Stress can prompt increased acid secretion and cause the esophageal sphincter to malfunction. Make sure you take the time to chew thoroughly as well. Sometimes heartburn will flare because the food is simply too large to get through the digestive tract and it, along with the acids, is forced back up.
These home remedies should help you keep your heartburn under control. However, if your heartburn is frequent and severe, be sure you talk to your doctor about it.