Lung abscess chest pain in the elderly is caused by inflammatory lesions involving the pleura, and the pain is aggravated during breathing. If the abscess breaks into the chest cavity, it can form an abscess chest, pneumothorax, or an encapsulated abscess chest due to fibrin wrapping, and the patient has restricted respiratory movements and increased shortness of breath. What are the examination methods of lung abscess? Laboratory tests 1. Blood tests In secondary infection, there may be an increase in white blood cell count and left shift of nucleus. In case of long duration of disease or serious hemoptysis, there may be anemia and increased blood sedimentation, etc. Sputum examination and sputum smear can detect Gram-positive and negative bacteria, and culture can detect pathogenic bacteria, and sputum culture can help to select sensitive antibiotics. Auxiliary examination 1.chest X-ray is the main diagnostic method of lung abscess. Since the abscess has the characteristic of spreading to different lobes, it can spread to multiple lobes or even the whole lung. 2.CT examination tomography (including CT) can better understand the scope, location and cavity of the lesion. A small number of abscesses with undrained pus show round block shadow, but there are small cavities within the visible, and not many of them are really solid blocks, which can be easily mistaken for tumors. Pulmonary volume reduction is evident in fibrosis, and complete bronchial occlusion may be present with pulmonary atelectasis. Interlobular pleural thickening may be seen. If the abscess breaks into the chest cavity to form a pus or pneumothorax, there are corresponding changes on the film. 3.Fiber bronchoscopy Fiber bronchoscopy is best performed when the patient’s condition is more stable, not when there is high fever and severe inflammation of the respiratory tract. 4.Bronchography Bronchial changes in lung abscess are quite obvious, and bronchography can understand the location and scope of lesions, and discover lesions that are not seen on plain film or not clear on tomography, which is helpful to determine the principle of treatment and surgical methods. The imaging can see dilated bronchus, filled pus cavity, distortion and deformation of bronchus, stenosis and bronchopleural fistula. 5.Pulmonary function test mainly shows obstructive ventilation disorder. In the late stage, there may be a decrease in arterial partial pressure of oxygen and a decrease in arterial oxygen saturation.