Q.Why is pneumonia considered as a dangerous disease?

Pneumonia inflames and fills the alveoli with fluid, severely reducing the lungs' gas-exchange surface, so oxygen uptake fails and the condition can become life-threatening.

Pneumonia is an infection of the lung tissue, most often caused by bacteria (e.g., Streptococcus pneumoniae), viruses, or fungi, that inflames the alveoli (the tiny air sacs where gas exchange occurs).

During pneumonia, the alveoli become inflamed and fill up with fluid, mucus and pus instead of air. This has several serious consequences:

• The surface area available for oxygen and carbon dioxide exchange is drastically reduced, since fluid-filled alveoli cannot exchange gases efficiently.
• The diffusion distance for oxygen across the alveolar wall increases (thickened, fluid-laden membrane), further slowing gas exchange.
• The patient experiences difficulty breathing, low blood oxygen levels (hypoxia), fever, chest pain and cough. …

Pneumonia is dangerous because it fills the alveoli with fluid or pus, drastically reducing the surface available for oxygen to diffuse into the blood, which can lead to severe hypoxia, respiratory failure, and even death if not treated promptly.

Pneumonia is an infection (commonly caused by bacteria such as Streptococcus pneumoniae, though also by viruses or fungi) of the lung tissue, particularly the alveoli — the tiny air sacs where gas exchange with the blood normally takes place.

Why it is considered dangerous:

1. Impaired gas exchange: as the infection progresses, the alveoli fill up with fluid, mucus and pus (inflammatory exudate) instead of air, drastically reducing the surface area available for O2 to diffuse into the blood and CO2 to diffuse out. This lowers blood oxygen levels (hypoxia).
2. Risk of respiratory failure: in severe cases, the impaired gas exchange can become so extensive that the person cannot maintain adequate blood oxygen levels on their own, leading to respiratory failure requiring hospitalisation/oxygen support/ventilation. …