Most people with indigestion experience more than one of the following symptoms:Fullness during a meal: The person feels overly full soon after the meal starts and cannot finish the meal. Bothersome fullness after a meal: The person feels overly full after a meal-it may feel as though the food is staying in the stomach too long. Epigastric pain: The epigastric area lies between the lower end of the chest bone and the navel. The person may experience epigastric pain ranging from mild to severe. Epigastric burning:The person feels an unpleasant sensation of heat in the epigastric area.
Other, less frequent symptoms that may occur with indigestion are nausea and bloating-an unpleasant tightness in the stomach. Nausea and bloating could be due to causes other than indigestion.
Sometimes, the term indigestion is used to describe the symptoms of heartburn, but these are two different conditions. Heartburn is a painful, burning feeling in the chest that radiates toward the neck or back. Heartburn is caused by stomach acid rising into the esophagus and may be a symptom of gastroesophageal reflux disease (GERD). A person can have symptoms of both indigestion and heartburn.
This answer is based on source information from the National Institute of Diabetes and Digestive and Kidney Diseases