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Endometriosis: Causes, Symptoms, Types & Tests

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08 Sep, 2026

Dr. Nikunj Jain

Dr. Nikunj Jain

Co-Founder and HOD - Nuclear Medicine ,

MBBS, DRM, DNB, FEBNM, FANMB, Dip. CBNC

Endometriosis: Causes, Symptoms, Types & Tests

Endometriosis is a condition where the lining of the womb develops somewhere outside the womb, which can last a long time. It usually occurs in parts of the pelvis and can lead to flare-ups of inflammation, pain, and scarring. In a few patients, endometriosis can also be found elsewhere in the body.

 

It continues to affect individuals throughout their reproductive years from the onset until menopause, and significantly impacts quality of life, relationships, fertility, and emotional states. Some symptoms are very deep pain during menses, chronic pelvic pain, heavy menses, painful penetration or dyspareunia, and problems conceiving.

 

Adequate treatment depends on timely recognition and evaluation to help manage the condition and minimize the impact on quality of life. Molecular Diagnostics and Therapy offers sophisticated diagnostic imaging solutions that aid in the assessment of gynaecological conditions, as per patients' medical needs.

What Is Endometriosis?

With endometriosis, the lining of your uterus forms outside your uterus. Hormonal flux in the menstrual cycle causes these areas of tissue to become inflamed, swollen, and painful. The most common female organs involved with endometriosis are the ovary, fallopian tubes, and uterine/pelvic lining. In some instances, it impacts other parts of the body too. The condition differs greatly from person to person. Some people have only a few or no signs or symptoms. 

What Causes Endometriosis?

The exact reason for endometriosis is not quite understood. It is thought that there are several factors in its development. Some have been found to be linked to immune system problems and family history. If you have a close relative who has endometriosis, it is more likely that you also get the disease. But having a family history doesn't mean you also have the illness. Additional studies are required to further elucidate the mechanisms of development of endometriosis and the variations between individuals.

Symptoms of Endometriosis

Symptoms of endometriosis differ from one woman to another. Others have pain levels that are quite severe, whereas others have very mild pain levels, and some individuals might not experience any at all.

Painful Periods

Many women experience severe menstrual pain with endometriosis. The pain can be more severe than a woman's period cramps and affect their ability to go about her everyday life.

Chronic Pelvic Pain

For some women who get pelvic pain, these pains extend beyond the period. The pain is more or less frequent or more or less intense in terms of it occurring at various stages throughout the menstrual cycle.

Heavy Menstrual Bleeding

Heavy periods and heavy menstrual bleeding, or long periods, occasionally occur in a woman with endometriosis. If bleeding is heavy, it leads to iron deficiency and consequently some level of fatigue.

Pain During Intercourse

Endometriosis makes sex painful or causes pain that doesn't go away after the end of sex, especially when lesions are located in the tissues around pelvic organs.

Pain During Bowel Movements or Urination

Some people may experience pain during bowel movements or urination, particularly around the time of menstruation.

Infertility or Difficulty Conceiving

Endometriosis also leads to difficulty becoming pregnant or infertility. But even women with endometriosis don't have to be infertile.

Other Symptoms

Abdominal swelling, nausea, or stomach problems happen in some people. Symptoms are shared with many other problems, and this makes the diagnosis difficult.

Types of Endometriosis

The way that the lesions of endometriosis are located and whether the lesions penetrate and grow in surrounding tissue are used to describe endometriosis.

Superficial Endometriosis

Superficial endometriosis is a condition in which there are lesions over the surface of the tissues of the pelvis. These lesions are superficially shallow and yet produce marked symptoms.

Ovarian Endometriosis

When endometriosis affects the ovaries, it can lead to cysts known as endometriomas. These cysts contain old blood and are sometimes referred to as “chocolate cysts.”

Deep Endometriosis

When endometriosis-like cells penetrate deeper into the tissues, they cause deep endometriosis and affect other tissues, including the bowel, the bladder, or the tissues around the reproductive organs. The amount and type of endometriosis may vary, and symptoms do not always relate directly to the amount of disease.

How Is Endometriosis Diagnosed?

The diagnosis of endometriosis is difficult because the symptoms are similar to those seen in other health conditions affecting the womb, kidney, or gut. Physicians start by taking a thorough medical and menstrual history. They ask about pain during the period, its regularity or irregularity, pain in the pelvic area, symptoms of bowel or urinary issues, pain during sex, fertility problems, or family history.

