Endo Belly: What It Is, Why It Happens, and How to Find Relief

If your stomach is swollen, feels painfully tight and seems to change in noticeable size throughout the day, you’re not imagining it, and it may be linked to endometriosis.

Many women with endometriosis may be told that their bloating ‘isn’t that bad’ or else they are experiencing another separate condition. In reality, endometriosis may directly cause intense swelling, hardness and stomach pain that lasts for hours.

This phenomenon, sometimes known as ‘endo belly’, is a set of known symptoms of endometriosis. This guide covers what these are, what causes them and how you can get effective relief.

What Is Endo Belly?

‘Endo belly’ is a term commonly used to describe symptoms of endometriosis where the stomach feels full, tight and stretched and where it looks swollen or bigger than usual.

Endo belly isn’t an official medical term - it’s a way people who experience these symptoms use to discuss them and share support or knowledge. A clinician may use terms like ‘abdominal bloating or distention’ when referring to the same symptoms.

One thing to note is the severity of endo belly symptoms doesn’t always correspond to other endometriosis symptoms. It’s possible to have milder general symptoms and more severe endo belly.

What Causes Endo Belly?

There isn’t just one cause of endo belly. The effect endometriosis has on the body and the other symptoms it causes can contribute to stomach swelling, pain and discomfort in different ways. Some factors can include:

• Inflammation

• Changes to digestion and gut function

• Hormonal changes

• Constipation

• Other health conditions that can occur alongside endometriosis, which may include irritable bowel syndrome (IBS), indigestion, Crohn's disease and ulcerative colitis (conditions that cause long-term inflammation of the gut)

Identifying what factors might be contributing to your endo belly can help you get the right treatment.

Inflammation and endometrial-like tissue

Because endometriosis involves tissue similar to the womb lining growing in other parts of the body, it can cause inflammation. These tissues respond to hormones in a similar way to the womb lining itself, meaning they react in response to chemicals called prostaglandins which are involved in the period cycle. This reaction can cause inflammation in the surrounding areas, like the pelvic area, and nearby organs like the gut.

Digestive and bowel involvement

Since endometriosis can cause inflammation in the gut, this can then lead to digestive disorders that further contribute to endo belly symptoms. These symptoms can include stomach or pelvic pain, constipation, diarrhoea and painful bowel movements. These symptoms can also become more intense when you get your period.

There is quite a lot of overlap between endometriosis and IBS. Both can cause bloating, gas, constipation, diarrhoea and other changes to bowel habits. For people with both, the symptoms can be hard to separate and can be even more intense. This overlap is also one of the reasons why endometriosis is often mistaken for a gut condition.*

Hormonal fluctuations

Changes to your hormone levels during your normal period cycle can affect endometriosis symptoms, as well as digestive function. Oestrogen levels in particular can change how your bowels function, and prostaglandin levels can also lead to endometriosis-related inflammation.*

This is a more likely factor that may be causing your endo belly symptoms if they follow a cycle like your period does. If you notice endo belly occurring around the same time each month, it may be linkedto changes in hormone levels during your period. A diary can help you identify the pattern.

Endo Belly vs. Normal Bloating: How to Tell the Difference

Many people get bloating from time to time and it can appear in a way that mimics your endo belly symptoms. Still, there are some differences that might point to one over the other.

So, if your bloating is more severe, long-lasting, visibly noticeable and occurs with period pain each month, then it may be endo belly. However, it’s not always clear cut and endo belly symptoms can occur alongside normal bloating as well.

If you’d like some extra insight into your symptoms, a Hers clinician may be able to help.

Keeping a cycle and symptom diary

If you’re having trouble figuring out your symptoms, or you would like to understand them better, tracking them could help. Keep a simple diary while eating normally to identify triggers and record:

• When your symptoms occur, how long they last and how severe they are

• Food you’ve eaten recently

• Where you are in your cycle and whether you’re on your periods

Once you have your diary in place, you may then start to notice clear patterns around diet or your period and whether your symptoms represent normal bloating or endo belly more. You can then show this diary to a healthcare professional to help with diagnosis, if needed.

Common Symptoms That Often Accompany Endo Belly

Endo belly often comes with other endometriosis symptoms. Not everyone gets all of them and getting bloating with some of these symptoms doesn’t guarantee you have endometriosis either.

Common symptoms that may accompany endo belly include:

• Pelvic pain – pain in the lower stomach or pelvis may occur and it can be mild or more severe

• Painful periods – period pain that is severe, long-lasting and interferes with daily life can be worth mentioning to a healthcare professional

• Pain during sex – this is another sign of endometriosis that may accompany endo belly, particularly with deeper penetration

• Bowel symptoms – constipation, diarrhoea, gas and pain when going to the toilet can all occur and may be more likely around your period

• Bladder symptoms – bladder pain, pain or discomfort when peeing and needing to pee urgently and more often can all occur, especially if the endometriosis occurs close to the bladder

• Fatigue – tiredness can occur and be related to poor sleep, pain, inflammation and heavy periods

These symptoms can indicate a number of conditions, not just endometriosis. It’s important a clinician is able to assess your symptoms so you know for sure if they’re being caused by endometriosis, other health conditions or a combination of both.

How to Manage and Reduce Endo Belly

Managing endo belly depends on your symptoms and factors contributing to the bloating and discomfort. For some people, diet and lifestyle changes may be enough, but for others, it may be necessary to medically treat the underlying endometriosis.

