Acid reflux is a very unpleasant and uncomfortable condition that often causes a burning sensation in the chest and throat. The feeling is often described as a hot, sour, or bitter taste in your mouth. It can also cause difficulty swallowing, coughing, chest pain, and nausea.  Many people describe feeling a sense of discomfort or pressure in their upper abdomen. They may also experience bloating or a feeling of being overly full.  The symptoms of acid reflux can be so severe that they interrupt people's daily activities, making it difficult to work, sleep or eat comfortably. In some cases, it can even cause significant anxiety or depression due to the severity of the symptoms.