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Post Hoc Fallacy
Also known as: After this, therefore because of this
Learn the post hoc fallacy, also called post hoc ergo propter hoc, and how LogicLens can help readers notice unsupported cause-and-effect leaps.
What it means
A post hoc fallacy assumes that because one event happened before another, the first event caused the second.
Why it matters
Timeline-based claims are common in news and politics. Without evidence of causation, sequence alone can create a misleading story.
LogicLens helps readers detect and review signals associated with post hoc fallacy and many related article-level patterns, including weak reasoning, loaded wording, missing context, framing, sourcing gaps, and manipulative persuasion.
Common signs
- The argument depends mostly on timing.
- Other possible causes are ignored.
- No mechanism or evidence connects the events.
Example
A pundit says a new mayor caused a drop in crime because crime fell after the mayor took office.
Reader check
Ask what else changed and whether there is evidence beyond the timeline.
FAQ
What is Post Hoc Fallacy?
A post hoc fallacy assumes that because one event happened before another, the first event caused the second.
Can LogicLens help detect post hoc fallacy?
LogicLens is built to help readers detect and review signals associated with this pattern and related forms of weak reasoning, loaded wording, missing context, framing, and manipulative persuasion in online content.
How do I spot post hoc fallacy while reading?
Ask what else changed and whether there is evidence beyond the timeline.