The symptoms of esophageal cancer generally include progressive difficulty in swallowing, because the esophagus itself is a tubular cavity, similar to a water pipe. Esophageal cancer typically forms a tumor within this tubular cavity, creating an obstruction. Consequently, the most common symptoms include difficulty swallowing and a sensation of blockage during eating, since food must pass through the esophagus. Other symptoms can include nausea, vomiting, acid reflux, heartburn, and pain below the breastbone. Moreover, the difficulty in swallowing generally worsens progressively, as the tumor grows from small to large, increasingly narrowing the esophagus and exacerbating the swallowing difficulties.