Chest adhesions are mostly a series of symptoms left behind when pleural effusion is present. Pleural effusion caused by a variety of reasons, the pleural effusion contains fibrin-like substances, which are deposited in the pleural cavity because the pleural effusion cannot be absorbed in time or exists for a long time. Long-term fibrin deposition will form adhesions of fibrin, mechanization, and pleural hypertrophy, which will stick the dirty and wall layers of the pleura together, and chest adhesions will be formed. The most important symptom of thoracic adhesions is pain when breathing. If a patient has an existing pleural effusion, and after a period of time, the pleural effusion is absorbed, and then pain during breathing and other symptoms occur, one should suspect whether chest adhesions have occurred, and should promptly perform chest CT and other examinations to clarify the diagnosis.