Acute: * Cough * Difficulty Breathing * Abnormal lung sounds (wet or gurgling sounds when breathing) * Chest pain, tightness or burning sensation Chronic: * Persistent cough * Shortness of breath * Increased susceptibility to respiratory illness Symptoms of chronic<unk>  may or may not be present, and can take months or years to develop to the point of noticeability.
Chemical pneumonitis
Viral pneumonia
Atypical pneumonia
Acute bronchitis
Bacterial pneumonia
Hypersensitivity pneumonitis
Parasitic pneumonia
Radiation-induced lung injury