The main clinical manifestation of esophageal cancer is eating obstruction, and the obstructive symptoms are more obvious when the disease progresses to advanced stage. The specific manifestations are as follows: 1. If the tumor grows into the cavity, it is mostly manifested as eating obstruction and difficulty in swallowing, which affects eating; 2. If the tumor grows out of the cavity, the eating obstruction is not obvious, and it is mostly manifested as vomiting blood; 3. Obvious wasting: mostly caused by insufficient nutritional intake; 4. Chest and back pain: due to local infiltration and invasion; 5. Organ metastasis of esophageal cancer: such as metastasis to liver, anorexia and ascites may appear.