Early Signs of Endometriosis: Warning Signs Every Woman Should Know

Painful periods are common. But painful periods that stop you from working, studying, or simply living your life are not normal – and they should never be dismissed as something you just have to push through.

Endometriosis affects approximately 1 in 7 Australian women, yet in Australia, the average time from first symptoms to a diagnosis is still around 6 to 8 years. That gap exists largely because the early signs of endometriosis are so frequently normalised, misattributed, or overlooked by patients, and sometimes by doctors.

In many clinical consultations, women share that they had lived with these symptoms for years before realising they might be signs of endometriosis.

If your body has been trying to tell you something, this is where you start listening. This article walks you through the early endometriosis symptoms to be aware of, why they are so commonly missed, and what to do if you recognise them in yourself.

Early Endometriosis Symptoms: What to Look For

The early signs of endometriosis are not always dramatic. Many women describe their early symptoms as things they had accepted as part of their cycle, until they learned that other women were not experiencing the same thing.

Here are the most important early endometriosis symptoms to know:

• • Painful periods that go beyond normal discomfort 
    The most recognised endometriosis warning sign. If your period pain is severe enough to take time off work or school, if standard pain relief does not help, or if the pain begins days before your period and continues after it ends, this is not a normal level of discomfort. It warrants investigation.
    

    If your blood smells metallic during your period, this is not a sign of endometriosis. This is a common concern we hear from patients, but the two are unrelated.
    
    Why blood smells metallic during your period: Blood smells metallic simply because of the iron it contains. When blood is exposed to air, the iron oxidizes and produces that characteristic scent. This is completely normal and has nothing to do with any underlying condition.

  • Chronic pelvic pain outside of your period

    Early endometriosis can cause a persistent, low-grade aching in the pelvis completely unconnected to your menstrual cycle. Many women describe it as a dull pressure or heaviness that comes and goes – if you think “my uterus hurts when I press on it”, this is a tell-tell sign to look for: pelvic pain on non-menstruating days is a significant early warning sign.

• • Pain during or after sex

    Dyspareunia, or pain during or after sexual intercourse is one of the most underreported early signs of endometriosis. Many women do not raise it out of embarrassment, or assume it is normal. It is not. Deep pelvic pain during sex is a well-documented early symptom.

  • Painful bowel movements or urination around your period
    If going to the toilet becomes significantly more painful around the time of your period – particularly accompanied by bloating, constipation, or diarrhoea,  this can be an early sign that endometriosis is affecting tissue near the bowel or bladder. In more advanced cases, endometriosis lesions may involve nearby organs, which is discussed in medical guides on deep infiltrating endometriosis affecting the bowel and bladder.

  • Spotting or bleeding between periods
    Irregular bleeding outside your normal cycle, including light spotting in the days before your period officially begins, can be an early endometriosis warning sign, particularly when it occurs alongside other symptoms on this list.

  • Unexplained fatigue
    Fatigue that feels disproportionate to your activity level, particularly around your period, is a commonly overlooked early sign of endometriosis. The chronic inflammation the condition creates places a real burden on the body – exhaustion is often one of the first ways that burden shows up.
  • Significant bloating
    Often called ‘endo belly’ by women who experience it, severe abdominal bloating – particularly around menstruation, is a frequently reported early symptom. When it is cyclical and severe, it deserves clinical attention rather than dismissal as normal PMS.

Experiencing more than one or two of these symptoms, particularly if they are cyclical or worsening over time, is a strong reason to seek a specialist opinion rather than continuing to manage them alone.

What Is Endometriosis?

Endometriosis is a long-term condition where tissue similar to the lining of the uterus grows outside the uterus, most often on the ovaries, fallopian tubes, and pelvic lining. Each month, this tissue responds to hormonal changes just as the uterine lining does. It thickens, bleeds, and inflames, but with nowhere to exit the body.

The result is chronic inflammation, progressive scarring, and significant pain. What makes endometriosis particularly difficult to catch early is that its symptoms closely mirror other common conditions, and many of its hallmarks have historically been dismissed as a normal part of being a woman.

They are not.

Why Are Early Endometriosis Symptoms So Often Missed?

Understanding why early signs of endometriosis are so frequently overlooked matters – both for women seeking answers and for the broader conversation about women’s health.

