Is endometriosis contagious? No. You cannot catch endometriosis from another person through sex, physical contact, kissing, living together, or sharing everyday spaces. Endometriosis is not an infection and is not a sexually transmitted infection (STI). It is a chronic condition in which tissue similar to the lining of the uterus grows outside the uterus and can cause inflammation, pain, scarring, and fertility problems.

That sounds straightforward, so why does this question come up so often?

Usually, it is because the word “spread” creates confusion. Endometriosis can affect different areas within the body, and it can also appear in several members of the same family. Neither situation means that one person has transmitted the disease to another.

Let’s separate the facts from the confusion.

Is Endometriosis Contagious?

No. Endometriosis is not contagious.

Planned Parenthood gives the answer very directly: “No. Endometriosis is not contagious.”

This means you cannot develop endometriosis because you spent time with someone who has it. You cannot catch it from a partner, friend, family member, coworker, or anyone else.

Endometriosis happens because tissue similar to endometrium develops or persists outside the uterus. It commonly affects areas such as the ovaries, fallopian tubes, pelvic lining, bowel, and bladder. These lesions can respond to hormonal changes, contributing to inflammation, pain, scar tissue, and adhesions.

Think of it this way: a contagious illness is something that can be transmitted from one host to another, usually through an infectious agent or another defined route of transmission. Endometriosis does not work that way.

University College London Hospitals NHS Foundation Trust puts it even more clearly, describing endometriosis as “not an infection, not contagious and not cancer.”

There is no reason to avoid someone with endometriosis out of fear of catching the disease.

Can You Catch Endometriosis Through Sex or Physical Contact?

This is one of the most common misunderstandings surrounding the condition.

The answer remains no. Endometriosis cannot be transmitted through ordinary physical contact or sexual activity.

Can You Get Endometriosis From Sex?

No. Having sex with someone who has endometriosis does not cause you to develop endometriosis.

This point matters because endometriosis itself can cause pain during or after sexual intercourse. NHS and specialist medical sources list painful sex as a recognized symptom of endometriosis.

That creates an unfortunate confusion:

Endometriosis can affect sex, but sex does not transmit endometriosis.

For someone living with the condition, deep pelvic lesions, inflammation, adhesions, or tenderness around pelvic structures may make intercourse painful. The pain may be mild for one person and severe for another. Disease severity and pain do not always correspond neatly; some people with limited visible disease experience substantial pain, while others with more extensive disease have few symptoms.

Can My Partner Catch Endometriosis?

No. Your partner cannot “catch” endometriosis from you.

You can continue to live together, sleep in the same bed, hug, kiss, have sex, share a bathroom, and maintain a normal relationship without transmitting endometriosis.

What your partner can experience is the impact that endometriosis has on your life and relationship. Pain during intercourse, chronic pelvic pain, fatigue, and fertility difficulties can affect intimacy and emotional well-being. WHO recognizes that endometriosis can affect sexual health and relationships.

In other words, the condition can have a shared impact, but it is not a shared infection.

Is Endometriosis an STI or an Infection?

No. Endometriosis is neither an STI nor an infectious disease.

An STI is caused by an infectious organism such as a bacterium, virus, or parasite and can be transmitted between people through specified routes. Endometriosis is different. It is a chronic inflammatory gynecological condition involving endometrium-like tissue outside the uterus.

This distinction becomes especially important because some symptoms can overlap with other conditions.

For example, pelvic pain, pain during sex, abnormal bleeding, or urinary discomfort can have several possible explanations. Pelvic inflammatory disease, certain infections, ovarian cysts, fibroids, adenomyosis, and gastrointestinal conditions can also cause pelvic symptoms. Mayo Clinic notes that endometriosis can sometimes resemble pelvic inflammatory disease, ovarian cysts, or irritable bowel syndrome.

So, having pelvic pain does not automatically mean you have endometriosis, and having symptoms associated with endometriosis does not mean an infection has been transmitted.

Why Does Endometriosis Run in Families?

This is where the contagious question gets more interesting.

Perhaps your mother has endometriosis. Then a sister is diagnosed. Maybe another relative has experienced severe period pain or fertility problems.

Does that mean someone passed the condition to them?

No.

Family clustering is better understood in terms of susceptibility, not transmission.

Is Endometriosis Hereditary?

Research indicates that family history is associated with an increased likelihood of endometriosis. NICE specifically recommends asking whether a person’s first-degree relatives have a history of endometriosis because this increases the likelihood of the condition.

Mayo Clinic also identifies having a close relative with endometriosis, such as a mother or sister, as a risk factor.

But there is an important distinction:

Increased genetic susceptibility does not mean endometriosis is directly inherited in a simple one-gene, one-disease pattern.

Scientists believe endometriosis involves multiple interacting factors. Genetic predisposition may be one part of the picture, alongside hormonal, immune, developmental, and other biological mechanisms. The exact cause remains uncertain.

Familial Risk Does Not Mean Contagious

Imagine several members of a family having a condition because they share certain biological characteristics. That is very different from one person infecting another.

Think of it like the difference between inheritance and transmission.

Inherited or familial susceptibility may increase someone’s chance of developing a condition. Contagious diseases, by contrast, are transmitted between people.

That is why two sisters can both have endometriosis without either one “catching” it from the other.

Can Endometriosis Spread Inside the Body?

This is another phrase that causes confusion.

You may hear that endometriosis can “spread.” In a medical context, this can refer to lesions occurring in different areas of the body or to disease becoming more extensive over time. It does not mean that one person can transmit endometriosis to another person.