 

A physical exam is done as well. Images are taken with an ultrasound or MRI, depending on the symptoms and clinical findings. Surgery is not always necessary before starting treatment. In suitable cases, a clinical diagnosis is possible, based on the appearance of symptoms and the imaging tests.

Tests for Endometriosis

Pelvic Ultrasound

If there is a suspicion of endometriosis, the ultrasound is a frequent diagnostic method. It helps to assess the uterine and ovarian tissues and detect the presence of ovarian endometriomas and some other abnormalities. During the assessment, one of the first imaging tests that could be performed would be an ultrasound when evaluating suspected endometriosis or when there is pelvic pain.

MRI Scan

MRI gives your physician a lot more information about the organs and soft tissues of the pelvis. It is especially helpful if there is any suspicion of the presence of deep endometriosis, or if there is a desire to have more in-depth information after a preliminary assessment. MRI is useful in determining the site and size of lesions and how they relate to other pelvic structures.

Laparoscopy

Laparoscopy is a minimally invasive surgical procedure in which a camera is inserted through a small incision to directly examine the pelvic organs. During the procedure, doctors may be able to identify endometriosis lesions and, when appropriate, remove tissue for examination. Laparoscopy may be recommended in selected cases, although surgery is not necessarily required before starting treatment.

Blood Tests

There is currently no routine blood test that can independently confirm endometriosis. Researchers are studying new diagnostic approaches, including blood-based and other non-invasive tests, but these are still developing.

Why Are Endometriosis Tests Important?

Diagnostic tests can help doctors understand the possible cause of pelvic pain, menstrual problems, infertility, or other symptoms. Imaging can also help identify endometriomas and certain forms of deep endometriosis. Because symptoms may overlap with other conditions, a combination of medical history, examination, and appropriate investigations can help doctors make a more informed assessment. Early evaluation is particularly important when symptoms are severe, persistent, or affecting daily life, fertility, work, or relationships.

Conclusion

Endometriosis is a long-term disease that localizes the growth of tissue that is similar to the endometrium outside of the uterus. It leads to painful periods, chronic pelvic pain, heavy periods, painful intercourse, bowel changes and/or difficult, frequent urination, and difficulty conceiving. The exact cause of endometriosis is still unknown, though family history suggests there are immune and family-related factors. Symptoms are very variable and sometimes are confused with other conditions, so the diagnosis might be delayed. 

 

Evaluation consists of a full medical history, physical examination, pelvic ultrasound, MRI, and selected cases require laparoscopy. Treatment often doesn't necessarily require surgery, and physicians also use symptoms and imaging tests to help direct treatment. If these symptoms of the menstrual or pelvic period (hystromenorrhea) are symptoms that last a long time or are becoming more intense, it is recommended to seek medical advice so that it is possible to find out the cause and to act in time. Molecular Diagnostics and Therapy is a cutting-edge diagnostic imaging department to assist healthcare professionals in the assessment of gynecological diseases based on each patient's medical needs.

Frequently Asked Questions

Endometriosis is a chronic condition in which tissue similar to the lining of the uterus grows outside the uterus, commonly affecting areas within the pelvis.

Common symptoms include severe menstrual pain, chronic pelvic pain, heavy menstrual bleeding, pain during intercourse, pain during bowel movements or urination, and difficulty becoming pregnant.

The exact causes of endometriosis are not fully known. Research suggests that factors such as immune-system changes and family history may be associated with the condition.

Endometriosis may be described as superficial endometriosis, ovarian endometriosis involving endometriomas, or deep endometriosis affecting tissues and organs deeper within the pelvis.

Evaluation may include a medical history, physical examination, pelvic ultrasound, and MRI. Laparoscopy may be recommended in selected cases.

Yes. MRI can provide detailed images of the pelvic organs and may help identify and assess certain forms of endometriosis, particularly deep endometriosis.

No. In appropriate cases, doctors may make a clinical diagnosis based on symptoms and imaging findings such as ultrasound or MRI without requiring surgery before starting treatment.

Molecular Diagnostics and Therapy provides advanced diagnostic imaging services, including ultrasound and MRI, to support the evaluation of endometriosis and other gynecological conditions according to the patient's clinical requirements.

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