What is pneumonia?
Pneumonia is a respiratory infection that affects the lungs, causing inflammation and fluid accumulation in the air sacs (alveoli). Various microorganisms, including bacteria, viruses, and fungi can cause this condition. When the alveoli become filled with fluid or pus, or when pleural effusion occurs, it can lead to difficulty breathing, coughing, and decreased oxygen exchange in the lungs.
Pneumonia can range from mild to severe and can be particularly dangerous for certain high-risk groups, such as infants, older adults, and individuals with weakened immune systems or chronic health conditions. The severity of the infection depends on factors such as the type of pathogen causing the infection, the patient's age, and overall health status.
Common signs and symptoms of pneumonia include (National Heart, Lung, and Blood Institute, 2022):
- Cough (may produce mucus)
- Fever and chills
- Shortness of breath or rapid breathing
- Chest pain that worsens with breathing or coughing
- Fatigue
- Nausea, vomiting, or diarrhea (more common in children)
- Confusion (more common in older adults)
When left unchecked, pneumonia can lead to complications such as secondary infection or even respiratory failure. Healthcare practitioners play an important role in assessing patients, initiating appropriate interventions, and educating patients and their families about the condition and its management.










