Summary

  • Heartburn is caused by stomach contents backing up into the oesophagus.
  • Eating a large meal or drinking too much coffee or alcohol are common causes.
  • Overweight people with constant heartburn can have complications.
Once food is chewed and swallowed, it is pushed by muscular waves down the oesophagus and through a sphincter (or muscle ring) into the stomach. Sometimes, even in healthy individuals, the contents of the stomach squeeze up through the sphincter and back into the oesophagus. This is called 'reflux' and feels like a burning sensation behind the breastbone.

Overindulgence is often to blame

Occasional heartburn can be caused by:
  • Eating a large meal
  • Eating a large meal and then doing some kind of physical activity, like lifting or bending
  • Too much coffee or alcohol
  • Anxiety, which can make the stomach 'churn'
  • Advanced pregnancy, when the womb pushes up against the stomach.

Treatment for heartburn

The oesophagus uses muscular contractions (called 'peristalsis') to squeeze swallowed food down into the stomach. However, food inside the stomach is only kept there by the force of gravity, so don't lie down after a big meal. Usually, taking an antacid and waiting is all the treatment needed for heartburn in healthy people.

Heartburn in overweight people

Persistent heartburn can be caused by obesity. The extra fat inside the abdominal wall reduces the amount of room for the stomach and small intestines. Any extra pressure on the stomach, such as stooping, forces the stomach contents up into the oesophagus. Weight loss may reduce the symptoms.

Gastro-oesophageal reflux disease

Frequent heartburn also called gastro-oesophageal reflux disease can also be caused by:
  • A hiatus hernia – part of the stomach is pushed up through the diaphragm and stays there.
  • Dietary factors – dietary fats, chocolate, alcohol and coffee may provoke heartburn because of their effect on the sphincter.
  • Cigarettes – giving up smoking reduces the frequency of symptoms.

Complications of gastro-oesophageal reflux disease


Chronic exposure of the oesophagus to gastric juices can lead to:
  • Oesophagitis – inflammation of the oesophagus.
  • Ulceration – with bleeding, scarring and stricture ( narrowing) of the oesophagus.
  • Barrett’s oesophagus – a premalignant condition of the lower lining of the oesophagus.

Risk reduction of gastro-oesophageal reflux disease

A person can reduce their risks by:
  • Losing weight if necessary
  • Trying not to increase abdominal pressure through bending or lifting
  • Raising the head of their bed to avoid reflux while sleeping
  • Making dietary changes and giving up smoking
  • Seeking advice from their doctor.

Where to get help

  • Your doctor
  • Your pharmacist.

Things to remember

  • Heartburn is caused by stomach contents backing up into the oesophagus.
  • Eating a large meal or drinking too much coffee or alcohol are common causes.
  • Overweight people with constant heartburn can have complications.
  • Nutritional disease: Heartburn and peptic ulcer. Encyclopædia Britannica. Encyclopædia Britannica Online. Encyclopædia Britannica Inc., 2011. Web. 24 Nov. 2011. More information here.

More information

Digestive system

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Small intestine

Large intestine

Liver and gallbladder

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Last updated: March 2012

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