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Heartburn is a burning pain in your chest. This pain is caused by stomach acid rising from your stomach into your oesophagus (the pipe that takes food from your mouth to your stomach).
This can cause:
- Burning pain in the middle of your chest
- Pain which is worse when you bend over or lie down
- Burning pain that radiates into your back
By learning more about the causes of, tests for, and treatment for heartburn, you can understand it better and make informed decisions to get back on track.

There are several possible causes of heartburn, and it’s important to find out what’s causing yours.
Here are the main causes of heartburn:
Gastroesophageal reflux disease (GORD)
Hiatus hernia, when part of your stomach moves up into your chest
Surgery you’ve had in the past (especially bariatric surgery)
Certain foods and drinks, such as alcohol, coffee, chocolate, and fatty or spicy foods
Being overweight
Smoking
Pregnancy
Stress or anxiety
Medication, such as anti-inflammatory painkillers
Overgrowth of bacteria in your small intestine (this is called SIBO)


Diagnostic testing allows us to pinpoint the exact cause so we can recommend the right solution.
At the Functional Gut Clinic, we use the following highly accurate and trusted diagnostic tools, to identify the underlying cause of your heartburn:
Oesophageal manometry – which measures the function of your oesophagus (food pipe)
24-hour pH impedance monitoring – which looks at whether you have any reflux
Carbohydrate malabsorption breath test – which finds out if you have certain food intolerances (lactose or fructose)
Small intestinal bacterial overgrowth (SIBO) breath test – which finds out if you have an overgrowth of bacteria in your small intestine (called SIBO)
Gastric emptying test – which measures how quickly food leaves your stomach

Urgency, diarrhoea, abdominal pain, fatigue, and unpredictable flare-ups. IBS can be a major disruptor to your work. It can make commuting, meetings, and shift work difficult. Unfortunately, IBS is not automatically classed as a disability, but it can qualify depending on its severity, duration, and impact.
Managing IBS at work means understanding your rights. The most important thing is having an accurate diagnosis. While your symptoms might be bad, without a medical diagnosis it’s difficult for your work to provide the protections you need.
Specialist IBS support can help investigate persistent symptoms and provide evidence for how they affect your daily life.
In England, Scotland, and Wales, the Equality Act 2010 defines disability as a physical or mental impairment that has substantial and long-term adverse effects on normal daily activities. That includes work.
There are three big tests in that wording:
Substantial: More than minor or trivial
Long-term: Has lasted or is expected to last at least 12 months
Daily impact: Affects activities such as travelling, eating, sleeping, concentrating, working, or using the toilet
Recurring or fluctuating can qualify when their effects return, and even when they’re in remission. Mild, occasional IBS is unlikely to meet the definition. However, if you’re dealing with frequent urgency, incontinence, severe pain, or disrupted sleep, it absolutely could be covered.
In Northern Ireland, the Disability Discrimination Act 1995 provides similar workplace protections.
A formal diagnosis isn’t essential, but it can make determining legal disability status much easier. But even a documented diagnosis isn’t always enough to count as a disability. What matters is how the conditions affect the person’s daily life.
Useful evidence may include:
GP or consultant letters
Prescriptions and treatment records
A symptom and absence diary
Occupational health recommendations
Don’t worry; your employer doesn’t have to know every medical detail. But they do need to know about the disability and any accompanying disadvantages to make reasonable adjustments.
Being classified as disabled under the Equality Act provides you with certain rights. For example, you cannot be directly discriminated against due to a disability, nor can you receive unfavourable treatment because of your IBS. So, if you are frequently absent due to the condition, that cannot be penalised.
You should also receive protection against:
Failure to make reasonable adjustments
Harassment or humiliating comments about symptoms
Victimisation after raising a complaint
The word “reasonable” can cause a lot of confusion. What might be reasonable for a large corporation isn’t reasonable for a small family-run shop. It depends on effectiveness, practicality, cost, disruption, and the employer’s resources.
You should expect your employer to make some adjustments. That could include immediate, unrestricted toilet access, a workstation positioned near suitable facilities, or flexible start times or breaks.
Employers are responsible for paying for reasonable adjustments. However, many of the IBS-related changes cost little or nothing.
Disability-related absence does not have to be ignored completely, but an employer should consider whether its normal attendance procedure places the employee at a disadvantage.
Many people are nervous about asking their employer for adjustments. It doesn’t have to be difficult. Follow these steps:
1.Contact the manager or HR team in writing.
2.Explain how IBS creates a specific workplace disadvantage.
3.Suggest practical adjustments that would help.
4.Offer appropriate medical or occupational health evidence.
5.Ask for the agreed measures to be recorded and reviewed.
Remember, you don’t have to disclose every embarrassing detail. Focus on the functional issue, what will help, and work with your employer to make the situation best for everyone.
Your employer may refuse a particular request. If that’s the case, ask why the request was refused and whether an alternative could achieve the same result.
If you still feel like the refusal wasn’t fair, you can raise the issue informally before escalating to a formal grievance process. Contact a union representative or ACAS if it remains unresolved.
You shouldn’t have to spend every working day worrying about the nearest toilet or pretending everything is fine. Speak to your manager, HR department, GP, or occupational health team if IBS is making your job harder.
You may also find these resources useful:
Guts UK offers reliable IBS information and a free digestive-health helpline.
Scope has practical advice on requesting reasonable adjustments.
Access to Work may provide practical or financial support if a health condition affects your ability to work.
Explore possible causes of bloating, pain, diarrhoea, constipation, and urgency, with The Functional Gut Clinic, and receive the evidence you need to make a formal request.
Ready the next article: How Long Does an IBS Flare-Up Last?
Heartburn is often experienced after eating and can last anywhere from a few minutes to several hours. The stomach releases more acid after eating certain foods, including spicy dishes, fatty foods, citrus fruits, tomato-based products, garlic, and caffeinated drinks. The more acid that is produced, the greater the risk of heartburn.
Other factors include obesity, smoking, stress, pregnancy, and eating too close to bedtime.



