Diet Plan for Heartburn Heartburn is defined as a burning sensation felt in the chest region just behind the breastbone. It is a symptom of acid reflux. The symptoms of heartburn may get worse when you eat heavy meals, spicy and oily foods. Heartburn is also common in the pregnancy because during pregnancy the progesterone hormone relaxes the lower esophageal sphincter and acid from the stomach enters the esophagus thus, develops a burning sensation. High- fat diet, acidic