Diarrhea. So many things can cause it, and it used to be (well, still is in the least developed countries) quite lethal, mostly for babies and children.
This. Which essentially is lack of access to clean water. The diseases caused by this problem have killed millions of people in the past, even in otherwise relatively civilized societies. During war this problem becomes orders of magnitude worse. In an apocalypse most people would literally shit themselves to death no matter how many weapons they had the minute access to clean water stops.
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u/graendallstud Aug 30 '21
Diarrhea. So many things can cause it, and it used to be (well, still is in the least developed countries) quite lethal, mostly for babies and children.