The current theory is that the bacterium Heliobacter pilori is the cause, but obviously the health of the mucous membrane is key to prevention of ulcers. Heartburn sometimes occurs when the sphincter muscle connecting the esophagus to the stomach opens and allows chyme to reenter the esophagus, which is not resistant to the NewBiotics acidic stomach juices. Antacids are commonly prescribed but most cases of stomach distress are due to low levels of hydrochloric acid, not too much. Dyspepsia is the term for imperfect or painful digestion, usually brought on by low levels of hydrochloric acid. Symptoms include sour belching, discomfort, nausea and vomiting. Supplements of hydrochloric acid can be helpful in these conditions–not antacids, which only make matters worse. http://www.probioticspotency.com/newbiotics