Endometriosis: What Are the Early Symptoms, and Why Do So Many Women Take So Long to Be Diagnosed?
Endometriosis affects approximately 190 million women of reproductive age worldwide, according to the World Health Organization. In Brazil, according to the Brazilian Federation of Gynecology and Obstetrics Associations (Febrasgo), it is estimated that one in ten women in this same age group lives with the condition. Despite these significant numbers, the average time between the onset of symptoms and a confirmed diagnosis is still around 7 years, according to the Ministry of Health. This figure reveals a problem that goes far beyond the clinical complexity of the disease: there is a deeply entrenched culture of normalizing women’s pain that delays diagnosis and compromises the quality of life for millions of women.
Why has such a prevalent condition remained underdiagnosed for so long? Part of the answer lies in the fact that the initial symptoms of endometriosis overlap with complaints considered “normal” for the menstrual cycle. Severe cramps, heavy flow, and pelvic discomfort are often treated as expected variations of menstruation, both by those experiencing them and, in many cases, by healthcare professionals who do not investigate them thoroughly. This confusion between what is physiological and what is pathological creates a gap in clinical attention that can last for years.
This content outlines the main signs that may indicate endometriosis in its early stages, explains the relationship between the disease and abnormal uterine bleeding, and details the factors that contribute to delays in diagnosis. The goal is to provide clear, evidence-based information so that women can recognize symptoms that warrant further investigation and seek medical care with greater confidence. None of the information here replaces a professional evaluation, but knowing the signs is the first step toward receiving appropriate care more quickly.
What is endometriosis, and why is it so underdiagnosed?
Endometriosis is a chronic condition in which tissue similar to the endometrium (the lining of the uterus) grows outside the uterine cavity. This tissue can develop on the ovaries, fallopian tubes, peritoneum, bladder, intestines, and, in rarer cases, in distant organs such as the diaphragm. Like the normal uterine endometrium, this tissue responds to the hormones of the menstrual cycle, causing inflammation, adhesions, and pain.
The condition is considered underdiagnosed due to a combination of factors. The first of these is clinical: there is no single, simple test that can identify all forms of the disease, especially in the early stages. Symptom assessment, a clinical examination, and imaging tests—such as specialized transvaginal ultrasound (with bowel preparation when indicated) and pelvic MRI—can aid in diagnosis, particularly in cases of endometrioma and deep endometriosis. However, normal imaging results do not rule out the disease, especially when superficial lesions are suspected. In some cases, laparoscopy may be considered for diagnosis and treatment, particularly when imaging findings are inconclusive or when symptoms persist despite treatment.
The second factor is cultural. Severe menstrual pain is still widely accepted as an inevitable part of a woman’s reproductive life. This perception leads many women to live with significant symptoms without seeking specialized evaluation. And when they do seek care, they do not always find healthcare professionals prepared to suspect endometriosis in the face of symptoms that, at first glance, seem common.
The third factor is time. Endometriosis can begin with mild symptoms during adolescence and progress silently. Without active investigation, years can pass between the first complaint and a formal diagnosis.
Early symptoms that are often mistaken for ordinary colic
The early signs of endometriosis are often mistaken for primary dysmenorrhea, which is menstrual cramping with no identifiable organic cause. This similarity is precisely what makes early diagnosis of the disease difficult. However, there are characteristics that distinguish endometriosis-related pain from typical menstrual cramping.
Disproportionate intensity of pain
Primary dysmenorrhea usually begins shortly before or at the start of menstrual flow and, most commonly, lasts 8 to 72 hours. Headaches, nausea, and vomiting may also accompany these symptoms. Therefore, the distinction between typical menstrual cramps and suspected endometriosis should not be based solely on the presence of these symptoms, but on the intensity and progression of the pain, the lack of response to standard treatment, and the impact on daily life. According to Febrasgo, cramps so severe that they prevent a person from attending school or performing daily activities warrant further investigation, especially when there is progressive pain associated with the menstrual cycle.
