.Heartburn, according to Wikipedia, 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. It is usually with regurgitation of gastric acid (gastric reflux) which is the major symptom of gastroesophageal reflux disease (GERD). It however may also be a symptom of ishemic heart disease so concluding that it is heartburn prematurely may lead to misdiagnosis.
For occasional heartburn like mine, a couple of Tums or any antacid can help. If necessary, add a couple more. It won't hurt you. Be sure to remember what kind of food that causes the heartburn and avoid it temporarily or for good (if you can). Stay in an upright position or add an extra pillow when you have to lie down.