The article discusses lower respiratory tract infection (LTRI), its causes and treatment. It describes LTRI as occurring below the larynx and most commonly affects the very young and elderly. The different types of LTRI are described, including the methodology of treatment, which includes the prescription of antibiotics, the use of oxygen in severe cases, and giving up smoking. It explains that LTRI can lead to other health problems, including pneumonia. It also describes individuals who are at risk of hypercapnic respiratory failure.