Acute pharyngitis

Common cold

Flu (Influenza)

Infectious mononucleosis (glandular fever)

ARDS

Acute bronchitis

Pneumonia

Aspiration pneumonia

Lung abscess

Tuberculosis

Pneumothorax

Pulmonary embolism

Methemoglobinemia

Asthma

Acute asthma

COPD

Acute exacerbation of COPD

Pleural effusion

Lung fibrosis

Idiopathic pulmonary fibrosis