The more common complications of chronic lung abscess are mainly as follows.1. It is common to have abscess chest and chronic lung abscess, mainly because the inflammation of acute lung abscess is not completely controlled in time, and the infection gradually develops into chronic and leads to obvious long-term exudation of inflammatory secretions from the lung mucosa. At this time, the exuded secretions are not eliminated in time and are not absorbed by the body itself, forming an abscess chest in the long term. Patients will have fever persisting and have symptoms of dyspnea. 2, pneumothorax, because the inflammation is more serious, the pathogen will invade the lung tissue mucosa, so that the pleural cavity rupture leads to the emergence of pneumothorax.