Tehran University of Medical Sciences Auditory and Vestibular Research 2423-480X 23 4 2017 07 31 40 48 Mojtaba Tavakoli Musculoskeletal Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran Hossein Talebi Department of Audiology, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran Sahar Shomeil Shushtari Musculoskeletal Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran Neda Mazahery Tehrani Department of Optometry, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran Soghrat Faghihzadeh Department of Biostatistics, Tarbiat Modarres University, Tehran, Iran 2017 05 21 Background and Aim: Diabetes mellitus is a metabolic disorder that affects multiple systems including the auditory and vestibular systems. Patients with diabetes mellitus complain of tinnitus and dizziness. The objective of this study is to assess the effects of diabetes mellitus types I and II on auditory and vestibular systems. Methods: We compared pure-tone audiometric results and cervical vestibular evoked myogenic potentials (cVEMPs) between 15 patients with diabetes mellitus type I (43.80 with SD 4.246), 15 patients with diabetes mellitus type II (48.13 with SD 2.973), and 10 normal volunteers (45.30 with SD 4.448). Age range of the participants was 40-50 years old. Results: Audiometric results showed normal hearing in both types of diabetes mellitus. In contrast, comparing amplitude of cVEMPs between diabetes mellitus and control groups showed statistically significant differences (p<0.05). Conclusion: In spite of normal audiometric results in patients with diabetes mellitus types I and II, there was abnormal vestibular responses involving vestibular end-organ and related central pathway. https://avr.tums.ac.ir/index.php/avr/article/view/232