<unk>  must be differentiated from other diseases that cause shortness of breath, difficulty breathing, and chest pain, such as [differential dx1], [differential dx2], and [differential dx3].
Upper airway
Lower airway
Spirometry
Pneumothorax differential diagnosis
Hemothorax differential diagnosis
Pneumomediastinum differential diagnosis
Pleural effusion differential diagnosis
Air embolism differential diagnosis
Hemothorax risk factors
Lung abscess differential diagnosis
Farmer's lung differential diagnosis