Have you ever experienced extreme period pain or heavy bleeding and wondered if something more serious could be behind it?
For many women and people with periods, symptoms like severe cramps, fatigue or unusually heavy bleeding are often dismissed as “just part of having a period”. However, these symptoms can sometimes be linked to endometriosis, a chronic condition that affects millions of people worldwide.
Living with endometriosis pain can affect daily life, relationships, work and confidence. Many people also experience worries about fertility, ongoing fatigue and unpredictable symptoms.
In this article we will explore what endometriosis is, the most common symptoms and the possible causes of the condition. We will also look at how it can affect the body over time, including scarring and reproductive health, and what steps you can take if you think you might have endometriosis.
As a brand that works closely with women who experience heavy periods and bladder leaks, we hear regularly from our community about the challenges of living with conditions like endometriosis. Understanding the symptoms is an important first step in getting the support you deserve.
What is Endometriosis?
Endometriosis is a condition where tissue similar to the lining of the uterus grows outside the womb. This tissue can attach to organs such as the ovaries, fallopian tubes, bowel or pelvic lining.
During a normal menstrual cycle, the lining inside the uterus thickens and then sheds during a period. With endometriosis, the tissue outside the uterus also reacts to hormones and can bleed. However, because it has no way to leave the body, it can cause inflammation, swelling and significant pain.
Over time this can lead to:
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Scar tissue and scarring
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Adhesions where organs stick together
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Persistent pelvic pain
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Fertility challenges
Endometriosis affects around 1 in 10 women and people assigned female at birth, yet many people wait years for a diagnosis because symptoms are often mistaken for typical period discomfort.
Common Symptoms of Endometriosis
The symptoms of endometriosis vary from person to person. Some people experience severe symptoms, while others may have very few noticeable signs.
Severe Period Pain
One of the most common symptoms is intense period pain. This is often much stronger than typical menstrual cramps.
People with endometriosis often describe pain that:
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Starts before their period begins
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Continues during and sometimes after their period
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Radiates into the lower back or legs
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Interferes with daily activities
This type of pelvic pain can make work, exercise and even simple daily tasks difficult.
Heavy Menstrual Bleeding
Another common sign is heavy bleeding during periods.
Heavy periods can mean:
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Needing to change period protection very frequently
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Passing large blood clots
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Periods lasting longer than usual
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Bleeding that affects sleep or daily life
For many people, this is one of the most disruptive symptoms. Managing heavy bleeding can impact confidence and comfort, particularly when leaving the house or participating in sport or work activities.
Pain During or After Sex
Pain during intimacy is another symptom linked with endometriosis. This can be due to inflammation or scarring around the pelvic organs.
The pain may feel:
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Deep inside the pelvis
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Sharp or aching
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Worse during certain times of the menstrual cycle
This can affect relationships and emotional wellbeing as well as physical health.
Chronic Pelvic Pain
Some people with endometriosis experience pelvic pain even when they are not on their period.
This can include:
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Ongoing lower abdominal pain
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Lower back pain
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Pain during bowel movements
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Pain when urinating during a period
Because this pain can happen throughout the month, it can be exhausting and difficult to manage.
Digestive and Fatigue Symptoms
Endometriosis can also affect digestion and energy levels.
People may experience:
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Bloating sometimes called “endo belly”
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Nausea
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Constipation or diarrhoea during periods
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Severe fatigue
These symptoms often worsen around the menstrual cycle due to hormonal changes.
Fertility Challenges
Endometriosis can also affect fertility. While many people with the condition can still conceive naturally, the presence of inflammation and scarring around reproductive organs can sometimes make it harder to become pregnant.
This is why early diagnosis and treatment can be important for people who hope to have children in the future.
What Causes Endometriosis?
The exact cause of endometriosis is still being researched. However, experts believe a combination of factors may contribute to the condition.
Retrograde Menstruation
One widely discussed theory is retrograde menstruation. This happens when menstrual blood flows backwards through the fallopian tubes into the pelvic cavity instead of leaving the body through the vagina.
These cells can then implant outside the uterus and begin growing, which may lead to inflammation and pain.
Genetics
There is strong evidence that endometriosis can run in families.
If a close relative such as a mother or sister has the condition, the chances of developing it may be higher. This suggests a genetic link that researchers are continuing to study.
Immune System Factors
Another possible factor is how the immune system responds to misplaced endometrial-like tissue.
Normally, the body should recognise and remove cells that grow in unusual places. In people with endometriosis, the immune system may not clear these cells effectively, allowing them to develop and spread.
Hormonal Influences
Hormones, particularly oestrogen, play a major role in the growth of endometriosis tissue.
Higher levels of oestrogen may encourage this tissue to grow and bleed, which can worsen symptoms such as heavy bleeding and pelvic pain.
Scarring and Adhesions
As the condition progresses, repeated inflammation can lead to scarring inside the pelvis.
Scar tissue can cause organs such as the ovaries and bowel to stick together. These adhesions can increase pain, reduce mobility of organs and sometimes affect fertility.
Why Endometriosis Symptoms Are Often Missed
Despite being common, endometriosis is often misunderstood and underdiagnosed.
There are several reasons why symptoms may be overlooked.
Period Pain Is Often Normalised
Many people grow up hearing that painful periods are normal. As a result, severe symptoms are sometimes ignored or dismissed.
However, if period pain or heavy bleeding stops you from living your normal life, it is important to speak to a healthcare professional.
Symptoms Overlap With Other Conditions
Endometriosis symptoms can also resemble other health issues such as:
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Irritable bowel syndrome
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Pelvic inflammatory disease
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Ovarian cysts
Because of this overlap, diagnosis can sometimes take several years.
Lack of Awareness
Public awareness of endometriosis has improved in recent years, but many people still do not recognise the early signs.
Education and open conversations about menstrual health are essential in helping people seek support sooner.
Managing Symptoms and Everyday Comfort
While medical treatment should always be discussed with a healthcare professional, there are ways to improve everyday comfort when living with symptoms like heavy bleeding and pelvic pain.
Many people find support through:
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Pain management strategies recommended by doctors
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Gentle movement such as walking or yoga
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Heat therapy for pelvic pain
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Comfortable period protection during heavy flow
When periods are very heavy, choosing reliable and comfortable protection can make a significant difference to daily life. Leak proof underwear can provide reassurance and help people feel more confident during unpredictable cycles.
Endometriosis is a complex condition that affects millions of people worldwide. Common symptoms include severe pain, heavy bleeding, fatigue and digestive discomfort. Over time the condition can also lead to scarring and in some cases impact fertility.
Although the exact cause is still being researched, factors such as genetics, hormonal influences and immune system responses are believed to play a role.
If your period symptoms feel overwhelming or interfere with daily life, it is important to seek medical advice. Early recognition of endometriosis can help people access the right care and improve long term wellbeing.
Most importantly, remember that severe period pain is not something you simply have to live with.
If you experience heavy bleeding or unpredictable periods, finding comfortable and reliable protection can help you feel more confident throughout your cycle.
At NIXI Body, we design leak proof underwear that supports women through periods, bladder leaks and conditions such as endometriosis. Our Carla knickers were created in collaboration with The Endometriosis Foundation to provide protection, comfort and peace of mind when you need it most. Holding up to 20ml (4 tampons) worth of blood, a soft, seamless waistband for bloating or stomas but still super discreet - they are perfect for heavier periods.
Explore our collection of leak proof period underwear and discover solutions designed for real life.