FALLACY PAGE

— Post hoc ergo propter hoc —

Fallacy definition (short name: post_hoc)

Definition

From Wikipedia1:

Post hoc ergo propter hoc, Latin for “after this, therefore because (on account) of this”, is a logical fallacy (of the questionable cause variety) which states, “Since that event followed this one, that event must have been caused by this one.” It is often shortened to simply post hoc and is also sometimes referred to as false cause, coincidental correlation or correlation not causation.

Canonical example

From Purdue2:

I drank bottled water and now I am sick, so the water must have made me sick.

1 Wikipedia notice for this fallacy

2 Purdue OWL

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