Heartburn vs Acid Reflux vs Indigestion: The Difference

Medically reviewed content. This article is for general information only and does not replace advice from a qualified healthcare professional. If your symptoms are severe, frequent or persistent, please see your doctor.

“Heartburn.” “Acid reflux.” “Indigestion.” Most people use these three words interchangeably — and they’re not entirely wrong, because the conditions overlap. But they’re not exactly the same thing, and understanding the difference matters because each one has a slightly different cause, a different treatment focus, and different warning signs that mean you should see a doctor.

If you’ve ever felt a burning sensation in your chest after a peppery meal, a sour taste creeping up your throat at night, or a bloated, uncomfortable fullness after eating — you’ve experienced one or more of these. Here’s how to tell them apart and treat each one properly.

The Quick Definitions

Before we get into the details, here’s a simple way to think about it:

• Acid reflux is the cause — stomach acid escaping upwards into the food pipe (oesophagus).
• Heartburn is a symptom of acid reflux — the burning chest sensation it produces.
• Indigestion (dyspepsia) is a broader category of digestive discomfort, of which heartburn is just one possible symptom.

In other words: acid reflux causes heartburn, and heartburn is one type of indigestion — but indigestion can also exist without any heartburn at all.

What Is Acid Reflux?

Acid reflux happens when stomach acid flows backwards (refluxes) from the stomach up into the oesophagus — the tube that carries food from your mouth to your stomach. Normally, a ring of muscle at the bottom of the oesophagus (the lower oesophageal sphincter) keeps acid in the stomach where it belongs. When this muscle weakens or relaxes at the wrong time, acid escapes upwards, irritating the sensitive lining of the oesophagus.

Common Symptoms of Acid Reflux

• Burning sensation in the chest or throat (heartburn)
• Sour or bitter taste in the mouth
• Sensation of food or liquid coming back up
• Dry cough or hoarse voice, especially in the morning
• Difficulty swallowing
• Worsening symptoms when lying down or bending over

Common Causes of Acid Reflux

• Eating large or heavy meals, especially late at night
• Lying down too soon after eating
• Spicy, fatty or peppery foods (a big culprit in Nigerian diets)
• Carbonated and caffeinated drinks
• Alcohol and smoking
• Being overweight or pregnant
• Stress and anxiety
• Certain medications

When acid reflux happens frequently — typically more than twice a week — it’s classified as GERD (gastro-oesophageal reflux disease), a chronic condition that needs proper medical attention.

What Is Heartburn?

Heartburn is the specific burning sensation you feel in the middle of your chest when stomach acid irritates the lining of your oesophagus. Despite the name, it has nothing to do with the heart — it just happens to occur in the same area of the chest, which is why some people mistake it for a heart problem.

What Heartburn Feels Like

• A burning sensation behind the breastbone, usually after eating
• Pain that can spread upwards towards the throat
• An acidic or sour taste at the back of the mouth
• Worse when bending over, lying down or after large meals
• Often relieved by antacids or sitting upright

Heartburn is the most common symptom of acid reflux — but it’s a symptom, not a condition in itself. Treating heartburn usually means treating the underlying reflux.

What Is Indigestion (Dyspepsia)?

Indigestion, known medically as dyspepsia, is a broader term for any persistent or recurrent discomfort in the upper abdomen. Heartburn is sometimes part of indigestion, but indigestion can also exist on its own — with completely different symptoms.

Common Symptoms of Indigestion

• Uncomfortable fullness during or after a meal
• Bloating in the upper abdomen
• Burping or excessive wind
• A burning or gnawing sensation in the stomach (separate from heartburn in the chest)
• Nausea after eating
• Early fullness — feeling full after only a few bites

Common Causes of Indigestion

• Eating too quickly or too much
• Fatty, spicy or fried foods
• Stress, anxiety and rushed mealtimes
• Smoking and alcohol
• Excess stomach acid
• Gastritis or stomach ulcers
• Certain medications, including painkillers like ibuprofen
• Helicobacter pylori infection (a bacterial cause of chronic indigestion and ulcers)

Quick Comparison: Heartburn vs Acid Reflux vs Indigestion

How to Treat Each Condition

Because these conditions overlap, the same lifestyle adjustments help all three. But the right medicine depends on which symptoms dominate.

Lifestyle Changes That Help All Three

• Eat smaller meals more frequently rather than large meals
• Avoid eating within 2–3 hours of bedtime
• Cut back on spicy, fatty, fried and peppery foods
• Reduce caffeine, fizzy drinks and alcohol
• Stop smoking
• Maintain a healthy weight
• Elevate the head of your bed if night-time reflux is a problem
• Manage stress through rest, exercise and relaxation

Treating Acid Reflux and Heartburn

The goal is to neutralise excess stomach acid quickly and protect the oesophagus from further irritation. The first-line treatment is an antacid — a medicine that chemically neutralises stomach acid within minutes. Antacids containing both aluminium hydroxide and magnesium hydroxide are particularly effective because the two ingredients balance each other out (one can cause constipation, the other can cause looseness — together they’re well-tolerated).

Liquid antacid suspensions generally work faster than tablets because the active ingredients are already dissolved and coat the oesophagus on the way down.

Treating Indigestion with Bloating and Wind

Indigestion often involves trapped gas and bloating as well as excess acid — so a plain antacid alone may only solve half the problem. A triple-action antacid that combines two acid-neutralisers with an anti-flatulent like simethicone tackles both issues at once: neutralising acid and helping small gas bubbles combine into larger ones that can be expelled, relieving bloating and excessive wind.

Gusteeze Antacid Syrup is a NAFDAC-registered peppermint-flavoured liquid antacid that takes this triple-action approach — combining aluminium hydroxide and magnesium hydroxide to neutralise excess acid, with simethicone to relieve trapped wind and bloating. Its liquid format means it acts faster than tablets, and the peppermint flavour soothes the digestive system as it works. Always read the label and follow the recommended dosage.

When to See a Doctor

Most cases of heartburn, reflux and indigestion respond well to lifestyle changes and over-the-counter antacids. But some symptoms need medical attention — don’t ignore them. See a doctor if you experience:

• Heartburn or reflux symptoms more than twice a week (possible GERD)
• Difficulty or pain when swallowing
• Persistent nausea or vomiting
• Vomiting blood or material that looks like coffee grounds
• Black, tarry stools or blood in your stool
• Unintentional weight loss
• Loss of appetite over weeks
• Severe or worsening abdominal pain
• Symptoms that don’t respond to antacids after 2 weeks
• Chest pain accompanied by shortness of breath, sweating, jaw or arm pain — call for emergency help immediately as these can be heart-attack symptoms, not heartburn

These can be signs of GERD, a stomach ulcer, gastritis, an H. pylori infection, or in rare cases, more serious conditions that need proper medical assessment.

The Bottom Line

Heartburn, acid reflux and indigestion aren’t the same thing — but they’re closely related, share many causes, and respond to many of the same treatments. Acid reflux is the underlying problem, heartburn is its most common symptom, and indigestion is the wider category of digestive discomfort that often includes bloating and trapped wind alongside any burning sensation.

For occasional symptoms, simple lifestyle adjustments and a good antacid usually do the job. For persistent or severe symptoms, see a doctor — because what feels like ordinary heartburn can occasionally be something that needs proper investigation.

Listen to your body, take symptoms seriously when they recur, and get back to enjoying your meals.

Disclaimer: This article is for general health information only and does not replace medical advice. Always consult a qualified healthcare professional before starting any medicine, especially if you are pregnant, breastfeeding, or have an existing health condition. Always read the label before use. Keep all medicines out of reach of children.