Heartburn primarily causes an uncomfortable or burning sensation in the middle of your chest. You may also experience:
A burning sensation in your throat
A strong acidic or sour taste in your mouth
Difficulty swallowing (dysphagia)
A feeling of pressure or pain behind your breastbone
Repeated coughing
Hoarse voice
In addition to these symptoms, the pain from the acid can get worse when lying down or bending over. This is because the acid flows out of the stomach and into the oesophagus. Whenever you lie down, you increase the risk of heartburn-related symptoms.
Constant heartburn is a sign of a severe underlying condition. Most people experience heartburn in episodic attacks – usually after consuming certain foods. If the heartburn is persistent, it’s crucial to speak to a medical professional. You can also consider organising a test via The Functional Gut Clinic (see below).


Heartburn occurs when the contents of the stomach enter the oesophagus (the food pipe connecting your stomach to your throat). Usually, the stomach contents are prevented from going back into the oesophagus by a juncture called the lower oesophageal sphincter. However, in some people, this sphincter doesn’t function properly.
Heartburn is a symptom of gastroesophageal reflux disease (GORD). GORD simply refers to the backflow of acid from the stomach into the oesophagus. GORD is the condition; heartburn is the symptom.

Several factors increase the risk of heartburn. The causes of heartburn and GORD either increase acid production within the stomach or affect the functioning of the lower oesophageal sphincter. These include:
Hiatal hernia. A hiatus hernia involves a part of your upper stomach penetrating through the diaphragm (the layer of muscle separating your chest from your stomach). This usually occurs due to a weakness or tear.
Pregnancy. If you become pregnant, the increased pressure during the third trimester (and sometimes earlier) forces the stomach contents backwards, causing heartburn.
Surgery. Previous surgery, especially bariatric surgery, increases the risk of not only heartburn but also a hiatus hernia.
Smoking. Smoking is closely linked to heartburn and GORD. People who quit smoking notice a significant reduction in heartburn symptoms.


