Dyspepsia, also known as indigestion, is a term that describes discomfort or pain in the upper abdomen. It is not a disease. The term refers to a group of symptoms that often include bloating, discomfort, nausea, and burping. In the majority of cases, indigestion is linked to eating or drinking. It can also be caused by infections or the use of certain medications. The sensation generally occurs soon after consuming food or drink. It may make a person feel full or uncomfortable during a meal, even if they have not eaten a large amount of food. Symptoms may include upper abdominal fullness, heartburn, nausea, belching, or upper abdominal pain. People may also experience feeling full earlier than expected when eating.