sudden reflux causes
One common cause of acid reflux disease is a stomach abnormality called a hiatal hernia. This occurs when the upper part of the stomach and LES move above the diaphragm, a muscle that separates your stomach from your chest.Normally, the diaphragm helps keep acid in our stomach.But if you have a hiatal hernia, acid can move up into your esophagus and cause symptoms of acid reflux disease. These are other common risk factors for acid reflux disease: 1  Eating large meals or lying down right after a meal.2  Being overweight or obese.ut if you have a hiatal hernia, acid can move up into your esophagus and cause symptoms of acid reflux disease. These are other common risk factors for acid reflux disease: 1  Eating large meals or lying down right after a meal. 2  Being overweight or obese.