If the patient’s left chest appears like a fork in the air when breathing, the following diseases should be considered: 1. Respiratory diseases should be considered, such as the patient’s pneumothorax, such as tension pneumothorax, traffic pneumothorax, and open pneumothorax, which will have the symptom of pain in the left chest along with breathing and like a fork in the air. 2. It is necessary to consider whether the patient’s chest has suffered from trauma and resulted in a fracture of ribs, or the surrounding soft tissues have developed a Contusion, soft tissue injury, there will also be breathing with the chest like fork in the air symptoms. 3, for some respiratory infections, such as massive pneumonia, pleural effusion and other conditions will also have the above performance. 4, for cardiac diseases, such as coronary artery disease, myocarditis, pericarditis, cardiac valvular disease and other conditions, there will also be with breathing with the left chest after the appearance of the symptoms of like fork in the air uncomfortable.