Pneumonia may be caused by an infection or injury of the lungs.
If fluid builds up within the lung tissue , it is called pneumonia.
Fluid build up in the lung tissue may be caused by infection or injury of the lungs.
what might infection or injury of the lungs cause?

a: decrease stamina
b: death and devastation
c: a lot of human deaths
d: stomach
e: destroying life
f: good health
g: h2o vapor
h: lung tissue fluid build up