice or emergency care if any of the following apply—it is safer not to wait and see:

• Period pain that disrupts daily life
• Pain with sex or chronic pelvic pain outside menses
• Trying to conceive for a year without success (sooner if age 35+)
• Pain or blood with bowel or bladder function during periods
• Sudden severe one-sided abdominal pain (possible cyst complication)
• Pain that remains uncontrolled despite current treatment

Living with the condition

A pain diary noting cycle day, food, and stress can reveal triggers. Warm packs and light activity help many people; use NSAIDs only as directed.

If pregnancy is a goal, involve a fertility specialist early—disease can progress with time. Share accurate information with partners and family to reduce isolation.

Complementary approaches such as acupuncture interest some people; discuss reputable practitioners with your main clinician and do not stop prescribed care without advice.

Frequently asked questions

Is endometriosis cancer?

No—it is usually benign. It can invade nearby tissues and cause adhesions. Ovarian cancer risk may be slightly higher, but absolute risk remains low for most people.

How do I know if I have endometriosis?

Severe period pain, pain with sex, heavy bleeding, or infertility raise suspicion. Definitive diagnosis often needs laparoscopy; ultrasound may show ovarian cysts.

Can I still get pregnant?

Many people do. About 30% have difficulty. Laparoscopy and fertility treatments help in mild-to-moderate disease; each case differs.

Is there a permanent cure?

Not always. Surgery aims to remove disease and medicines aim to control symptoms. Hysterectomy is not a guaranteed permanent cure for everyone.

What if it is left untreated?

Chronic pain, infertility, cysts, and bowel or bladder problems can worsen and quality of life can fall.

Does it run in families?

Family predisposition can exist, but many patients have no affected relatives. Environment and hormones also matter.

Important caution

This article is general health education in English. It is not personal medical advice.

Do not ignore severe period pain or fertility problems—see a gynaecologist for assessment.

With tailored medical and surgical care, many people achieve better pain control and life quality.