Abstract:Abstract Objective The purpose of this study was to determine whether BDNF can be used to determine the efficacy of tinnitus, and the relationship between BDNF rs 6265 (Val66Met) gene polymorphism and peripheral blood BNDF concentration. Methods The level of BDNF and its gene polymorphism in 30 patients with tinnitus (control group) and 30 healthy controls (control group) were measured (rs 6265 Val66Met). The severity of tinnitus was assessed using the tinnitus disability assessment scale (THI). The tinnitus patient was divided into two groups according to the THI score: mild disability (CD36) and moderate to severe disability (Sup38). All patients were treated with transcranial magnetic stimulation. To study the relationship between the level of tinnitus and the concentration of brain-derived neurotrophic factor in patients with tinnitus, disability assessment scale (THI) score and plasma brain-derived neurotrophic factor concentration. Result The serum BDNF concentration in the patients with tinnitus was lower than that in the healthy control group (p <0.05). The level of BDNF in the treatment of patients with tinnitus was higher than that before treatment (p <0.05). In the patients with tinnitus and the healthy control group, there was no significant correlation between the gene polymorphism of BDNF (rs 6265 Val66Met) and the serum BDNFconcentration. The serum BDNF concentration of patients was lower than that of healthy controls, and the difference was statistically significant. The difference between the two may be due to changes in auditory cortical plasticity in patients with tinnitus and different expression of BDNF genes in different tissues and pathologies. The concentration of serum BDNF in patients with effective tinnitus treatment was significantly higher than that before treatment, which was statistically significant. The serum BDNF concentration in patients with ineffective tinnitus treatment was not significantly changed before and after treatment, so there was no statistical significance. Conclusions The concentration of BDNF is correlated with the prognosis of tinnitus, and BDNF may be involved in the occurrence of tinnitus disease through the mechanism of neuroplasticity. Therefore, it is speculated that serum BDNF concentration can be used as one of the objective indicators of tinnitus efficacy.