Pneumonia Risk Factors and Types

Pneumonia is an acute respiratory infection that affects the lungs, especially the alveoli. These tiny air sacs normally help with oxygen exchange. When they fill with pus and fluid, breathing becomes harder, oxygen absorption drops, and chest pain or discomfort can occur during breathing.

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Pneumonia is a lung parenchymal infection that affects one or both lungs.

Risk factors for pneumonia include air pollution, smoking, corticosteroid and immunosuppressive therapy, stroke, prolonged immobility, inhalation or aspiration of toxic substances, tracheal intubation, abdominal or thoracic surgery, and structural lung disease.