Why Does My Mouth Taste Bitter?

GERD or acid reflux

Gastroesophageal reflux disease (GERD) or acid reflux may be the source of an unwanted bitter taste in the mouth.These conditions occur when the muscle or sphincter at the top of the stomach becomes weak and allows acid or bile to rise up into the food pipe.GERD tends to irritate the food pipe, causing a burning sensation in the chest or abdomen. It can also bring about a foul or bitter taste in the mouth, which may persist as long as the other symptoms.