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BACKGROUND The long-term incidence of chronic postsurgical pain (CPSP) after thoracic surgery has not yet been reported. METHODS We retrospectively reviewed the electronic medical records of 4218 consecutive patients who underwent thoracic surgery for lung cancer between 2007 and 2016. We evaluated the long-term incidence of CPSP after thoracic surgery at intervals of 3 months for 36 months. A Cox proportional hazard regression analysis was performed to investigate the predictors of CPSP after thoracic surgery. RESULTS A total of 3200 pa