Introduction. This study identifies the factors associated with the deterioration in the quality of life in patients with carpal tunnel syndrome (CTS). Materials and methods. A questionnaire with demographic and clinical variables, the EQ-5D and the Boston Carpal Tunnel Questionnaire with symptoms (BCTQ SSS) and functional (BCTQ FSS) subscales were applied to patients over 18 years of age with a diagnosis confirmed by electrodiagnostic studies. Results. The study involved 53 patients (71,7% women) with a mean age of 55,5 (± 13) years. The EQ-5D scores at baseline and 6 months were 0,55 (± 0,30) and 0,81 (± 0,23) respectively. The BCTQ SSS was 2,28 (± 0,78) and 2,05 (± 0,83) and BCTQ FSS was 2,29 (± 0,85) and 1,80 (± 0,76) to baseline and 6 months respectively. The domain of the EQ-5D showed higher proportion of patients (90,5%) in scores was to pain. Patients who received surgical treatment only showed better scores in the EQ-5D compared to those who received medical treatment (0,92 vs 0,77; P = 0,02). Factors associated with worse subjective assessments were rated severe in studies of nerve conduction velocity and classification of moderate in the domain of of daily living and in the EQ-5D. Conclusion. The impact on the quality of life is associated with impairment of activities of daily living, the presence of pain and evidence of major damage in the electrophysiological study.