Endometriosis is a common but often underdiagnosed gynaecological condition that can cause severe period pain, chronic pelvic pain, heavy menstrual bleeding, painful sex, bowel or bladder symptoms, and difficulty getting pregnant.
For many women, endometriosis symptoms are initially mistaken for “normal period pain.” However, pain that repeatedly interferes with work, sleep, relationships, exercise, or everyday activities deserves medical evaluation.
According to the World Health Organization (WHO), endometriosis affects an estimated 10% of women of reproductive age worldwide, or approximately 190 million people. It is a chronic condition that can significantly affect quality of life and fertility. WHO: Endometriosis
This complete guide explains what endometriosis is, its symptoms, causes, stages, diagnosis, treatment options, surgery, fertility implications, lifestyle measures, and when to see a gynaecologist.
What Is Endometriosis?
Endometriosis is a chronic inflammatory condition in which tissue similar to the lining of the uterus grows outside the uterus.
These endometriosis lesions may occur around:
- Ovaries
- Fallopian tubes
- Pelvic lining
- Uterus
- Bladder
- Bowel
- Other areas of the pelvis
Rarely, endometriosis can occur outside the pelvis.
These lesions can respond to hormonal changes during the menstrual cycle, causing inflammation, irritation, bleeding within the surrounding tissues, and eventually scar tissue or adhesions.
Endometriosis is not simply painful periods. It can affect physical health, emotional wellbeing, sexual health, daily activities, and fertility.
Endometriosis Symptoms
The symptoms of endometriosis vary considerably. Some women have severe symptoms with relatively limited disease, while others may have extensive endometriosis with few or no symptoms.
Common endometriosis symptoms include:
1. Severe Period Pain
One of the most common symptoms is severe menstrual pain, also called dysmenorrhoea.
The pain may:
- Begin before the period
- Continue throughout menstruation
- Radiate to the lower back or legs
- Become progressively worse over time
- Interfere with work or normal activities
Pain that repeatedly prevents you from functioning normally should not simply be accepted as “normal periods.”
2. Chronic Pelvic Pain
Some women experience pelvic pain even when they are not menstruating.
The pain may feel:
- Dull or aching
- Sharp or stabbing
- Burning
- Deep inside the pelvis
- Worse around menstruation or ovulation
Chronic pelvic pain can have several causes, including endometriosis, adenomyosis, fibroids, pelvic infections, ovarian conditions, and other disorders.
3. Pain During or After Sex
Deep pain during sexual intercourse is another possible symptom.
This may be particularly noticeable with deep penetration and can continue for some time after intercourse.
Persistent painful sex should be discussed with a gynaecologist rather than assumed to be normal.
4. Heavy or Prolonged Periods
Some women with endometriosis experience heavy menstrual bleeding or prolonged periods.
If your periods are unusually heavy, it is important to investigate other possible causes as well. For a broader understanding of abnormal bleeding, see our guide to heavy menstrual bleeding causes and treatment.
5. Painful Bowel Movements
Endometriosis affecting the bowel or tissues around it may cause:
- Pain during bowel movements
- Constipation
- Diarrhoea
- Bloating
- Abdominal pain
- Symptoms that become worse around periods
These symptoms can sometimes be confused with irritable bowel syndrome.
6. Painful Urination
When endometriosis affects the bladder or surrounding tissues, women may experience:
- Pain while urinating
- Pelvic pressure
- Urinary frequency
- Symptoms that worsen during periods
Urinary symptoms require proper evaluation because urinary infections and other bladder conditions can produce similar symptoms.
7. Infertility or Difficulty Getting Pregnant
Endometriosis may affect fertility through inflammation, adhesions, ovarian involvement, or changes affecting the pelvic reproductive organs.
If you have been trying to conceive without success, an appropriate infertility evaluation can help identify whether endometriosis or another fertility factor is involved.
WHO also recognizes endometriosis as one of the conditions associated with female infertility. WHO information on infertility
8. Fatigue
Persistent fatigue is commonly reported by people living with endometriosis.
Pain, poor sleep, inflammation, heavy bleeding, anaemia, and the emotional burden of chronic symptoms may all contribute to tiredness.
Once endometriosis has been diagnosed, treatment is individualized according to symptoms, severity and reproductive goals. Learn more about endometriosis treatment options and how medicines, hormonal therapy and lifestyle changes may help manage symptoms
What Causes Endometriosis?
The exact cause of endometriosis is still not fully understood.
Several mechanisms have been proposed, including:
- Retrograde menstruation
- Genetic factors
- Immune-system differences
- Hormonal influences
- Metaplastic changes
- Spread of endometrial-like cells through blood or lymphatic vessels
It is likely that several factors contribute rather than there being one single cause.
