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The literature on insight lists four main characteristics of this experience: (a) suddenness (the experience is surprising and immediate), ease (the solution is processed without difficulty), positive affect (insights are gratifying), and the feeling of being right (after an insight, problem solvers judge the solution as being true and have confidence in this judgment). Although this phenomenology is well known, no theory has explained why insight feels the way it does. We propose a fluency account of insight: Positive affect and perceived truth and confidence in one’s own judgment are triggered by the sudden appearance of the solution for a problem and the concomitant surprising fluency gain in processing. We relate earlier evidence on insight concerning the impact of sudden fluency variations on positive affect and perceived truth and confidence.