The short answer
Cognitive distortions are specific, recurring patterns of thinking that skew how a situation gets interpreted — not just "negative thoughts" in general, but distinct, nameable shapes that negative thinking tends to take. The concept originates with psychiatrist Aaron Beck's foundational work on cognitive therapy, and was later popularized for a general audience by his student, who catalogued roughly ten of the most common distortions with plain-language names and examples.
The research
The concept of cognitive distortions originates with psychiatrist Aaron Beck's foundational work on cognitive therapy, and was popularized for a general audience by his student David Burns, who catalogued roughly ten of the most common distortions with plain-language names and examples.
— David Burns, Feeling Good: The New Mood Therapy (building on Aaron Beck), 1980
The core patterns
All-or-nothing thinking
Collapsing a situation into two extremes (total success or total failure) with nothing counted in between.
Catastrophizing
Taking a plausible bad outcome and escalating it, step by step, to the worst possible version.
Mind-reading
Assuming you know what someone else is thinking, usually something critical, without evidence.
Fortune-telling
Predicting a negative outcome as though it's already decided, before anything has actually happened.
Mental filtering
Fixating on a single negative detail while filtering out everything else, including evidence that contradicts it.
Should statements
Holding yourself (or others) to a rigid, often unstated rule, then treating any deviation from it as a personal failure.
Labeling
Reducing a single mistake or moment to a fixed, global judgment about who you are ("I'm an idiot" instead of "I made a mistake").
Why naming them matters
Before Burns's book, most people experiencing distorted thinking had no vocabulary for what was happening beyond "I'm being negative" or "I'm overreacting." Giving each pattern a specific name — catastrophizing, mind-reading, all-or-nothing thinking — turned a vague mood into something identifiable in the moment, which is the first step CBT relies on: you can't work with a distortion you can't recognize as one.
They're patterns, not character flaws
These aren't mutually exclusive — a single thought ("they didn't reply, they're definitely mad, I always do this") can stack mind-reading, fortune-telling, and labeling in one sentence. Beck's original framing treated distortions as automatic, largely unconscious shortcuts the mind takes under stress — not evidence of poor character or low intelligence. That distinction matters clinically: the target of treatment is the pattern itself, not the person's overall way of thinking.
Want to see this pattern in your own thinking, not just in the research?
What actually helps
The traditional CBT approach is the thought record: write the distorted thought down, name the distortion, and write a more balanced alternative. It works, but it takes time and a level of composure that's hard to access in the exact moment a distortion is firing. A lighter-weight version — simply noticing and marking that a distortion just happened, without immediately trying to correct it — is a smaller, faster step that still builds the same underlying skill: recognizing the pattern as it occurs, rather than only in hindsight.