Importantly, endometriosis is not caused by something a woman has done wrong.
Who Is at Risk of Endometriosis?
Endometriosis can occur from adolescence through the reproductive years.
Risk may be higher in women with:
- A family history of endometriosis
- Early onset of menstruation
- Short menstrual cycles
- Heavy menstrual bleeding
- Long periods
- Certain reproductive or anatomical factors
However, endometriosis can occur without obvious risk factors.
Endometriosis and Period Pain: What Is Normal?
Mild menstrual cramps can be common.
However, severe period pain is a reason to seek medical evaluation, particularly when:
- Pain makes you miss work or school
- You need strong pain medication regularly
- Pain is getting worse each month
- Pain occurs outside your periods
- Sex becomes painful
- Bowel movements become painful
- You have difficulty getting pregnant
The WHO emphasizes that severe menstrual pain and other disruptive menstrual symptoms deserve appropriate evaluation. WHO menstrual health guidance
If you frequently experience abnormal menstrual symptoms, our complete menstrual cycle guide can help you understand what may be normal and when evaluation is advisable.
Endometriosis vs Adenomyosis
Endometriosis and adenomyosis are different conditions, although they can produce similar symptoms.
Endometriosis
Endometriosis occurs when endometrium-like tissue develops outside the uterus.
Adenomyosis
Adenomyosis occurs when endometrium-like tissue grows within the muscular wall of the uterus.
Both can cause:
- Painful periods
- Heavy bleeding
- Pelvic pain
- Fertility problems
Because the symptoms overlap, proper clinical assessment and imaging may be necessary.
Endometriosis vs Fibroids
Fibroids are benign growths arising from the muscular tissue of the uterus.
They can cause:
- Heavy periods
- Pelvic pressure
- Period pain
- Abdominal fullness
- Frequent urination
- Fertility problems
You can learn more about uterine fibroids, their symptoms and treatment options.
A woman can also have both fibroids and endometriosis, so persistent symptoms should not automatically be attributed to one condition.
How Is Endometriosis Diagnosed?
Diagnosing endometriosis can sometimes be challenging because symptoms overlap with several other conditions.
Your doctor will usually begin with:
1. Medical and Menstrual History
Your gynaecologist may ask about:
- Age when periods started
- Cycle length
- Period duration
- Pain severity
- Heavy bleeding
- Pain during sex
- Bowel symptoms
- Bladder symptoms
- Previous pregnancies
- Fertility concerns
- Family history
Keeping a menstrual and pain diary can be useful.
2. Pelvic Examination
A pelvic examination may sometimes identify:
- Pelvic tenderness
- Ovarian enlargement
- Reduced pelvic organ mobility
- Tender nodules
However, a normal examination does not rule out endometriosis.
3. Ultrasound
A pelvic or transvaginal ultrasound may help identify:
- Endometriomas
- Ovarian cysts
- Deep endometriosis in some cases
- Adenomyosis
- Fibroids
- Other pelvic abnormalities
A normal ultrasound does not necessarily exclude all forms of endometriosis.
4. MRI
MRI can provide more detailed information about certain types of deep endometriosis and its relationship with pelvic organs.
It may be particularly useful when deep infiltrating disease is suspected or when surgery is being planned.
5. Laparoscopy
Laparoscopy is a minimally invasive surgical procedure in which a camera is inserted through small abdominal incisions.
It can allow the surgeon to directly inspect the pelvis and, when appropriate, treat endometriosis during the procedure.
Current guidance recognizes that surgery is not necessarily required before starting treatment in every patient; diagnosis can be based on symptoms and imaging in appropriate circumstances. WHO endometriosis diagnosis guidance
Stages of Endometriosis
Endometriosis is commonly classified into four stages:
Stage I – Minimal
Small superficial lesions with little or no scar tissue.
Stage II – Mild
More lesions may be present and may be deeper.
Stage III – Moderate
More extensive disease, ovarian endometriomas, and adhesions may occur.
Stage IV – Severe
Extensive endometriosis, large endometriomas, dense adhesions, and involvement of pelvic organs may occur.
However, stage does not always predict pain severity.
A woman with stage I disease may experience severe pain, while another woman with stage IV disease may have relatively mild symptoms.
Treatment decisions should therefore consider symptoms, fertility goals, disease location, age, previous treatment, and personal preferences—not the stage alone.
Endometriosis Treatment
There is currently no definitive cure for endometriosis, but treatment can control symptoms, reduce pain, improve quality of life, and address fertility concerns.
