Why is pneumonia so dangerous? – Eve Gaus and Vanessa Ruiz

Pneumonia is an inflammation of the air sacs in the lungs (alveoli) and the surrounding tissue. It often leads to a sudden high fever, the feeling that you are very unwell, a cough and shortness of breath.
Because pneumonia is usually caused by bacteria, it can generally be treated effectively with antibiotics. Vaccinations that can prevent infection by certain germs are also available.
People who are otherwise in good health generally recover within a few weeks. But pneumonia shouldn’t be taken too lightly: it can last one or sometimes even several months until you are back to full strength.
Pneumonia may sometimes have life-threatening complications, especially if you have already been weakened by another illness. Pneumonia can also be dangerous for babies and older people.ypical signs of pneumonia are:
High fever and chills
Physical weakness and a strong feeling that you are unwell
Cough with phlegm (sputum)
Shortness of breath and rapid breathing
Racing pulse
The symptoms don’t always all occur at the same time. Particularly children and older people may not show some symptoms, or other, less typical symptoms such as diarrhea, stomach pains or drowsiness and confusion might be more noticeable.
https://www.ncbi.nlm.nih.gov/books/NBK525774/