Incomplete cure of pneumonia may lead to exacerbation of lung infection, production of pleural effusion, and in severe cases, life-threatening. 1. Exacerbation of lung infection: exacerbation of pneumonia may cause necrosis of lung tissues, lung cavities, lung abscess, pyothorax and so on. It leads to aggravation of lung infection and even life-threatening infectious shock. 2. Pleural effusion: pleural effusion is often manifested as exudate, medium-large amount of pleural effusion leads to lung compression and atelectasis, and the patient suffers from dyspnea, respiratory failure, etc., which is life-threatening in severe cases. It is recommended that patients with pneumonia need to be treated thoroughly, patients should follow the doctor’s instructions, so as to avoid incomplete treatment induced serious lesions.