Many medications can cause acid reflux, at the point where your
esophagus meets your stomach is a valve or spichtner valve, this valve allows food
and liquid to enter your stomach, but is not supposed to allow any acids to back up into the esophagus, Certain medications (Blood Pressure and others) relax this muscle and it stays open, when the acid rises back up into the esophagus it burns or irritates the lining of the esophagus causing chest pains that are often mistaken for heart problems.