Pain that begins before menstruation and persists afterward
Endometriosis pain can manifest as severe cycle-related cramping, chronic pelvic pain, or discomfort that is not limited to the first few days of menstruation. Since primary dysmenorrhea can also begin at the start of menstrual flow or 1 to 2 days before menstruation, the onset before menstruation should not be used in isolation as a distinguishing sign. Suspicion increases when the pain is progressive, interferes with daily activities, persists outside the menstrual period, or is accompanied by other cyclic symptoms, such as intestinal pain, urinary pain, or pain during or after sexual intercourse.
Progressive deterioration over the years
Women with endometriosis often report that their cramps have worsened over time. If menstrual pain was tolerable during adolescence and has become debilitating over the years, this is a significant warning sign. The increasing intensity suggests that something beyond the normal menstrual cycle is happening.
Resistance to Conventional Analgesics
When commonly used anti-inflammatory drugs and pain relievers stop working or provide only partial relief, the condition warrants attention. Endometriosis pain has a chronic inflammatory component and, in many cases, requires a specific therapeutic approach.
Other signs that may indicate endometriosis besides pain
Endometriosis does not manifest itself solely through menstrual cramps. The disease may be associated with a range of symptoms that, when evaluated together and in relation to the menstrual cycle, help raise clinical suspicion:
● Pain during or after sexual intercourse: especially when it is deep pelvic pain, a symptom often described by people with endometriosis.
● Cyclical bowel changes: pain during bowel movements, diarrhea, constipation, abdominal bloating, or rectal discomfort that worsen during menstruation may be associated with endometriosis, especially when intestinal involvement is suspected.
● Cyclic urinary symptoms: pain during urination, urinary urgency, or blood in the urine during menstruation may occur in cases where the urinary tract may be involved and should be evaluated.
● Fatigue: Persistent tiredness or loss of energy is also reported by people with endometriosis and can contribute to a reduced quality of life.
● Difficulty getting pregnant: Endometriosis is associated with infertility and can be diagnosed in a significant proportion of women evaluated for reproductive difficulties.
The presence of these symptoms—especially when they are cyclical, progressive, recurrent, or associated with severe cramping that interferes with daily life—warrants a targeted gynecological evaluation.
What is the relationship between endometriosis and abnormal uterine bleeding?
Although endometriosis and abnormal uterine bleeding are distinct conditions, they may occur together in some women. Abnormal uterine bleeding is defined by changes in the menstrual pattern, such as changes in the volume, duration, frequency, or regularity of the cycle. Its causes are varied and include hormonal changes, polyps, fibroids, adenomyosis, endometrial changes, and other gynecological conditions.
Endometriosis may be associated with heavy or abnormal menstrual bleeding, but this association should be evaluated in conjunction with other symptoms. When heavy or prolonged menstrual flow occurs along with severe cramping, chronic pelvic pain, pain during or after sexual intercourse, infertility, or cyclic bowel and urinary symptoms, a gynecologic evaluation should consider the possibility of endometriosis.
This comprehensive evaluation is important because abnormal bleeding may be one of the reasons a woman seeks medical care. In such cases, the approach should not be limited to treating the bleeding in isolation: it is necessary to investigate the pattern of symptoms, their relationship to the menstrual cycle, and the presence of pain or other associated signs.
To better understand the characteristics of abnormal uterine bleeding, its causes, and when to seek help, we recommend checking out our content on this topic in the women’s health hub.
Why Does It Take So Long to Get a Diagnosis, and What Does That Mean for Women's Health?
The delay in diagnosing endometriosis is widely documented by national and international organizations and guidelines, including the Ministry of Health, FEBRASGO, the European Society of Human Reproduction and Embryology (ESHRE), and the National Institute for Health and Care Excellence (NICE). According to the Ministry of Health, the average time from the onset of symptoms to a confirmed diagnosis is approximately 7 years. This delay is not coincidental. It results from a chain of interrelated factors.
Normalization of Menstrual Pain
The idea that “severe cramps are normal” remains deeply ingrained both in patients’ perceptions and in some clinical practice. Many women grow up hearing that pain is a normal part of their cycle and, as a result, are slow to question the severity of their own symptoms.
