Indigestion is described as stomach pain and discomfort caused by difficulty digesting food. Indigestion is often referred to as dyspepsia. It is a term used to describe stomach pain. Indigestion causes burning or discomfort in the upper part of the stomach, as well as an unpleasant feeling in the abdomen. Indigestion is not a medical condition. However, it may be a symptom of other digestive disorders. Some of the symptoms are stomach ache, vomiting, and fatigue. A burning feeling in the mouth, abdomen, or stomach, trouble swallowing, weight loss, gas formation, and so on.