Abstract From 2001 to 2005, 66 patients referred for perioperative hyperbaric oxygen therapy (HBO2 ) for debridement of necrotic tissue or prevention of radionecrosis were assessed with quality of life measures, before and after completion of HBO2 and surgery. The Medical Outcomes Short Form 36 (SF-36) and Hospital Anxiety and Depression Scale (HADS) showed no significant changes. The European Organisation for Research and Treatment of Cancer Core (EORTC-C30) questionnaire showed significant improvement in pain, global health, and dyspnoea ( p = 0.011; p = 0.027; p = 0.008, respectively). The Head and Neck sub-module (H&N35) identified significant improvements in teeth, dry mouth and social contact ( p = 0.002; p = 0.038; p = 0.029, respectively). The University of Washington Scale (UW), showed significant changes in relation to chewing and shoulders ( p = 0.031; p = 0.047). When sub-group analysis using ‘osteoradionecrosis’ and ‘dental extraction or implants’ was performed on the EORTC and UW data, variations in the patterns of significance were found. Adjunctive HBO2 should be considered for the treatment and prevention of some of the long-term complications of radiotherapy.