Endometriosis is a chronic, inflammatory condition where tissue that looks and behaves like the lining of the uterus grows outside the uterus. These growths are sometimes called endometrial like tissue or implants. They can irritate nearby structures, drive inflammation, and lead to scarring and adhesions over time.
Endometrial like tissue outside the uterus can still respond to hormonal changes across the menstrual cycle. This helps explain why pain is often cyclical at first, then can become persistent. Endometriosis is often described as estrogen dependent and associated with progesterone resistance, meaning progesterone signalling does not work as effectively in the tissue. This imbalance can contribute to ongoing inflammation and pain.
Endometriosis affects an estimated 10 percent of reproductive age women worldwide, which is often described as about 1 in 10. Typically it occurs in women between the age of 25-29 years old. One of the biggest issues is delay.
Where endometriosis can be found
Most commonly, endometriosis is found in the pelvis, including on the ovaries, fallopian tubes, pelvic lining, and supporting ligaments. It can also involve the bowel and bladder. In some cases it occurs outside the pelvis, including the abdomen and even the chest.
How it gets to different sites is still being studied. The best known explanation is Sampson’s theory, also called retrograde menstruation, where menstrual blood containing viable cells flows backward through the fallopian tubes into the pelvic cavity and implants there. This theory does not explain every case, which is why other mechanisms are also discussed in the scientific literature.
Symptoms: more than “bad periods”
Symptoms vary a lot. Some people have severe pain with minimal disease, while others have more extensive disease with fewer symptoms.
Common symptoms include:
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Painful periods or worsening cramps
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Chronic pelvic pain that may continue outside of menstruation
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Pain with sex, especially deep pain
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Pain with bowel movements or urination, often worse around the period
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Bloating, constipation, diarrhoea, nausea, or gut type symptoms
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Fatigue
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Heavy menstrual bleeding
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Infertility or difficulty conceiving
Many people describe pain that is cyclical, progressive, and then becomes chronic.
Risk factors
Risk is higher in people with:
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A first degree relative with endometriosis
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Early menarche
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Shorter cycles and longer or heavier menstrual flow
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Prolonged exposure to estrogen across the lifespan, such as more frequent bleeding over time
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Lower body weight in some studies
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Infertility or delayed childbearing
- Null Parity
Factors associated with lower risk
Some factors are associated with a lower likelihood of diagnosis in population studies, including:
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Parity
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Higher BMI in some studies
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Exercise and physical activity
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Smoking has been reported as negatively associated in some studies, but it is not a health recommendation given the serious harms of smoking
Why diagnosis is often delayed
Many studies report an average diagnostic delay of several years, often cited in the range of about 4 to 11 years, with many people reporting 7 to 10 years from symptom onset to confirmed diagnosis. Moreover one main issue is that there is no single blood test or biomarker that reliably confirms endometriosis in routine care. That reality, combined with symptom overlap with other conditions, contributes to delay.
A good assessment includes a detailed history of pain patterns, bleeding, bowel and bladder symptoms, impact on daily function, and fertility history. Pelvic exam may show tenderness, nodules, adnexal masses, or reduced uterine mobility, but a normal pelvic exam does not rule it out.
Imaging and procedures
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Transvaginal ultrasound can identify ovarian endometriomas and can detect many forms of deep infiltrating endometriosis when performed with a structured approach.
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Laparoscopy with visualisation, ideally with histology, has long been considered the diagnostic gold standard, but it is invasive. Many guidelines now support making a clinical and imaging based diagnosis to start treatment sooner, with laparoscopy reserved for specific situations.
Differential diagnosis: what else can look like endometriosis
Because the symptoms can mimic other issues, clinicians often consider several possibilities. Common differentials include:
- Adenomyosis: Often heavy bleeding and painful periods, sometimes a tender enlarged uterus.
- Uterine fibroids: Heavy bleeding, pelvic pressure, bulk symptoms, sometimes pain.
- Ovarian cysts or ovarian torsion: More acute pain patterns in torsion, cyst rupture can cause sudden pain.
- Pelvic inflammatory disease: Pelvic pain with infection features, cervical motion tenderness, discharge, fever.
- Irritable bowel syndrome: Abdominal pain with bowel habit changes, can flare with stress and diet.
- Inflammatory bowel disease: Persistent diarrhea, blood in stool, weight loss, systemic symptoms.
