An uncomfortable, often painful feeling in the stomach, resulting from impaired digestion. Symptoms include burning stomach pain, bloating, heartburn, nausea, and vomiting. Causes include gastritis, gastric ulcer, gastroesophageal reflux disease, pancreatic disease, and gallbladder disease. The disease is dyspepsia (MONDO_0002268). Also known as: dyspepsia, indigestion, indigestion.