Heartburn occurs when stomach acid backs up into the tube that carries food from your mouth to your stomach (esophagus). Normally when you swallow, a band of muscle around the bottom of your esophagus (lower oesophageal sphincter) relaxes to allow food and liquid to flow down into your stomach.
To prevent heartburn, it’s best to avoid lying down for at least two hours after eating. Avoiding fats, chocolate and citrus foods may also help. Antacid medications may ease symptoms immediately. Other medications such as omeprazole and ranitidine take longer to work, but may provide more effective relief