Endometriosis is rarely a direct cause of death, but it does carry a measurable increase in premature mortality and creates several pathways through which life-threatening emergencies can develop. A large prospective study following nurses over decades found that women with surgically confirmed endometriosis had roughly a 30 percent higher risk of dying prematurely compared with women without the disease. That elevated risk comes not from the endometrial tissue itself but from a web of downstream consequences: acute internal bleeding, bowel perforation, dangerous pregnancy complications, associated cancers, cardiovascular disease, and the psychiatric toll of living with chronic pain. The question of whether endometriosis can kill you has a more complicated and more sobering answer than most people expect.
What the Mortality Data Actually Show
Two recent studies have tried to quantify the link between endometriosis and dying earlier than expected. The larger of the two, a prospective cohort study published in the BMJ, tracked women in the Nurses’ Health Study II and found that those with laparoscopically confirmed endometriosis had a hazard ratio of 1.31 for premature death after adjusting for behavioral and demographic factors. In practical terms, among women with confirmed endometriosis the death rate was about 2.0 per 1,000 person-years, compared with 1.4 per 1,000 among women without it.1BMJ. Endometriosis and uterine fibroids and risk of premature mortality: prospective cohort study
A separate study using U.S. national survey data (NHANES 1999–2006) found a similar direction but a wrinkle: after fully adjusting for demographics and hormonal factors, the overall association between endometriosis and mortality was no longer statistically significant. However, women diagnosed before age 30 still showed a meaningful increase in mortality risk, with nearly double the hazard compared with women without endometriosis.2PubMed Central. Endometriosis and Mortality Risk in US Women: Findings From NHANES 1999–2006 The difference between the two studies likely reflects their different populations and how endometriosis was confirmed, but the overall message is consistent: the disease is associated with dying younger, and the association appears stronger in women who develop it early in life.
Acute Emergencies That Can Turn Fatal
The most immediately dangerous scenarios in endometriosis involve internal bleeding or bowel complications. Spontaneous hemoperitoneum, where blood suddenly fills the abdominal cavity without trauma, is rare but well-documented. It typically happens when an endometrioma (a blood-filled cyst on the ovary) ruptures or when endometriosis erodes into a blood vessel.3PubMed Central. Endometriosis-induced massive hemoperitoneum misdiagnosed as ruptured ectopic pregnancy: a case report The bleeding can be massive and can mimic a ruptured ectopic pregnancy, which complicates diagnosis in emergency settings.
Endometriosis can also grow into the walls of the intestine and, in extreme cases, cause bowel obstruction or perforation. A retrospective case series found that intestinal endometriosis accounted for over half of the cases in which women of reproductive age presented with acute or subacute bowel obstruction caused by extra-pelvic endometriosis.4PubMed Central. Intestinal endometriosis amongst other extra-pelvic endometriosis foci presenting as acute/subacute bowel obstruction in women of reproductive age: a retrospective case series study Bowel perforation from endometriosis is even rarer but carries the risk of fecal peritonitis, a severe abdominal infection that demands emergency surgery. A case report described a 36-year-old woman whose sigmoid colon perforated at the site of endometriosis, causing exactly that kind of contamination.5PubMed. Large bowel obstruction and perforation secondary to endometriosis complicated by a ventriculoperitoneal shunt
Thoracic endometriosis syndrome is another rare but alarming presentation. When endometrial tissue reaches the chest cavity, it can cause recurrent collapsed lungs (catamenial pneumothorax), bleeding into the chest cavity, or coughing up blood, all of which tend to happen cyclically around menstruation.6PubMed Central. Thoracic Endometriosis Syndrome: A Veritable Pandora’s Box While most episodes are manageable, a large hemothorax or tension pneumothorax without prompt treatment can become life-threatening.
Pregnancy Complications in Women With Endometriosis
Endometriosis is often discussed in terms of infertility, but the risks don’t end once pregnancy is achieved. Women with endometriosis face significantly higher rates of severe maternal morbidity during pregnancy and delivery. One large study found that severe complications occurred in about 46 out of every 1,000 patients with endometriosis, compared with roughly 31 per 1,000 in women without it. When the endometriosis was actively symptomatic during pregnancy, the risk nearly doubled.7PubMed. Association of Endometriosis and Severe Maternal Morbidity
A national-level analysis painted an even sharper picture. It found that pregnant patients with endometriosis had roughly twice the odds of severe maternal morbidity at delivery compared with those without it, with the strongest associations seen for thromboembolism (about five times the odds), sepsis, and emergency hysterectomy.8PubMed. Pregnancy with endometriosis: Assessment of national-level trends, characteristics, and maternal morbidity at delivery Each of those complications can be fatal in its own right.
