Pneumonia

Pneumonia is a symptom, and it is found VERY COMMON. It can lead to death if you are old. 
== Cures ==
There are cures. One of a kind is a mask, but not MarshmelloXD mask. Sorry Marshy, but it does NOT relate to face mask. Now no deadmau5, just resume. Anyway, pneumonia is an infectious thing.
Category:Death causes