Most people have experienced the uncomfortable burning sensation that comes after eating, but what exactly is happening inside the body? Although acid reflux and heartburn are closely linked, they are not the same thing.

Heartburn is a common symptom of acid reflux, usually felt as a burning sensation in the chest. Acid reflux, meanwhile, happens when stomach contents flow back up into the oesophagus.

Occasional heartburn after a large or spicy meal is common, but frequent symptoms may point to gastro-oesophageal reflux disease (GORD), known as GERD in some countries. This long-term condition can lead to complications if left untreated.

Understanding the difference can help you know when simple lifestyle changes may be enough and when it's time to seek medical advice.

What Is Acid Reflux?

Acid reflux occurs when stomach contents flow backwards into the oesophagus, the tube connecting the mouth to the stomach.

Normally, a ring of muscle called the lower oesophageal sphincter (LOS) closes after food enters the stomach. If it weakens or relaxes at the wrong time, stomach acid can travel upwards, irritating the lining of the oesophagus.

Dr Kyle Hoedebecke, a board-certified family medicine physician and Clinical Advisor at Alpas Wellness NOVA, said acid reflux is the process itself, rather than the symptom people usually notice.

'Acid reflux occurs when the stomach contents move back up the oesophagus from the stomach towards the throat, whereas heartburn produces a burning sensation in the middle area of the chest,' he explained.

What Is Heartburn?

Heartburn refers to the burning pain or discomfort that develops in the chest when stomach acid irritates the lining of the oesophagus.

Despite its name, heartburn has nothing to do with the heart.

The discomfort often develops after eating, when bending over or when lying down, and may be accompanied by a sour or bitter taste in the mouth.

Dr Edmundo Rodriguez-Frias, a double board-certified gastroenterologist and geriatrician, explained: 'The term heartburn describes the feeling of heat within your chest that results from this acid flowing up into your oesophagus.'

In other words, acid reflux is the cause, while heartburn is one possible symptom.

Can You Have Acid Reflux Without Heartburn?

Yes.

Although heartburn is the symptom most people associate with acid reflux, not everyone experiences it.

Instead, acid reflux may cause:

  • A sour or bitter taste in the mouth
  • Food or stomach acid coming back into the throat (regurgitation)
  • A chronic cough
  • Hoarseness
  • Frequent throat clearing
  • A sensation of a lump in the throat
  • Bad breath

'There are even cases where someone suffers from acid reflux without heartburn,' Dr Hoedebecke said.

Because these symptoms may resemble allergies, asthma or throat infections, reflux can sometimes go unrecognised.

What Causes Acid Reflux?

Several factors increase the likelihood of acid reflux by putting pressure on the stomach or relaxing the lower oesophageal sphincter.

Common triggers include:

  • Eating large meals
  • Lying down shortly after eating
  • Being overweight or obese
  • Smoking
  • Drinking alcohol
  • Pregnancy
  • Hiatus hernia

Certain foods and drinks may also trigger symptoms in some people, including:

  • Fatty foods
  • Chocolate
  • Peppermint
  • Coffee and other caffeinated drinks
  • Spicy foods

Triggers vary between individuals, so keeping a food diary may help identify patterns.

When Does Acid Reflux Become GORD?

Most people experience occasional heartburn after overeating or eating trigger foods.

However, frequent or persistent symptoms may indicate gastro-oesophageal reflux disease (GORD), a condition in which acid reflux occurs regularly and begins to affect quality of life or damage the oesophagus.

According to Dr Rodriguez-Frias, recurrent symptoms are an important warning sign.

'Individuals are more likely to be diagnosed with GORD if they experience reflux symptoms more than once a week or if their symptoms prevent them from carrying out activities in their daily routine,' he said.

Similarly, Dr Hoedebecke advised that heartburn occurring two or more times a week, particularly if it regularly disrupts sleep or requires frequent antacid use, should be medically assessed.

How Is Acid Reflux Treated?

Treatment depends on how often symptoms occur and how severe they are.

Lifestyle changes

For occasional acid reflux, simple lifestyle adjustments may provide significant relief.

Dr Hoedebecke recommends:

  • Eating smaller meals
  • Waiting at least two to three hours after eating before going to bed
  • Raising the head of the bed by around four inches to reduce night-time symptoms
  • Maintaining a healthy body weight
  • Identifying and avoiding personal food triggers

Stopping smoking and limiting alcohol intake may also help reduce reflux episodes.

Medicines

Several medicines are available to relieve acid reflux.

Antacids work quickly by neutralising stomach acid and are often suitable for occasional symptoms.

For more frequent reflux, a doctor may recommend:

  • H2 receptor blockers, which reduce acid production
  • Proton pump inhibitors (PPIs), which suppress stomach acid more effectively and are commonly prescribed for persistent reflux or GORD

People who find themselves relying on over-the-counter medication for prolonged periods should speak to their GP rather than continuing to self-treat.

When Should You Seek Medical Advice?

Persistent acid reflux should not be ignored.

Without appropriate treatment, chronic reflux can damage the oesophagus and increase the risk of long-term complications.

Dr Hoedebecke warned that untreated GORD may lead to inflammation of the oesophagus, narrowing of the oesophagus (known as strictures) and Barrett's oesophagus—a condition associated with an increased risk of oesophageal adenocarcinoma.

'A common myth I often hear is that recurring reflux is nothing more than a minor annoyance,' he said.

'Finding ways to treat persistent reflux symptoms is important to improve your quality of life and prevent negative health outcomes in the future.'

When Should You Seek Urgent Medical Attention?

Although uncomplicated acid reflux is common, some symptoms require immediate medical assessment because they may indicate a more serious condition.

Both experts advise seeking urgent medical care if you experience:

  • Difficulty swallowing
  • Pain when swallowing
  • Unexplained weight loss
  • Persistent or repeated vomiting
  • Vomiting blood
  • Black, tarry stools
  • Chest pain, especially if it could be related to the heart

These symptoms are not typical of uncomplicated reflux and should never be ignored.

Common Myths About Acid Reflux

Myth: Heartburn and acid reflux are the same thing

Heartburn is a symptom, while acid reflux is the process causing stomach acid to move into the oesophagus.

Myth: Only spicy food causes reflux

Although spicy foods may trigger symptoms in some people, fatty meals, caffeine, chocolate, alcohol and large meals are also common triggers.

Myth: Persistent reflux is harmless

Frequent reflux should always be assessed. Untreated GORD can cause inflammation, scarring and Barrett's oesophagus, increasing the risk of oesophageal cancer.

Although acid reflux and heartburn are closely connected, they are not interchangeable. While occasional symptoms are common, frequent or persistent reflux should not be dismissed as a normal part of life. Understanding the difference can help people recognise when simple lifestyle changes may be enough and when it's important to speak to a GP to prevent potential complications and receive appropriate treatment.