A sign that does not appear in pneumothorax is an increased fibrillation, which is usually diminished or disappeared in pneumothorax. When a pneumothorax is present, the percussion sounds will show a drum sound, and the breath sounds will be weakened or disappear on auscultation, and the fibrillation will be weakened or disappear when the fibrillation is examined at this time. If a small amount of pneumothorax can be treated conservatively, the pneumothorax can be cured by oxygen absorption after rest. If the amount of pneumothorax is greater than 30%, closed chest drainage should be performed to drain the gas out of the chest cavity to relieve the symptoms of chest tightness, shortness of breath and difficulty in breathing.