Overweight or obesity. Being overweight or obese is a major risk factor for GORD. This is likely due to the increased pressure in the stomach alongside a diet high in fatty, processed foods.
Medications. Certain medications, such as anti-inflammatory painkillers (e.g., ibuprofen or aspirin), sedatives, and blood pressure medications, can increase your risk of heartburn.
Stress or anxiety. An increase in stress or anxiety can increase acid production in some people, leading to heartburn. It’s often accompanied by another factor.
Small intestine bacterial overgrowth (SIBO). Excessive bacterial growth in the small intestine leads to increased abdominal pressure and subsequent acid reflux, which can cause heartburn. Managing SIBO often reduces these symptoms.
Acid production is a normal part of the stomach’s function. The acid helps digest food. Certain foods require more acid to digest, triggering an increased production in the stomach.
For most people, this isn’t an issue as the acid flows into the small intestine. However, if you struggle with heartburn and GORD, then it’s sensible to limit or avoid certain foods. These include:
Citrus fruits (like oranges and grapefruits)
Tomatoes and tomato-based products
Spicy foods
Garlic and onions
Chocolate
Mint
Fatty or fried foods
Caffeinated beverages (such as coffee and tea)
Carbonated drinks
Alcohol
It’s not just the food. Eating an excessively large meal, wearing tight clothes, and lying down soon after eating can increase the risk of heartburn. If you’re experiencing persistent heartburn, it’s often linked to diet rather than another factor.

No. Heartburn specifically refers to the burning sensation in the chest. GORD is the underlying condition involving the backflow of acid. Heartburn is a symptom of GORD. Acid reflux is sometimes used as shorthand for GORD – however, not every attack of acid reflux is an example of GORD.
Acid reflux refers to any episode of acid backflowing into the oesophagus. If the episodes occur two or more times a week, it is diagnostic for GORD. Most people experience acid reflux episodes occasionally. This can increase in frequency as acid reflux progresses to GORD. You should speak to a doctor if you notice this change.

Heartburn is always caused by the backflow of acid into the oesophagus. Several other conditions can create a similar sensation. For example:
Oesophageal ulcers. Ulcers occur due to erosion of the oesophageal lining. Often associated with acid reflux or overusing anti-inflammatory medications.
Oesophagitis. Severe inflammation of the oesophagus is closely linked to GORD. However, it can also be caused by medications and infections. An allergic condition known as eosinophilic oesophagitis can also cause heartburn.
Functional heartburn. Unlike the other conditions, this isn’t a problem with your oesophagus or stomach. It’s caused by a disorder of the gut-brain connection. It involves the same heartburn symptoms but without any signs of acid reflux or inflammation. It’s connected to overactive nerves.


Heartburn is not a permanent condition. It lasts as long as the acid is present to irritate the oesophagus and throat. Most people experience heartburn and GORD for between a few minutes to several hours. The timespan often depends on the underlying cause. For example, if your heartburn is due to your diet, it might go away within a few minutes. In contrast, if you have a hiatus hernia, the heartburn might persist for much longer, even after standing up.
Constant heartburn is a rare symptom. It’s a concerning sign, as the acid can continue to damage your oesophagus. If you’re constantly feeling heartburn (or using lots of antacids), then it’s critical to speak to a doctor.
Most cases of heartburn aren’t serious. It’s common to experience heartburn after a large meal or eating certain foods. However, if the heartburn becomes repeated or constant, it can cause long-term damage. Usually, the damage caused by acid reflux heals like any injury. If it happens regularly, then the oesophagus lining can become permanently injured.
Potential long-term complications include:
Oesophageal strictures. The lining of the oesophagus becomes replaced with scar tissue due to repeated inflammation. This scar tissue causes a narrowing of the oesophagus (stricture), which prevents food from getting through.
Intestinal metaplasia. The tissue lining of the oesophagus undergoes a change to look more like the lining of your intestines, protecting it from damage. It is called Barrett’s oesophagus and is a precancerous condition.
Oesophageal cancer. Cancer is a rare complication of GORD and heartburn. It occurs due to persistent inflammation and cellular changes. The longer your heartburn persists, the greater the risk of cancer.
Heartburn and GORD can also indicate problems in your stomach. For example, excess acid production can lead to gastritis (stomach inflammation) and stomach ulcers. It may also aggravate preexisting conditions such as asthma.

