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Esophageal diseases frequently cause symptoms such as heartburn, epigastric pain and dysphagia. This article discusses the indications, techniques and limitations of currently available diagnostic procedures. Investigation of symptoms should proceed in a logical stepwise manner, beginning with endoscopy to exclude esophagitis or neoplasia. Symptoms due to acid reflux can be identified by 24h esophageal pH-metry to document a temporal association between symptoms and episodes of esophageal acidification. Stationary or ambulatory manometric recording of esophageal pressures can be used to diagnose esophageal motor disorders such as achalasia, nutcracker esophagus, diffuse esophageal spasm, or dysfunction of the upper or lower esophageal sphincter. Combined 24 h pH-manometry should be used to test the temporal association between pain, reflux, or abnormal motility in patients with non-cardiac chest pain. Video-fluoroscopy is the most appropriate technique to diagnose swallowing disorders. Pulmonary aspiration of gastro-esophageal reflux can be documented with scintigraphy.