Pneumothorax is a common medical emergency. After suffering from a pneumothorax, symptoms often include chest tightness, difficulty breathing, and coughing. Regarding lung auscultation by a doctor after pneumothorax, the sound heard primarily depends on the amount of air accumulated. If the air accumulation is minimal, the physical signs may not be obvious. If there is a substantial amount of air, the breathing sounds during auscultation are reduced. In cases of a large pneumothorax, the breathing sounds may disappear, while on the healthy side, the breathing sounds may be coarser and intensified. Therefore, if pneumothorax is suspected during a lung auscultation examination, an immediate imaging test should be conducted to confirm the diagnosis.