Acid reflux isn’t pleasant. Symptoms of acid reflux include heartburn (a painful burning sensation in your abdomen, chest, or throat), regurgitation (acid backing up into your throat or mouth), and dyspepsia (burping, nausea, bloating, and abdominal pain/discomfort). If acid reflux occurs frequently and chronically, you may be diagnosed with gastroesophageal reflux disease, or GERD, which is a chronic digestive disease.