Most usual symptom is burning sensation behind the breastbone. Sometimes it can be very mild, sometime it can become so painful that it could be hard to concentrate on anything else but pain.
Another one is burping, belching and other unpleasant things. I found that it has close connection to how nervous you are. But there are certain kinds of foods which guaranteed to give you this (like soft drinks).
Sour taste in your throat. Usually this symptom occurs in the morning. If you experiencing this symptom every morning and taste is really sour it is time to do something about your heartburn.
Because next step is nightime heartburn. If you have it - then your heartburn is in very bad stage and you have to work hard to put it under control.
Sore throat. This is a tricky one since it is very easy to confuse it with cold. Only ENT doctor can really say what causes it.
Swallowing difficulties. This one is pretty scary. If your heartburn causing you swallowing problems run to the doctor now. This symptom could be a sign of something serious. Usually based on this symptom your family doctor will refer you to gastroenterologist who will perform an endoscopy.
Chest pain. Very confusing one. But if you have this symptom it does makes sense to consult with your doctor. It is better to make sure that it is not a problem with your heart than have unpleasant surprises later.
Other conditions and treatments pages:
Get more information about hiatal hernia and heartburn.
We're also building a comprehensive resource for heartburn information. We'll put a link here once it will get complete.