Spontaneous hemoperitoneum in pregnancy deserves specific mention. When endometriosis implants erode into uterine or ovarian blood vessels during pregnancy, the result can be catastrophic internal bleeding. One case involved a 45-year-old woman in her third trimester whose uterine artery ruptured at the site of an endometriosis implant.9PubMed Central. Endometriosis-Related Spontaneous Hemoperitoneum in the Third Trimester: A Case Report A review of these cases bluntly described spontaneous hemoperitoneum in pregnancy as “an underestimated potentially fatal complication of endometriosis,” noting that while emergency surgery usually saves the mother, fetal outcomes remain poor.10PubMed. Spontaneous hemoperitoneum in pregnancy: A life-threatening maternal and fetal complication of endometriosis
The Cancer Connection
Endometriosis does not transform into cancer in the way people sometimes fear, but it does increase the risk of certain ovarian cancer subtypes. A large pooled analysis of case-control studies found that women with a history of endometriosis were more likely to develop clear-cell ovarian cancer, endometrioid ovarian cancer, and low-grade serous ovarian cancer. The link was not seen with the most common and aggressive subtype, high-grade serous ovarian cancer, or with mucinous ovarian cancer.11PubMed Central. Association between endometriosis and risk of histological subtypes of ovarian cancer: a pooled analysis of case–control studies
A more recent Mendelian randomization study, which uses genetic variants to estimate causal effects, did find a significant association between genetically predicted endometriosis and several ovarian cancer types, including clear-cell carcinoma (about 87 percent higher odds) and endometrioid carcinoma (about 48 percent higher odds). This study also found a modest link with high-grade serous ovarian cancer, which the earlier pooled analysis had not.12PubMed Central. Anatomic subtype-specific causal effects of endometriosis on ovarian cancer: a two-sample Mendelian randomization study The science is still evolving on exactly which subtypes are affected and by how much, but the overall direction is clear: endometriosis raises ovarian cancer risk, particularly for the clear-cell and endometrioid types.
It’s worth keeping perspective. Even with the elevated risk, the absolute chance of any individual woman with endometriosis developing ovarian cancer remains low. Ovarian cancer itself is relatively uncommon. But for a disease affecting an estimated 10 percent of women of reproductive age, even a modest relative increase translates to a meaningful number of additional cases at the population level.
Cardiovascular Disease and Long-Term Risk
Heart disease is the leading cause of death in women overall, and endometriosis appears to nudge that risk higher. Research from the Nurses’ Health Study found that endometriosis was associated with an increased risk of coronary heart disease. Roughly 42 percent of that association could be explained by the fact that women with endometriosis undergo hysterectomy or ovarian removal more frequently and at younger ages, which itself raises cardiovascular risk by removing the protective effects of ovarian hormones.13PubMed Central. Endometriosis and Risk of Coronary Heart Disease The remaining portion of the risk may stem from the chronic systemic inflammation that characterizes endometriosis. This is one of the less dramatic but potentially more impactful pathways by which the disease contributes to premature death, because cardiovascular events are common and endometriosis is too.
Mental Health, Chronic Pain, and Suicide Risk
The psychological burden of endometriosis is severe enough to be a mortality risk in its own right. A large retrospective matched-cohort study found that women with endometriosis were about twice as likely to be diagnosed with self-directed violence (which includes suicidal behavior and self-harm) compared with matched women without the condition. They were also roughly 1.5 times as likely to be diagnosed with depression and 1.4 times as likely to have clinically recognized anxiety. Pain from endometriosis, including painful periods, pain during intercourse, and chronic pelvic pain, was specifically associated with higher rates of all three outcomes.14American Journal of Epidemiology. Depression, Anxiety, and Self-Directed Violence in Women With Endometriosis: A Retrospective Matched-Cohort Study
More recent research confirmed that around 20 percent of women with endometriosis reported suicidal ideation, a rate significantly higher than women without the condition.15PubMed. Stopping suffering: An exploration of suicidal ideation and its clinical, cognitive and relational correlates among women with a diagnosis of endometriosis Chronic pain that is dismissed, minimized, or inadequately treated for years creates a grinding psychological toll. The average diagnostic delay for endometriosis is close to seven years, and the range across countries spans from under two years to over eleven. That is a long time to live with pain that no one has yet explained or properly managed.
Risks From Surgery Itself
Surgery for deeply infiltrating endometriosis, particularly when it involves the bowel, carries its own risks. In a large series of 568 women who underwent surgery for deep endometriosis, the overall rate of major postoperative complications was about 4.6 percent. For women who had rectal surgery specifically, the major complication rate climbed to about 9.3 percent, compared with just 1.5 percent for women whose surgery did not involve the bowel.16PubMed. Complications after surgery for deeply infiltrating pelvic endometriosis Another prospective study of 244 patients found a lower major complication rate of about 1.2 percent overall, with minor complications at around 11 percent.17PubMed. Laparoscopic excision of deeply infiltrating endometriosis: a prospective observational study assessing perioperative complications in 244 patients
The most dangerous surgical complications include anastomotic fistula (where a reconnected bowel segment leaks), which can lead to peritonitis, septic shock, and organ failure. One study documented a case in which a patient developed exactly this cascade: a fistula after bowel resection for endometriosis, followed by septic shock and kidney dysfunction requiring reoperation and intensive care.18Scientific Reports. Clinical outcomes following surgical management of deep infiltrating endometriosis These outcomes are uncommon but not unheard of, and they underscore why surgery for advanced endometriosis is best performed at specialized centers.
