The location between the two chests is the sternum, the posterior part of the sternum, including the mediastinum, which contains the trachea, esophagus and aorta. If there is pain or foreign body sensation between the two chests, it may be mediastinal tumor, which may cause local compression symptoms after the mediastinal tumor grows up, and may cause pain and difficulty in eating. If the patient has esophageal cancer, it may manifest as localized narrowing of the esophagus, difficulty in swallowing and choking sensation. Generally, the choking sensation may change when eating normal food in early stage, and may occur when eating semi-liquid or liquid food in advanced stage of tumor. If necessary, barium meal or gastroscopy will be performed to clarify the situation. After clarification, if surgery is possible, surgical resection is required.