You know where your ribs meet on your cheast its like a burning feeling right there.
Definanition : Heartburn, also known as pyrosis or acid indigestion is a burning sensation in the chest, just behind the breastbone or in the epigastrium. The pain often rises in the chest and may radiate to the neck, throat, or angle of the jaw.
Heartburn is usually associated with regurgitation of gastric acid (gastric reflux) being the major symptom of gastroesophageal reflux disease (GERD).
Thats what is says in my book