There are three primary reasons:

• Normalisation of period pain
  Women are still routinely told that painful periods are part of life. While some discomfort during menstruation is common, debilitating pain is not – and the difference requires a clinical conversation, not dismissal.

• Symptom overlap with other conditions
  Early endometriosis symptoms closely resemble those of irritable bowel syndrome, pelvic inflammatory disease, and polycystic ovary syndrome. Without specialist assessment, these conditions are frequently diagnosed instead of endometriosis, adding years to the diagnostic delay.

• No visible external signs
  Unlike many conditions, endometriosis cannot be seen from the outside. Routine blood tests are often normal. A standard ultrasound may show nothing. This leads many women and some doctors to conclude nothing is wrong, when the disease may already be progressing silently.

This is why women who recognise these warning signs need to advocate clearly for themselves, and why seeing a specialist with specific endometriosis experience makes a significant difference.

What is the most mysterious symptom of endometriosis?

One of the most puzzling aspects of endometriosis is how little pain correlates with disease severity. Some patients with extensive endometriosis experience minimal discomfort, while others with mild cases suffer debilitating pain. Doctors still don’t fully understand why, making diagnosis and treatment deeply personal and often frustrating for patients.

When Do Early Endometriosis Symptoms Typically Begin?

Endometriosis symptoms most commonly begin in adolescence, and research shows they often start in the first few years after a girl’s first period (and sometimes even with the very first periods). Because period pain in teenagers is so routinely dismissed, many women do not connect their symptoms to a potential diagnosis until their twenties or thirties.

This matters because endometriosis is a progressive condition in many women. The earlier it is identified and managed, the better the long-term outcomes – for both pain relief and fertility. If you have experienced these symptoms since your teenage years and never received a satisfying explanation, raising endometriosis specifically at your next appointment is an important step.

For a full breakdown of how endometriosis progresses, how it is diagnosed, and what treatment looks like at every stage, read our complete endometriosis guide.

Can a colonoscopy detect endometriosis?

No. A colonoscopy examines the inside of the colon and cannot detect endometriosis. The only way to definitively diagnose endometriosis is through laparoscopy, a minor surgical procedure.

Are you born with endometriosis?

Not exactly. You are not born with endometriosis itself, but you may be born with a genetic predisposition to developing it. It typically develops after menstruation begins and is influenced by hormones, particularly estrogen.

Can children get endometriosis?

Yes. Endometriosis can develop in adolescents shortly after their first period begins. It is often missed or dismissed in younger patients, as severe period pain in teens is frequently written off as normal. Early diagnosis is important to prevent progression.

Early Endometriosis Symptoms and Your Fertility

One of the most important reasons to take early endometriosis symptoms seriously is the condition’s relationship with fertility. Endometriosis is found in up to about half of women who are investigated for difficulty getting pregnant, according to large international reviews.

The earlier endometriosis is identified, the more options are available – including fertility preservation, surgical management before significant scarring develops, and early access to specialist fertility support if and when it is needed.

If you are experiencing early endometriosis warning signs and are thinking about your future fertility – even if you are not planning to conceive for years – a specialist assessment now gives you the most options later.

What to Do If You Recognise These Early Warning Signs

If you have read through this list and found yourself nodding along to more than one or two symptoms, the most important thing you can do is stop normalising what you are experiencing and seek a specialist opinion.

Here are your next steps:

Track your symptoms

Before your appointment, keep a symptom diary for one to two full cycles. Note the timing, location, and severity of pain, any irregular bleeding, fatigue levels, and how each symptom relates to your cycle. This information is invaluable to a specialist and significantly shortens the time to diagnosis.

Be specific with your doctor

Do not soften your symptoms. If your pain is an 8 out of 10, say so. If it stops you from working or studying, say so. The more precisely you describe your experience, the easier it is for your doctor to act. Vague descriptions of ‘bad periods’ are too easy to dismiss.

Ask for a referral to an endometriosis specialist

A GP is a starting point, but endometriosis requires specialist assessment. Ask specifically for a referral to a gynaecologist with experience in endometriosis, or book directly with a specialist endometriosis clinic in Melbourne. Early specialist involvement consistently leads to faster diagnosis and better outcomes.

Frequently Asked Questions: Early Signs of Endometriosis