Two systematic reviews — a 2023 PMC summary of 55 studies and a 2024 American Journal of Surgery review — place cosmetic surgery regret at roughly 5—33% depending on procedure type: breast augmentation sits at the low end (5—9%), body contouring at the high end (11—33%). Neither review computes a single cross-procedure average, so we estimate ~10% as a conservative midpoint for elective cosmetic procedures. On the inaction side, no large-sample survey directly measures regret about not having cosmetic surgery. General body-dissatisfaction data (37% of Americans per Ipsos) and cosmetic-consideration rates (70% per ASDS) suggest that a non-trivial minority of non-patients harbor lasting appearance regret, but the 5% inaction estimate is a constructed proxy, not a survey finding.
The pattern runs counter to the classic Gilovich finding. For most life decisions, inaction regret dominates over time: people regret the degree not pursued, the trip not taken, the relationship not attempted. Cosmetic surgery inverts this because the action is irreversible, physically invasive, and financially costly. A rhinoplasty that narrows the bridge too aggressively cannot be fully undone; a breast augmentation that causes capsular contracture is a daily reminder. Both systematic reviews identify inadequate pre-operative education and postoperative complications as the strongest predictors of regret — suggesting that the action-regret rate is substantially reducible through better screening and counseling.
The main caveat is the asymmetry of evidence. The action side has genuine peer-reviewed systematic reviews with procedure-specific breakdowns. The inaction side has essentially nothing: body dissatisfaction surveys measure a different construct, and ASDS consideration rates conflate casual curiosity with genuine surgical intent. If a rigorous survey ever asks a representative sample of non-patients “Do you regret not having cosmetic surgery?”, the true figure could be higher or lower — and the direction of the Gilovich pattern could flip. Until then, the delta (0.05) should be read as roughly balanced with a slight tilt toward action regret, not as a precise quantitative claim.