Esophageal manometry is a test to measure the strength and function of the swallowing muscles of your esophagus (“food pipe”) and the sphincter muscles forming the barrier between your esophagus and your stomach. This is often performed when patients experience difficulty swallowing (dysphagia) or chronic acid reflux symptoms. In these cases, checking how the esophageal muscles and sphincters (valves) are working can be helpful in making a diagnosis and a treatment plan.