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Purpose: The aim of this study was to investigate the short- and long-term effects of a new cognitive sound exposure therapy (CSET) in patients with hyperacusis. Method: A new therapy was developed to reduce hyperacusis using sound exposure combined with breathing and relaxation strategies from both accep- tance and commitment therapy and cognitive behavioral therapy. Patients who were referred to the Speech and Hearing Centers located in Hengelo and Zwolle in the Netherlands and aged ≥ 18 years with hyperacusis as main complaint and no or mild hearing loss were included in this study. Patients were seen for CSET between June 2020 and August 2022. The sessions took place biweekly. Sessions ended when exposure reached a level with a maximum of 70--80 dB SPL. Short-term effects between the start and the end of therapy were based on tolerable level of sound exposure (dB SPL), subjective-level hinderance of hypera- cusis, and sensitivity to sound using the Hyperacusis Questionnaire (HQ). The long-term effect was based on HQ 6 months after the end of therapy. Linear mixed-effects and regression models were applied to study outcomes over time. Results: In total, 30 patients, 15 men and 15 women, aged between 24 and 76 years were included in this study. The mean number of sessions during ther- apy was 6 and ranged between 4 and 8. Results showed an increase of exposure level (mean change was +23.7 dB with an SD of 7.9, p< .001), a decrease in sensitivity to daily sounds (mean [SD] change was -1.6 [2.1], p<.001),anda decrease in HQ (mean [SD] change was -9.8 [4.9], p< .001), between the start and the end of therapy. There was no significant change in HQ after the end of therapy and 6 months later; mean (SD) change was 0.2 (4.3), p=.81. Conclusions: The evaluation of CSET indicated a decrease in short- and long- term sensitivity to sound in patients with hyperacusis. Additionally, CSET has shown a positive impact, not only for the sounds used in the therapy sessions but also in transferring benefits to everyday sounds. The results of combining psychoeducation, sound exposure, and counseling are promising and warrant further evaluation. [ABSTRACT FROM AUTHOR]