Remember - it’s always best to get help from a clinician to confirm where your symptoms are coming from, so together you can agree on an appropriate treatment plan.

Dietary approaches

Dietary changes that may improve endo belly symptoms include:

• Eating small, regular meals, eat slowly and chew thoroughly

• Identifying your own trigger foods using a food-symptom diary, such as fizzy drinks, alcohol, caffeine or very large meals. Avoid cutting out whole food groups, such as dairy or gluten, without advice from a clinician or dietitian.

• Trying a low-FODMAP diet* – this helps identify a set of food triggers related to specific carbohydrates

• Staying hydrated

• Increasing your fibre intake – insoluble for constipation and soluble for diarrhoea

Lifestyle and symptom management

As well as dietary changes, there are other lifestyle changes you could make to help manage your endo belly symptoms, such as:

• Getting regular, gentle exercise

• Using heat therapy, like a hot water bottle or heated blanket

• Managing stress using mindfulness techniques like meditation

• Wearing looser, comfortable clothing to avoid extra pressure on your stomach

• Get enough sleep to help with fatigue and stress, and practice sleep hygiene techniques like limiting screen time before bed, eating dinner at least 3 hours before bedtime and establishing a regular sleep routine

Medical management

Medical treatments that may help treat endo belly, its underlying symptoms or endometriosis itself include:

• Pain relief – painkillers like ibuprofen may help with pain and inflammation but it’s important to speak to a clinician or pharmacist for advice on pain relief

• Hormonal treatments – the contraceptive pill or other hormonal medications may be prescribed to reduce the hormonal symptoms, which can include endo belly when linked to your period cycle

• Medication for diarrhoea or constipation – over-the-counter medications like loperamide for diarrhoea or bisacodyl for constipation may help

• Specialist endometriosis care – a gynaecologist or endometriosis specialist can help with diagnosis and treatment planning for more severe symptoms

• Laparoscopy – surgery to remove endometriosis lesions may be considered when symptoms are severe and don’t respond to other treatment

When to See a Doctor

There’s a number of reasons why you might be getting bloating and other endo belly symptoms. If you don’t already have an endometriosis diagnosis then it’s best not to assume. Speaking to a clinician about your health is always a good idea, particularly if your symptoms are long-lasting, severe, getting worse or affecting your quality of life.

You could consider seeing a clinician if:

• Your bloating doesn’t go away and is getting worse, especially if your stomach becomes very noticeably swollen

• Your pain interferes with your daily life, including working, sleeping, eating, exercising or any other activities

• Symptoms follow a specific pattern around your period

• You’ve tried lifestyle and dietary changes, but they haven’t helped

• You’re experiencing very painful periods, pain during sex, bowel or bladder symptoms as well or you’re experiencing ongoing tiredness

• You have bloating that doesn't come and go (it is there most days), especially if you are over 50 or it comes with feeling full quickly, loss of appetite, pelvic or tummy pain or needing to pee more often. These can occasionally be signs of ovarian cancer and should be checked promptly.

Don’t give up on getting answers

It may be frustrating when you’ve had symptoms for a while and even seen a clinician already and you still don’t have a diagnosis.

Endometriosis is not straightforward or quick to diagnose, taking on average almost a decade to get a diagnosis..* Clinicians do need to explore alternative explanations for your symptoms and often lifestyle changes are recommended before more extensive assessment or treatment is considered.

If you feel like your symptoms have not been addressed properly, return to your clinician and explain how they affect your everyday life. It may help to:

• Keep a symptom diary you can show your clinician to explain about timing and severity

• Be clear when explaining the pattern of your symptoms – write down what you plan to say in advance if it helps

• Explain honestly how severe your symptoms are and don’t downplay pain or discomfort

• Mention any relevant health history, like painful periods, pain during sex, bowel or bladder symptoms and any previous consultations or assessments you’ve had

• Ask about next steps and a timeline for diagnosis

• Arrange a follow-up appointment

FAQs

Does endo belly go away?

It can come and go. You may notice your endo belly symptoms flare up around your period each month. Symptoms can also improve with changes to diet for some people. If you have persistent swelling of the stomach then it’s important to talk to a clinician as it may be caused by something other than endometriosis.

Is endo belly the same as IBS?

No, although they can be closely linked.* Endo belly is a term for bloating related to endometriosis specifically and irritable bowel syndrome (IBS) is a separate digestive condition. They can share many similar symptoms though, including constipation, diarrhoea, bloating and discomfort.

What does an endo belly flare feel like?

It can cause swelling, discomfort or pain and sometimes hardness of the stomach. Your stomach may feel tight, heavy and uncomfortable for several hours. It may be accompanied by a feeling of needing to go to the toilet urgently, pain during sex, period pain and tiredness as well.

Can you have endo belly without an endometriosis diagnosis?

Yes, it’s possible to experience endo belly before you’ve been diagnosed. However, endo belly symptoms on their own aren’t enough to confirm endometriosis and can be caused by other conditions. It’s important to see a clinician for diagnosis if you suspect endometriosis as they can help advise you and assess you for any underlying health conditions. 

What foods help with endo belly?

There aren't specific foods that treat endo belly. If you notice a food or drink repeatedly triggers your bloating, cutting back may help. A dietitian can support you if you'd like to try a structured approach.