Appointments that do not investigate the cause
In many cases, complaints of severe menstrual pain are treated with prescription pain relievers or hormonal contraceptives without investigating the cause of the pain. Although these approaches may relieve symptoms, they can mask the progression of the disease.
Limitations of Initial Exams
Conventional pelvic ultrasound, the most accessible test and one frequently ordered during routine visits, has limitations in detecting superficial forms of endometriosis. More sensitive tests, such as transvaginal ultrasound with bowel preparation, are not always ordered during the initial evaluation.
Consequences of the delay
A delay in diagnosis is not just a matter of prolonged discomfort. Endometriosis is a progressive disease in many cases. Without proper treatment, it can cause pelvic adhesions, damage to adjacent organs, chronic pain that is difficult to control, and reduced fertility. In addition to the physical impact, a delayed diagnosis can prolong the time spent living with symptoms such as chronic pain and impairments in one’s personal, sexual, social, and professional life. According to the WHO and the Ministry of Health, these factors can affect emotional well-being and be associated with psychological distress, anxiety, depression, and social isolation.
When to see a gynecologist to investigate endometriosis
The recommendation is straightforward: any menstrual pain that interferes with daily activities, worsens over time, or does not respond adequately to common pain relievers warrants a gynecological evaluation to determine the cause. It is not necessary to wait until all symptoms are present before seeking an evaluation.
Some signs that indicate the need for more targeted investigation include:
● Cramps that prevent you from carrying out normal activities such as working, studying, or exercising;
● Pelvic pain outside of the menstrual period;
● Pain during or after sexual intercourse;
● Bowel or urinary changes that coincide with menstruation;
● Difficulty getting pregnant after 12 months of trying without contraception;
● Very heavy or prolonged menstrual bleeding.
When visiting a gynecologist, it is helpful to bring a record of your symptoms, including information about the intensity of the pain, the days of your cycle when it occurs, any medications you are taking, and how it affects your daily activities. This history helps the doctor focus the evaluation more precisely.
It’s worth emphasizing: information is an ally, but a diagnosis of endometriosis requires a specialized medical evaluation. Being aware of the signs allows women to arrive at the doctor’s office with more specific questions and with the understanding that their pain deserves to be investigated—not just tolerated.
Frequently Asked Questions About Endometriosis
What are the first symptoms of endometriosis?
The most common initial symptoms are severe and progressively worsening menstrual cramps, pelvic pain that extends beyond the menstrual period, discomfort during sexual intercourse, and, in some cases, cyclical bowel changes. The intensity and persistence of the pain are the main indicators that distinguish endometriosis from ordinary menstrual cramps.
How do I know if I have endometriosis?
Endometriosis cannot be diagnosed based on symptoms alone. Diagnosis involves a detailed clinical evaluation, specialized imaging tests (such as transvaginal ultrasound with bowel preparation or pelvic MRI), and, in some cases, laparoscopy. If you have symptoms that suggest endometriosis, you should see a gynecologist for further evaluation.
Could severe cramping be a sign of endometriosis?
Yes. Severe menstrual cramps that worsen over the course of cycles, do not respond to conventional pain relievers, or prevent you from performing daily activities are one of the main warning signs of endometriosis. Not all severe cramps indicate the disease, but any cramps that are debilitating warrant further investigation.
Why does it take so long to diagnose endometriosis?
The delay is due to a combination of factors: the cultural normalization of menstrual pain, the overlap of symptoms with complaints considered common, the limitations of routine tests in detecting early forms of the disease, and, in some cases, approaches that treat the symptom without investigating the cause. The average time between the onset of symptoms and diagnosis is approximately 7 years.
Is there a cure for endometriosis?
Endometriosis is a chronic condition that can be managed, but for which there is currently no definitive cure. Treatment varies depending on the severity of the condition and the patient’s goals, and may include medication, hormone therapy, or surgery. Ongoing medical care is essential for maintaining quality of life.
Does endometriosis cause infertility?
Endometriosis is one of the leading causes of difficulty conceiving. It is estimated that between 30% and 50% of women with the condition experience some degree of impaired fertility. However, having endometriosis does not mean it is impossible to become pregnant. With proper care, many women are able to conceive naturally or with the help of assisted reproductive technologies.