Treatment depends on:
- Severity of symptoms
- Location of disease
- Age
- Fertility plans
- Previous treatments
- Other medical conditions
- Personal preferences
Treatment depends on the severity of symptoms, location of the lesions and whether pregnancy is desired. For women who may need operative treatment, our guide to endometriosis surgery and laparoscopy explains how the procedure is performed, recovery time, possible risks and fertility considerations.
1. Pain Relief Medicines
Painkillers such as NSAIDs may help relieve menstrual and pelvic pain in some women.
Your doctor can advise which medicine is appropriate and how it should be used safely.
2. Hormonal Treatment
Hormonal treatments can reduce or suppress the hormonal stimulation of endometriosis lesions.
Options may include:
- Combined hormonal contraceptives
- Progestin medications
- Hormonal intrauterine systems
- GnRH-related medicines
- Other hormonal therapies in selected patients
Hormonal treatment can be useful for women who are not currently trying to become pregnant.
Treatment should be individualized because different medications have different benefits, side effects, and contraindications.
3. Surgery for Endometriosis
Surgery may be considered when:
- Pain remains severe despite medical treatment
- Endometriosis is extensive
- An endometrioma is causing significant problems
- Deep endometriosis affects organs
- Endometriosis is contributing to fertility problems in selected situations
- Symptoms significantly affect quality of life
Laparoscopic surgery may involve removal or destruction of endometriosis lesions and treatment of adhesions or ovarian endometriomas.
The appropriate surgical approach depends heavily on the location and extent of disease and the surgeon’s expertise.
For women considering minimally invasive gynaecological surgery, our guide to laparoscopic hysterectomy surgery explains the procedure, recovery and common indications.
Is Hysterectomy a Cure for Endometriosis?
Hysterectomy means removal of the uterus.
It may occasionally be considered for women with severe symptoms who have completed childbearing and have not responded adequately to other treatments.
However, hysterectomy is not automatically a cure for endometriosis because endometriosis occurs outside the uterus and lesions can remain after the uterus is removed.
WHO specifically notes that hysterectomy may be considered in selected patients but is not a guaranteed cure. WHO endometriosis treatment information
Women considering hysterectomy should understand the different surgical options, including types of hysterectomy and ovarian preservation.
Surgery may be considered in selected women with severe endometriosis, although hysterectomy is not automatically a cure. If hysterectomy is being discussed, our laparoscopic hysterectomy video guide provides a visual overview of the procedure and recovery.
Endometriosis and Infertility
One of the major concerns for women with endometriosis is fertility.
Endometriosis may affect fertility because of:
- Pelvic inflammation
- Adhesions
- Distortion of pelvic anatomy
- Ovarian endometriomas
- Effects on fallopian tubes
- Changes in the pelvic environment
However, having endometriosis does not mean you cannot become pregnant.
Some women conceive naturally, while others may require medical or fertility treatment.
Depending on age, ovarian reserve, duration of infertility, disease severity, and other fertility factors, treatment may include:
- Timed intercourse
- Ovulation-related treatment when appropriate
- Intrauterine insemination (IUI)
- IVF
- Surgery in selected patients
WHO notes that fertility treatments such as IUI or IVF may be considered for people struggling to conceive because of endometriosis. WHO fertility and endometriosis information
Can Endometriosis Come Back After Treatment?
Yes.
Endometriosis symptoms or lesions can recur after treatment.
Recurrence may depend on:
- Extent of disease
- Type of surgery
- Age
- Hormonal factors
- Whether postoperative hormonal treatment is used
- Individual characteristics
This is why long-term follow-up can be important for women with significant or recurrent symptoms.
Endometriosis During Pregnancy
Endometriosis does not necessarily prevent pregnancy.
Some women with endometriosis conceive naturally, while others need fertility assistance.
Once pregnancy occurs, pregnancy-related care should be individualized based on the woman’s overall health, previous surgery, disease severity, and obstetric history.
Diet and Lifestyle for Endometriosis
There is no specific diet proven to cure endometriosis.
However, maintaining a generally healthy lifestyle may support overall wellbeing.
Helpful measures may include:
- Eating a balanced diet
- Including vegetables, fruits, whole grains and adequate protein
- Maintaining a healthy weight
- Regular physical activity as tolerated
- Adequate sleep
- Stress-management techniques
- Avoiding smoking
- Limiting alcohol
Some women notice that particular foods worsen bloating or gastrointestinal symptoms. A food and symptom diary can help identify individual triggers.
Lifestyle measures should complement—not replace—appropriate medical treatment.
