Read the following information and then answer follwoing questions:
heartburn is an esophageal symptom characterized by a burning sensation behind the breastbone. it may be related to gastric hyperacidity. there is little doubt that emotional disturbance, excitement, and nervous tension result in hyperacidity, which in turn may lead to heartburn. a gesture that usually accompanies heartburn is movement of the open hand up and down the breastbone. this is in contrast to the stationary tightly clenched fist of angina pectoris. another important aspect of heartburn is that it is usually relieved, if only temporarily, by taking antacids. antacids are used in other instances as well, particularly in cases of peptic ulcer. pain is the outstanding symptom of peptic ulcer, a disorder that is chronic, periodic, almost always characterized by gnawing or burning, and coinciding with digestion. nausea, emesis, and anorexia are uncommon.
1. where does the burning sensation occur in heartburn?
2. which factors lead to heatburn?
3. what is the use of antiacids?
4. what are the symptoms of peptic ulcer?