Lung pathologies usually cause hypoxia and<unk>  if left untreated. A chest x ray is the most important tool to evaluate such conditions. It can be very helpful in identifying various lung lesions and infections.
Confusion chest x ray
Solitary pulmonary nodule x ray
Atelectasis chest x ray
Hamman-Rich syndrome chest x ray
Cyanosis chest x ray
Pleural friction rub
Subcutaneous emphysema
Chest pain other imaging findings