The following tests may be used to diagnose what is causing your heartburn:
Oesophageal manometry – which measures the function of your oesophagus (food pipe)
24-hour pH impedance monitoring – which looks at whether you have any reflux
Carbohydrate malabsorption breath test – which finds out if you have certain food intolerances (lactose or fructose)
Small intestinal bacterial overgrowth (SIBO) breath test – which finds out if you have an overgrowth of bacteria in your small intestine (called SIBO)
Gastric emptying test – which measures how quickly food leaves your stomach
The following tests may be used to diagnose what is causing your heartburn:
Oesophageal manometry – which measures the function of your oesophagus (food pipe)
24-hour pH impedance monitoring – which looks at whether you have any reflux
Carbohydrate malabsorption breath test – which finds out if you have certain food intolerances (lactose or fructose)
Small intestinal bacterial overgrowth (SIBO) breath test – which finds out if you have an overgrowth of bacteria in your small intestine (called SIBO)
Gastric emptying test – which measures how quickly food leaves your stomach

Most people who experience occasional heartburn symptoms can benefit from lifestyle changes. This involves limiting exposure to potential triggers. You might want to try:
Avoiding trigger foods, such as fatty foods or caffeinated beverages
Eating smaller meals
Avoiding tight clothing
Avoiding lying down immediately after eating
Quitting smoking and alcohol consumption.
Often, people find that small changes to their diet can stop or reduce episodes of heartburn. If the heartburn continues, it’s usually a sign that something else is going on. It’s crucial to get to the bottom of your symptoms; otherwise, they will persist.



As heartburn is caused by acid, neutralising this acid relieves symptoms. The primary treatment for heartburn is an over-the-counter (OTC) antacid, such as Gaviscon or Alka-Seltzer. These medications provide immediate relief from your symptoms – perfect for tackling a sudden acid reflux attack. If you experience constant heartburn, it’s sensible to carry antacids with you. However, excessive use of antacids can cause other problems.
Your doctor may prescribe medications that prevent acid production. This includes:
Proton Pump Inhibitors (PPIs). These medications reduce stomach acid production by blocking the enzyme in the stomach lining that produces acid. Common examples include omeprazole, esomeprazole, and pantoprazole. PPIs are used to treat GORD by allowing the oesophagus to heal and preventing further damage.
H2 Receptor Antagonists. These drugs work by blocking H2 receptors on stomach cells that signal the production of acid. This results in decreased stomach acid output. Examples include ranitidine, famotidine, and cimetidine. They are effective in relieving GORD symptoms and are generally used for milder cases.

In the majority of cases, lifestyle changes and medication are enough to prevent heartburn symptoms. If GORD doesn’t respond to medication, surgery might be a potential option. This can repair a hiatus hernia, strengthening the lower oesophageal sphincter and permanently preventing the backflow of acid.
Procedures include:
Nissen fundoplication. This procedure tightens the junction between the stomach and the oesophagus.
Transoral incisionless fundoplication. A similar procedure performed non-surgically using an endoscope.
LINX device. A tiny ring of magnets is placed around the junction between the stomach and oesophagus to prevent reflux. It’s a type of minimally invasive surgery.
Heartburn is extremely uncomfortable. However, most cases are relatively mild and treatable with antacids. Speak to a medical professional if:
You experience heartburn more than once a week
You have other associated symptoms
You have difficulty swallowing
Your heartburn persists despite treatment
You’re over the age of 60
You have a tight or squeezing chest pain
You cough up blood
Remember, occasional heartburn is relatively normal. But if you have constant heartburn, it’s crucial to get tested. The Functional Gut Clinic is highly experienced in diagnosing acid reflux. We’ll organise your test and provide advice on what to do next.

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Burning mid-chest, worse when bending or lying down

Difficulty going to the toilet, unusual stools, often with stomach ache or intestinal cramps, bloating, nausea or appetite loss

Feeling uncomfortably full and tight, excess belching/breaking wind, abdominal pain or gurgling

Bringing food or drink back up, difficulty swallowing, feeling that food or drink is stuck in your throat, horrible taste in your mouth

Dysphagia - difficulty swallowing, feeling that food or drink is stuck in your throat, horrible taste in your mouth

Loose or explosive stools, can’t get to a toilet in time

Cramps; sharp or dull pain, Bloating, Excessive belching, Nausea or vomiting

Stools leak unexpectedly, Can’t get to a toilet in time

Abdominal pain or cramping, bloating, changes in bowel habits and urgency, gas