Which illnesses are considered lower respiratory tract infections?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Lower respiratory tract infections are illnesses that affect the lower respiratory tract, which consists of the trachea, bronchi, and lungs.1

Several significant respiratory conditions fall into this category:

  • Pneumonia: This involves inflammation and consolidation of lung tissue, typically caused by bacteria, viruses, or fungi. It includes various forms such as streptococcal, mycoplasmal, and viral pneumonia.23
  • Acute Bronchitis: Often resulting from a viral infection, this condition involves inflammation and congestion of the bronchial tree.4
  • Pulmonary Tuberculosis: A serious bacterial infection that primarily affects the lungs, causing inflammation and potential tissue damage.5

These infections are distinct from those affecting the upper respiratory tract, such as the common cold. If you are experiencing symptoms like persistent cough, difficulty breathing, or high fever, it is essential to seek professional medical evaluation to ensure an accurate diagnosis and appropriate treatment.26