The most typical symptom of esophageal cancer is progressive difficulty swallowing, and a progressive sensation of swallowing obstruction is the most typical symptom. It's actually quite simple; the esophagus is akin to a water pipe or a tubular cavity. Esophageal cancer is like having a tumor grow inside this cavity, similar to something blocking the pipe, which causes the flow of water to be impeded. However, not only water passes through this esophagus, but also food. Therefore, if there's something inside the cavity, both water and food cannot pass through, leading to this difficulty swallowing and discomfort while swallowing.