Infections and Silent Organ Damage
Endometriomas can become infected, forming abscesses that sometimes rupture and cause peritonitis. This complication occurs in roughly 2.3 percent of patients with endometriomas, usually following invasive procedures or IUD placement, though spontaneous infection also occurs.19PubMed Central. An uncommon case of an infected ovarian endometrioma When an infected endometrioma ruptures into the abdominal cavity, the resulting acute diffuse peritonitis requires emergency surgery.20PubMed Central. Acute Diffuse Peritonitis Due to Spontaneous Rupture of an Infected Endometrioma: A Case Report
Less dramatic but insidious is the damage endometriosis can do to the urinary tract. Ureteral endometriosis, where the disease grows into or around the tube connecting the kidney to the bladder, can slowly obstruct urine flow without causing obvious symptoms. Progressive obstruction leads to hydronephrosis (swelling of the kidney) and, if undetected, permanent loss of kidney function. One case report described this as “silent loss of kidney,” capturing how the damage can happen without the patient ever experiencing pain or visible urinary symptoms.21PubMed Central. Silent loss of kidney secondary to ureteral endometriosis While losing one kidney is not immediately life-threatening, it narrows the margin of safety if the remaining kidney is ever compromised.22PubMed. Ureteral endometriosis and loss of renal function: mechanisms and interpretations
Autoimmune Diseases and Other Comorbidities
The relationship between endometriosis and autoimmune disease adds another layer of long-term health concern. A large case-control study found that patients with endometriosis had roughly double the odds of being diagnosed with at least one autoimmune condition compared with matched controls. The strongest associations were with Sjögren’s syndrome and myositis, with more modest increases seen for rheumatoid arthritis, Hashimoto’s thyroiditis, lupus, multiple sclerosis, and pernicious anemia.23npj Women’s Health. Endometriosis and autoimmunity: a large-scale case-control study of endometriosis and 10 distinct autoimmune diseases
A systematic review and meta-analysis of earlier studies supported these findings, identifying associations between endometriosis and lupus, Sjögren’s syndrome, rheumatoid arthritis, autoimmune thyroid disorders, celiac disease, multiple sclerosis, inflammatory bowel disease, and Addison’s disease. The review cautioned that the quality of evidence was generally low, with only five of 26 included studies providing high-quality data.24Human Reproduction Update. The association between endometriosis and autoimmune diseases: a systematic review and meta-analysis The association likely reflects shared immune dysregulation rather than one disease causing the other, but for patients living with both conditions, the combined burden on daily functioning and overall health is real.
Endometriosis in Unexpected Places
Most people think of endometriosis as a pelvic disease, but it has been documented in nearly every organ system. Endometrial tissue has been found in the liver, diaphragm, lungs, surgical scars, the inguinal canal, and even the brain. A review of these rare extragenital forms noted their “unsuspected frequency” and “extreme variability of presentation,” along with the absence of clear treatment guidelines.25Clinical and Experimental Obstetrics & Gynecology. Rare extragenital endometriosis: pathogenesis and therapy A case report described a patient with no prior history of endometriosis who presented with severe abdominal pain from a 6.5-centimeter cystic mass in the liver that turned out to be hepatic endometriosis.26PubMed Central. Hepatic endometriosis: a rare case and review of the literature
These unusual locations matter for mortality risk because they are easy to miss. A doctor who is not thinking about endometriosis will not find it in the lung, the bowel wall, or the ureter. And when the tissue goes unrecognized, it can cycle and bleed repeatedly, causing progressive scarring and organ damage over months or years before anyone identifies the cause.
How Racial and Socioeconomic Disparities Amplify the Danger
The risks of endometriosis are not evenly distributed. A scoping review of disparities in endometriosis care in the United States found that Black women had higher rates of surgical complications, higher mortality after surgery, and longer perioperative hospital stays compared with all other racial and ethnic groups. White women were more likely to receive minimally invasive surgical approaches, while non-White women were more likely to undergo open abdominal surgery, which carries greater risk of complications. All non-White women faced increased perioperative and postoperative complication rates.27PubMed Central. Disparities in Women With Endometriosis Regarding Access to Care, Diagnosis, Treatment, and Management in the United States: A Scoping Review – Section: Abstract
Diagnostic delay compounds these inequities. Across studies, the average time from symptom onset to diagnosis is close to seven years, with wide variation by country. That delay is not merely an inconvenience. Years of undiagnosed disease mean years during which endometriosis can infiltrate the bowel, obstruct the ureters, or grow into structures where emergency complications become more likely. It also means years of untreated pain, which feeds into the psychiatric risks described above. Every pathway by which endometriosis becomes dangerous gets worse the longer the disease goes unmanaged, and marginalized patients tend to wait the longest.