- Interstitial cystitis or bladder pain syndrome: Bladder pain, urinary frequency and urgency, pain that worsens with bladder filling.
- Pelvic floor dysfunction: Pain with intercourse, urinary and bowel symptoms, muscle spasm and tenderness.
- Ectopic pregnancy in reproductive age patients with pain and bleeding. This is a medical emergency.
If symptoms are severe, worsening, or impacting work, school, sleep, or relationships, it is worth being assessed. If there is fainting, fever, sudden severe pain, heavy bleeding, or pregnancy risk, seek urgent care.
Natural ways to support your body with endometriosis
Natural approaches can be helpful as adjuncts. The goal is to support inflammation balance, gut function, and hormone metabolism, while improving pain and quality of life.
1) Anti-Inflammatory Diet
Because endometriosis is inflammatory, many people focus on dietary patterns that reduce inflammatory load and support stable blood sugar and gut health.
A useful starting point is a Mediterranean style, whole food pattern, which has been associated with less pain and better symptom control in observational work, and is consistently supported as a low inflammatory dietary pattern.
Include the following in your diet:
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Colourful vegetables daily, especially leafy greens and cruciferous vegetables
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Fruit, especially berries and citrus
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Legumes and whole grains if tolerated
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Nuts and seeds are healthy fats
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Extra virgin olive oil as a main fat
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Fish and seafood for omega 3 intake
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Fibre rich foods to support gut health and estrogen metabolism
Consider reducing:
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Red and processed meats, which have been associated with a higher risk of endometriosis in pooled data
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Trans fats and ultra processed foods
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Alcohol, especially if it worsens symptoms or sleep
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A note on gluten, dairy, and caffeine: Some people feel better reducing or avoiding them, but the evidence is mixed and it often depends on individual tolerance and overlapping conditions like IBS. If you trial eliminations, do it in a structured way so your diet stays nutritionally complete.
2) Supplements: what has evidence and how to think about them
Supplements are best chosen based on your symptom pattern, goals, medications, and lab work, if relevant. Some options have early evidence in endometriosis related pain or inflammation, but quality and study size vary.
- Omega 3 fatty acids: Omega 3s may help reduce inflammatory signalling and may improve pain for some people. Evidence is still evolving, but it is one of the more reasonable foundational options when appropriate.
- N acetyl cysteine (NAC): NAC has antioxidant effects and has been studied in endometriosis, including research suggesting improvement in pain and possible reduction in ovarian endometrioma size in some settings. Discuss this with a clinician, especially if you have asthma, take nitroglycerin, or have medication considerations.
- Palmitoylethanolamide (PEA): PEA has been studied for chronic pelvic pain, including endometriosis related pain, with some trials reporting improvements in pain measures and quality of life. It can be a reasonable option to discuss if pain is a dominant feature.
- Curcumin: Curcumin has strong anti inflammatory and antioxidant activity in the literature, with a lot of mechanistic and preclinical data and some emerging human research. It may be helpful for some people, but absorption and formulation matter, and it can interact with anticoagulants and other medications.
- Vitamin D, magnesium, and targeted nutrients: These can support general health and pain sensitivity in some people, but they are best individualised. Vitamin D is best guided by lab values.
- “Liver support” and estrogen modulation supplements: These are popular, but evidence varies by ingredient and quality. If the goal is estrogen metabolism support, the most evidence based foundation is still diet, fibre, alcohol moderation, and gut health support, with supplement choices tailored to your history.
3) Lifestyle supports that matter more than people think
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Movement: regular activity is associated with lower risk and may support pain modulation and stress resilience
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Stress and nervous system support: chronic pain and chronic stress amplify each other
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Sleep: poor sleep increases pain sensitivity and inflammatory signalling
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Pelvic floor physiotherapy: very helpful when pelvic floor overactivity contributes to pain with sex, urination, or bowel movements
When to speak with a healthcare provider:
Talk with a healthcare professional if you have:
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Period pain that causes missed work or school
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Pain with sex, bowel movements, or urination
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Chronic bloating and pelvic discomfort that cycles with your period
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Fertility concerns
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Symptoms that are worsening or not responding to typical pain measures
Endometriosis is real, common, and often missed for years. A clinical diagnosis plus imaging can be enough to start treatment and symptom support in many cases, without waiting for surgery.
