When does endometriosis start? There is no single age that applies to everyone. Endometriosis can occur after menstruation begins, including during the teenage years, yet many people are not diagnosed until much later.

The World Health Organization (WHO) states that endometriosis can affect people “from the onset of their first period (menarche) through menopause.” 

So, can you have endometriosis as a teenager? Yes. Can you be diagnosed in your 30s or 40s? Yes. But the age of diagnosis does not necessarily tell you when the disease actually started.

When Does Endometriosis Start?

Medically, “starting” refers to when endometriosis develops, while diagnosis is when the condition is identified through symptoms, imaging or, in some cases, surgery. These two events can happen years apart.

The exact cause of endometriosis remains unknown. Researchers are studying hormonal, genetic, immune, developmental and environmental factors that may contribute to its development. (WHO)

This means there is no test that can usually tell you exactly when your endometriosis began.

What Age Does Endometriosis Start?

Endometriosis can occur after menstruation begins, including during adolescence. Research increasingly recognizes it as a condition that can affect teenagers as well as adults.

A 2024 review noted that endometriosis often begins during adolescence, while NICE recommends considering the condition in young people whose pelvic or period pain affects their daily lives. 

Can Endometriosis Start During the Teenage Years?

Yes. A teenager can have endometriosis after her first periods begin. Severe or persistent symptoms should not automatically be dismissed as “normal period pain.”

NICE recommends considering endometriosis in adolescents with chronic pelvic pain or period-related pain that affects quality of life.

Severe Period Pain in Teens: When Is It Not “Normal”?

Some menstrual discomfort is common, but pain that regularly causes a teenager to miss school, stop activities, stay in bed or rely heavily on medication deserves medical attention.

Other warning signs include pelvic pain between periods, painful bowel movements, cyclical constipation or diarrhea, urinary symptoms and pain during sex.

The goal is not to assume every painful period is endometriosis. It is to make sure significant symptoms are properly assessed.

Can Endometriosis Occur at Any Age?

Endometriosis is mainly associated with the reproductive years, but it can occur from menarche through menopause. Symptoms and the age of diagnosis can vary significantly from one person to another.

WHO describes endometriosis as a condition that can affect people “from the onset of their first period (menarche) through menopause.” 

A teenager may mainly experience severe menstrual pain, while another woman may first seek help for chronic pelvic pain or difficulty becoming pregnant.

The condition can look different at different stages of life, which is one reason it can be difficult to recognize.

Can You Develop Endometriosis Later in Life?

A diagnosis later in life is certainly possible, but being diagnosed later does not necessarily mean the disease first developed then.

Symptoms may have been present for years but attributed to painful periods, digestive problems or other gynecological conditions.

Can You Develop Endometriosis in Your 30s?

Yes. Endometriosis is commonly diagnosed in women in their 30s. ACOG states that it affects about 1 in 10 women of reproductive age and is “most often diagnosed in women in their 30s and 40s.”

However, a diagnosis at 32 or 35 does not prove that endometriosis started at that age. Long-standing symptoms may have gone unrecognized earlier.

Can You Develop Endometriosis in Your 40s?

Yes, endometriosis can also be diagnosed in your 40s. But new pelvic symptoms should be evaluated carefully because conditions such as fibroids, adenomyosis, ovarian cysts and perimenopause can produce similar symptoms.

A later diagnosis may represent disease that has been present for years rather than a condition that suddenly started at 40.

Are You Born With Endometriosis?

There is not enough evidence to say that most people are literally born with established endometriosis. Researchers are investigating genetic, developmental and early-life factors that may influence very early-onset disease.

WHO states that “The causes of endometriosis are unknown.” 

Research has explored possible links between neonatal uterine bleeding and early-onset endometriosis, but this remains an area of scientific investigation rather than proof that endometriosis is routinely present at birth.

So, are you born with endometriosis? We do not currently have enough evidence to say that you are.

Why Is Endometriosis Often Diagnosed Years After It Starts?

Endometriosis can take years to recognize because symptoms overlap with other conditions and severe period pain is sometimes normalized.

WHO reports that the time to diagnosis can range from approximately 4 to 12 years. 

Pain may be attributed to normal menstruation, irritable bowel syndrome, ovarian cysts or other conditions. Some people also become accustomed to monthly pain and stop questioning whether it is normal.

Symptoms can change over time too. What begins as painful periods may later involve chronic pelvic pain, painful sex, bowel symptoms or fertility difficulties.

