What are the symptoms of acid indigestion?

Heartburn. Acid indigestion has many names including dyspepsia, reflux, gerd (gastro-esophageal reflux disorder), and can result from ulcers and gastritis (inflammation of the stomach lining). It is caused by acid entering the esophagus hitting tissue not able to handle it.Burning, sour taste in the mouth, belching, regurgitation of food, cough, pain(stomach, chest), nausea can occur from this irritation.