Pulmonary embolism itself does not cause pneumonia; however, during the treatment of pulmonary embolism, procedures such as oral tracheal intubation and the creation of an artificial airway might be employed. These can lead to nosocomial infections of iatrogenic origin, resulting in pneumonia.

Pulmonary embolism often manifests as unexplained respiratory difficulty, pleuritic pain, tachycardia, and decreased oxygen saturation. Other high-risk factors include being over the age of 40, having a history of DVT (Deep Vein Thrombosis), obesity, prolonged immobilization, stroke, congestive heart failure, malignancy, lower limb fracture, anesthesia time exceeding 30 minutes during surgery, pregnancy and childbirth, use of estrogen, and a hypercoagulable state. These are all potential high-risk factors for pulmonary embolism.