That is why the age of diagnosis is not necessarily the age when endometriosis started.

What Are the Early Signs of Endometriosis?

The early signs of endometriosis vary, but persistent menstrual pain, pelvic pain, painful sex, bowel or bladder symptoms and fertility problems are important warning signs.

Common symptoms include:

• Severe menstrual pain: Pain that is intense, worsening or interferes with everyday life.
• Chronic pelvic pain: Pain that continues outside the menstrual period.
• Pain during sex: Particularly deep pelvic pain during or after intercourse.
• Bowel symptoms: Painful bowel movements, constipation, diarrhea or cyclical digestive symptoms.
• Bladder symptoms: Urinary pain or symptoms that follow the menstrual cycle.
• Fertility difficulties: Endometriosis may affect fertility through ovarian, tubal or pelvic factors.

WHO recognizes severe period pain, chronic pelvic pain, infertility, painful intercourse and bowel or urinary symptoms among the possible manifestations of endometriosis. 

Can You Prevent Endometriosis From Starting?

There is currently no proven way to prevent endometriosis completely. The most useful approach is recognizing symptoms early, getting appropriate medical advice and maintaining overall health.

WHO states that “there is no known way to prevent endometriosis.” 

Similarly, the ESHRE guideline found no direct evidence that a specific intervention can reliably prevent future endometriosis. 

Healthy eating and regular physical activity may support general well-being and symptom management, but they should not be promoted as guaranteed prevention.

So, how can you prevent endometriosis? At present, you cannot reliably stop it from developing. What you can do is recognize unusual symptoms and seek care early.

When Should You See a Specialist for Possible Endometriosis?

You should consider specialist evaluation when pelvic or menstrual pain persists, affects daily activities or does not improve with initial treatment.

This is especially important if symptoms interfere with school, work, exercise, relationships or fertility.

Evaluation may include a detailed medical history, examination, ultrasound and, when appropriate, MRI. NICE emphasizes that suspected endometriosis should be assessed based on symptoms and that imaging should be interpreted in the broader clinical context. (NICE)

A normal scan does not automatically rule out endometriosis.

Endometriosis Treatment and Personalized Care With Dr. Lucas Minig

Treatment for endometriosis should be tailored to your symptoms, disease location, severity and reproductive goals. There is no single treatment that is right for every patient.

Dr. Lucas Minig’s practice in Valencia provides personalized endometriosis care, including medical management and minimally invasive treatment for deep or severe disease. The approach may also include supportive care such as nutritional, psychological and pelvic-floor therapies where appropriate. 

For selected patients who require surgery, Dr. Minig offers laparoscopic treatment for conditions such as ovarian endometriomas, deep endometriotic lesions and disease involving the bowel, bladder or ureter, with fertility preservation considered where relevant. 

The important point is that treatment should focus not only on removing disease but also on protecting healthy organs, controlling symptoms and considering future fertility.

Conclusion

So, when does endometriosis start? It can occur after menstruation begins, including during adolescence, and it may continue throughout the reproductive years and into menopause.

You may be diagnosed in your 30s or 40s without the disease necessarily having started then. Endometriosis can remain unnoticed for years, particularly when severe period pain is considered normal.

There is currently no proven way to prevent endometriosis from starting, but recognizing persistent symptoms and seeking appropriate care can help reduce delays in diagnosis and treatment.

Severe period pain is not something you simply have to accept. When symptoms repeatedly disrupt your life, it is worth finding out why.

FAQs

These common questions help clarify the relationship between age, symptoms and endometriosis diagnosis.

1. When does endometriosis usually start?

Endometriosis can occur after menstruation begins, including during adolescence. There is no single age when it starts, and the exact onset cannot usually be identified in an individual patient. (WHO)

2. Can endometriosis start during puberty?

Yes. Endometriosis can affect adolescents after their first periods. Persistent or severe menstrual pain should be evaluated rather than automatically considered normal. (NICE)

3. Can you develop endometriosis in your 30s or 40s?

Yes. Endometriosis is commonly diagnosed in the 30s and 40s, although the disease may have been present for years before diagnosis. (ACOG)

4. Are you born with endometriosis?

Current evidence does not establish that most people are literally born with endometriosis. Researchers continue to investigate developmental and early-life factors involved in early-onset disease. (PubMed)

5. How can you prevent endometriosis?

There is currently no proven method that reliably prevents endometriosis. The best approach is to recognize symptoms early, seek medical evaluation and follow an individualized treatment plan if the condition is diagnosed. (WHO)