Can Endometriosis Be Cured?
At present, there is no guaranteed permanent cure for endometriosis.
However, many women can achieve substantial symptom improvement with an individualized combination of:
- Pain management
- Hormonal treatment
- Surgery when appropriate
- Fertility treatment when needed
- Pelvic health and supportive therapies
- Long-term follow-up
The goal is not simply to treat an ultrasound finding. Treatment should focus on pain relief, quality of life, fertility goals, and long-term health.
When Should You See a Gynaecologist?
You should consider a gynaecological evaluation if you have:
- Severe period pain
- Pain that is getting progressively worse
- Chronic pelvic pain
- Pain during sex
- Painful bowel movements during periods
- Painful urination during periods
- Heavy or prolonged periods
- Persistent bloating with menstrual symptoms
- Unexplained fatigue
- Difficulty getting pregnant
- Pelvic pain that does not improve with usual treatment
Do not feel that you simply have to “live with” severe period pain.
Early assessment may help identify endometriosis or another treatable cause.
Frequently Asked Questions About Endometriosis
1.Is severe period pain always endometriosis?
No. Severe period pain can have several causes, including endometriosis, adenomyosis, fibroids and pelvic infections. Endometriosis should be considered when pain is severe, persistent or associated with other symptoms.
2.Can endometriosis cause infertility?
Yes. Endometriosis can affect fertility, although many women with endometriosis are able to become pregnant naturally or with fertility treatment.
3.Can endometriosis be seen on ultrasound?
Some forms of endometriosis, particularly ovarian endometriomas and certain deep lesions, may be identified on ultrasound. A normal ultrasound does not exclude all endometriosis.
4. Does endometriosis always cause pain?
No. Some women with endometriosis have few or no symptoms.
5. Can endometriosis cause heavy periods?
It can be associated with heavy menstrual bleeding, although heavy bleeding has many possible causes and requires appropriate evaluation.
6. Can endometriosis affect the bowel?
Yes. Endometriosis can affect the bowel or tissues around it and may cause painful bowel movements, bloating, constipation, diarrhoea or cyclical abdominal symptoms.
7. Can endometriosis affect the bladder?
Yes. Bladder or urinary-tract endometriosis can cause urinary symptoms, particularly around menstruation.
8. Does endometriosis go away after menopause?
Endometriosis is generally less active after menopause because ovarian hormone levels decline, but symptoms or disease can persist in some women. Postmenopausal pelvic pain or bleeding should always be evaluated.
9. Is surgery always necessary for endometriosis?
No. Many women can initially be treated with medicines and hormonal therapy. Surgery is considered according to symptoms, disease extent, fertility goals and response to other treatments.
Key Takeaways
Endometriosis is a chronic gynaecological condition that can cause severe period pain, chronic pelvic pain, painful sex, bowel or bladder symptoms, heavy bleeding and fertility problems.
The most important points to remember are:
- Severe period pain is not something you should automatically consider normal.
- Endometriosis can occur even when an ultrasound is normal.
- Symptoms vary greatly between women.
- Endometriosis can affect fertility but does not automatically mean infertility.
- Treatment should be individualized.
- Medicines can help control symptoms.
- Surgery may be appropriate for selected patients.
- Endometriosis can recur after treatment.
- Hysterectomy is not a guaranteed cure.
- Early evaluation can help improve symptom control and quality of life.
If persistent pelvic pain, severe periods, painful sex or fertility difficulties are affecting your life, a consultation with an experienced gynaecologist can help determine whether endometriosis or another condition may be responsible.
Authoritative Medical References
For reliable, evidence-based information, patients can also refer to:
- World Health Organization (WHO): Endometriosis — information on symptoms, diagnosis, treatment, fertility and the global burden of endometriosis.
WHO Endometriosis Fact Sheet - NHS: Endometriosis — practical information about symptoms, investigations, ultrasound, MRI, laparoscopy and treatment.
NHS Endometriosis Guide - World Health Organization: Infertility — evidence-based information about infertility and its causes, including endometriosis.
WHO Infertility Information - WHO: Menstrual Health — guidance explaining why severe, painful or disruptive menstrual symptoms should be evaluated.
WHO Menstrual Health Information
Medical Disclaimer
This article is intended for general educational purposes and does not replace an individual medical consultation. Endometriosis symptoms can overlap with adenomyosis, fibroids, ovarian cysts, pelvic infections, bowel disorders and other conditions. Diagnosis and treatment should be individualized by a qualified healthcare professional.
Reviewed by Dr. Mamta Agrawal, Consultant Obstetrician & Gynaecologist, Delhi.
