Ghazavi H, et al. - In this cross-sectional study involving 34 sudden sensory-neural hearing loss (SSNHL) patients 34 healthy individuals without risk of hearing loss, researchers analyzed vitamin D levels and its impact on response to treatment. All patient information like age, gender, audiogram illustration of hearing frequency and vitamin D level have been recorded at baseline. According to the audiometry, SSNHL patients received routine treatments like 10 days of 1 mg/kg/day steroid and the response or lack of complete response to treatment was recorded and analyzed. In patients with SSNHL, the prevalence of vitamin D deficiency was more than healthy people. The highest percentage of patients with SSNHL deficient vitamin D did not respond to treatment. Factors like age, gender and level of initial hearing loss did not have a significant impact on the response to treatment, although the level of vitamin D in these individuals had a significant connection with the response to treatment.