Heartburn and acid reflux are very common symptoms of GERD. Reflux is the sensation of stomach contents rushing into the pharynx or mouth without nausea or exertion, and when it contains an acidic taste, it is called acid reflux for the sake of acidity alone. Heartburn is a burning sensation behind the sternum or under the raphe, often extending upward from the lower part of the sternum. Heartburn and acid reflux often appear 1 hour after a meal and can be aggravated by bending over in a single-lying position or by increased abdominal pressure. In some patients, heartburn and acid reflux symptoms can occur at night when they fall asleep, while some patients will have coughing, difficulty in swallowing, and a feeling of foreign body sensation behind the sternum in addition to the symptoms of acid reflux and heartburn.