Endometriosis most often affects the pelvis, but WHO notes that it can also occur elsewhere in the body, including the abdomen and chest.

Within the pelvis, endometriosis may involve the ovaries, pelvic peritoneum, bowel, bladder, or other nearby structures. Adhesions and scarring can distort pelvic anatomy and may contribute to pain or fertility problems.

So there are two completely different concepts:

Internal distribution: disease involving multiple anatomical sites within the same person.

Person-to-person transmission: one individual giving the disease to someone else.

Endometriosis can involve the first. It does not behave like the second.

What Causes Endometriosis?

Here is where medicine still has some unanswered questions.

WHO states that the causes of endometriosis are unknown. Current evidence suggests that the condition is complex rather than having one single cause.

Several theories have been investigated, including retrograde menstruation, changes involving peritoneal cells, immune-system dysfunction, developmental factors, and the movement or implantation of endometrial-like cells. These mechanisms may explain some cases, but no single theory completely explains every person with endometriosis.

That uncertainty is important.

It means we should be cautious when anyone claims that there is one proven reason why every person develops endometriosis. There is currently no evidence that it develops because someone was exposed to another person with the disease.

What Symptoms Can Endometriosis Cause?

Although the question “is endometriosis contagious?” is about transmission, the more important issue is often whether your symptoms could point toward endometriosis.

Possible symptoms include:

• Severe or painful periods
• Chronic pelvic pain
• Pain during or after sex
• Lower abdominal or back pain
• Pain with bowel movements
• Pain when urinating
• Heavy menstrual bleeding
• Fatigue
• Bloating or nausea
• Difficulty becoming pregnant

Not everyone experiences the same symptoms, and some people have few or no obvious symptoms.

NICE recommends considering endometriosis in people with symptoms such as chronic pelvic pain, period-related pain that affects daily life, deep pain during or after sex, cyclical gastrointestinal or urinary symptoms, and infertility when associated with these symptoms.

That is why the focus should not stop at the question, “Can I catch it?”

A more useful question may be:

“Could my symptoms be caused by endometriosis, and do I need an evaluation?”

When Should You See an Endometriosis Specialist?

You do not need to worry about passing endometriosis to someone else. But persistent symptoms deserve attention.

Consider speaking with a gynecologist or endometriosis specialist when pelvic pain repeatedly interferes with your work, exercise, sleep, relationships, or everyday activities. The same applies when you have severe period pain, painful sex, bowel or urinary symptoms linked to your cycle, an ovarian endometrioma, or fertility concerns. NICE recommends specialist care pathways for suspected or confirmed endometriosis in situations including endometrioma and suspected deep endometriosis.

Diagnosis may involve a detailed symptom and menstrual history, pelvic examination, ultrasound, MRI, and sometimes laparoscopy depending on the clinical situation. Surgery is not necessarily required before treatment is started.

For patients seeking specialist evaluation in Spain, Dr. Lucas Minig’s practice in Valencia focuses on complex gynecological conditions, including endometriosis, with individualized treatment planning and minimally invasive laparoscopic or robotic surgery when appropriate. The practice also provides options for international patients, including virtual consultations.

The right treatment depends on the person’s symptoms, disease characteristics, fertility plans, previous treatment, and overall goals. In complex cases, multidisciplinary care may also be useful.

Conclusion

So, is endometriosis contagious? Absolutely not. You cannot catch endometriosis from sex, kissing, touching, living with someone, sharing a bathroom, or any other ordinary form of physical contact. It is not an infection and it is not an STI.

Endometriosis can, however, occur in several areas of the same person’s body, and having a close relative with the condition can increase the likelihood of developing it. Those facts sometimes make endometriosis sound as though it “spreads” or passes between people, but they describe very different biological processes.

If you are asking because you have pelvic pain, painful periods, painful sex, bowel or urinary symptoms, or fertility difficulties, the more important step is getting the symptoms properly assessed. Endometriosis is complex, but appropriate evaluation and individualized management can make a meaningful difference.

FAQs About Endometriosis and Contagion

1. Can I get endometriosis from my boyfriend or husband?

No. Endometriosis cannot be transmitted from a sexual partner. It is not an STI and does not spread through sexual contact. However, endometriosis can cause pain during sex, so it can still have a major effect on a couple’s intimacy and relationship.

2. Can endometriosis be passed from mother to daughter?

Endometriosis is not passed from mother to daughter like a contagious infection. However, having a first-degree relative with endometriosis is associated with a higher likelihood of developing the condition, suggesting that familial or genetic susceptibility plays a role.

3. Can endometriosis spread to another person through menstrual blood?

No. There is no established person-to-person transmission of endometriosis through menstrual blood. Endometriosis may involve different tissues within the same person’s body, but this is not the same thing as transmitting a disease to another individual.

4. Is endometriosis caused by an infection?

No. Endometriosis itself is not an infection. Medical organizations describe it as a chronic disease involving endometrium-like tissue outside the uterus. Some infections can cause symptoms that resemble endometriosis, however, which is one reason a proper medical evaluation matters.

5. Should I avoid sex if I have endometriosis because it could spread the disease?

No. You do not need to avoid sex because of contagion. Endometriosis cannot be passed to your partner. The issue is comfort: if intercourse causes deep pelvic pain, it may be worth discussing symptoms with a healthcare professional so the underlying cause and appropriate management can be addressed.