The twisting sound is a very fine and uniform chest auscultation sound, which is heard at the end of inspiration. The sound is similar to the sound produced by twisting a strand of hair with a finger next to the ear, so it is called twisting. It is generally believed that the twisting sound is a small rupture sound produced by the airflow when the alveoli, which are unexpanded or slightly increased in fluid and bonded to each other, are ruptured during inspiration. It can occur in early tuberculosis, early pneumonia, pulmonary bruising, and fibrosing alveolitis. It is a kind of bursting sound caused by the presence of mucous secretion in the bronchi or swelling of the bronchial mucosa, resulting in the adhesion of the fine bronchi together, which is sharply separated by the airflow. It is similar to the sound produced when twirling a tuft of hair in the ear, hence the name. The sound is characterized by short, fragmented, intermittent, and equal in size. It is common in the early stages of alveolar inflammation, pulmonary congestion and edema, and incomplete expansion of the lungs with incomplete alveolar obstruction. Diagnosis is mainly based on: clinical manifestations, examination of wound secretions and X-ray examination. If, after injury or surgery, there is unusual pain in the wound, rapidly increasing local swelling, twisting of the skin around the wound, and severe systemic signs of toxicity, such as accelerated pulse, irritability progressive anemia, the possibility of gas gangrene should be considered. The presence of a large number of gram-staining positive bacilli on smear examination of secretions within the wound and the presence of gas between the wound muscles on X-ray are three important bases for the diagnosis of gas gangrene. Although anaerobic bacterial culture and pathologic biopsy can affirm the diagnosis, they require some time, so we cannot wait for their results to avoid delaying treatment.