Yes it is bad. I know this personally. You need to see your doctor to see if you have acid reflux disease. Acid reflux is when the acid from your stomach comes up through the esophagus, and sometimes into the throat and mouth. Stomach acid is very powerful stuff, and it burns the tissues of the esophagus and throat. It can be totally prevented by taking one pill a day, if your doctor determines that acid reflux is what you have. In the meantime, buy yourself some Maalox. It coats the burned tissue and makes it feel a lot better.