Endometriosis Symptoms and Signs

Endometriosis affects approximately 6% to 10% of women of reproductive age worldwide and is a leading cause of chronic pelvic pain and infertility1 2. The condition involves the growth of tissue similar to the uterine lining outside the uterus, causing a range of symptoms that can severely impact quality of life3 . Diagnosis is often delayed by several years due to symptom variability and normalization of menstrual pain4 5. Understanding the common symptoms and signs is essential for timely evaluation and management3 .

Pelvic Pain and Cramping

Pelvic pain is the hallmark symptom of endometriosis and can be severe and debilitating1 . This pain often begins before menstruation and may persist for several days into the period6 . Women describe the pain variably as sharp, burning, or throbbing, and it may radiate to the lower back, abdomen, or legs6 7.

Common types of pain associated with endometriosis include:

• Dysmenorrhea: Painful menstruation that is more intense than typical menstrual cramps and can interfere with daily activities6 7.
• Chronic pelvic pain: Persistent pain in the pelvic region that may occur throughout the menstrual cycle1 7.
• Dyspareunia: Pain during or after sexual intercourse, often due to inflammation and scar tissue in the pelvic area6 .
• Pain with urination or defecation: Endometriosis can cause urinary symptoms and dyschezia (painful bowel movements), especially during menstruation8 .
• Radiating pain: Pain may extend to the lower back or legs, reflecting involvement of pelvic nerves6 .

Inflammation caused by endometrial-like tissue outside the uterus leads to irritation and formation of scar tissue (adhesions), which contributes to pain and muscle spasms in the pelvic floor7 3. This pain can significantly limit work, school, and social activities7 .

Endometriosis and Infertility

💡 Did You Know? The hypothesis that endometriosis causes infertility or a decrease in fecundity remains controversial. While there is a strong association between endometriosis and infertility, a direct causal relationship has not been definitively established11 .

Endometriosis is strongly associated with infertility, affecting approximately 30% to 50% of women with the condition2 10. Infertility is clinically defined as the failure to conceive after 12 months of regular, unprotected intercourse8 . The mechanisms by which endometriosis impairs fertility include:

• Pelvic adhesions: Scar tissue can distort pelvic anatomy, impairing ovulation and the pickup of eggs by the fallopian tubes2 .
• Tubal damage: Scarring and blockage of the fallopian tubes can prevent sperm and egg from meeting2 .
• Inflammation: Pelvic inflammation may interfere with embryo implantation in the uterus2 .
• Ovarian reserve and oocyte quality: Endometriosis can negatively affect the number and quality of eggs2 .

Despite these challenges, many women with mild to moderate endometriosis can conceive naturally or with assisted reproductive technologies10 . Early diagnosis and treatment of endometriosis-related infertility can improve pregnancy outcomes2 .

“Endometriosis is a common cause of infertility. This can happen if the endometrial tissue implants around the ovaries or fallopian tubes, where it can also cause inflammation and scar tissue.”

— John Petrozza, MD, Massachusetts General Hospital10

Menstrual Cycle Changes

Endometriosis can cause notable changes in the menstrual cycle, including:

• Shortened menstrual cycles: Increased frequency of menstruation with cycles shorter than the typical 21 to 35 days1 .
• Prolonged bleeding: Menstrual bleeding lasting longer than seven days has been reported1 .
• Heavy menstrual bleeding (menorrhagia): Excessive menstrual flow is sometimes observed in women with endometriosis12 .
• Intermenstrual spotting: Bleeding or spotting between periods is a recognized symptom1 .

These menstrual irregularities are caused by the abnormal growth and shedding of endometrial-like tissue outside the uterus, which responds to hormonal changes during the cycle1 . The resulting inflammation and irritation can exacerbate bleeding and cramping6 .

Gastrointestinal Symptoms

Gastrointestinal (GI) symptoms are common in endometriosis and often overlap with irritable bowel syndrome (IBS), complicating diagnosis13 . Women with endometriosis report a higher prevalence of GI complaints compared to unaffected individuals13 . Common GI symptoms include:

• Abdominal pain and cramping13
• Bloating and distension13
• Diarrhea, constipation, or alternating bowel habits13
• Nausea and vomiting, especially around menstruation13

The overlap with IBS is significant, with endometriosis patients having about a threefold increased risk of IBS13 . This overlap can lead to misdiagnosis and delayed treatment13 . The pathophysiological connection between endometriosis and IBS remains under investigation13 .

Endometriosis lesions can also involve the bowel and bladder, causing pain during bowel movements or urination, and sometimes blood in the stool or urine8 14.

Chronic Fatigue

Fatigue is a frequent but often underrecognized symptom of endometriosis. Chronic inflammation and immune activation contribute to systemic fatigue, which is distinct from normal tiredness2 15. The burden of chronic pain and illness further exacerbates fatigue, negatively impacting mood, relationships, and productivity15 .

Fatigue in endometriosis is persistent and debilitating, often described as a lack of energy that interferes with daily activities15 . Addressing fatigue is an important component of comprehensive endometriosis care15 .

When to See a Doctor

Women experiencing severe menstrual pain that interferes with daily activities should seek medical evaluation6 . Other signs warranting a healthcare visit include:

• Chronic pelvic pain beyond normal menstrual cramps7
• Pain during intercourse or bowel movements6 8
• Menstrual irregularities such as heavy bleeding or prolonged periods1
• Gastrointestinal symptoms that worsen around menstruation13
• Difficulty conceiving after 12 months of trying8

Early diagnosis and treatment improve outcomes and quality of life16 . Definitive diagnosis requires laparoscopy with histological confirmation, but clinical evaluation and imaging can guide initial management1 16.

“The degree of pain can be far worse than what any woman should expect with her monthly period, especially since it is a progressive disease, meaning that scar tissue accumulates and the pain worsens over time.”

— Hugh Taylor, MD, Yale Medicine17

Endometriosis Symptoms Summary

Endometriosis symptoms vary widely among individuals. Some women experience severe pain with minimal visible disease, while others have extensive lesions with few symptoms1 3. Symptoms often worsen over time and can affect multiple organ systems beyond the pelvis18 17. Recognizing the broad spectrum of symptoms is key to timely diagnosis and effective management3 .