TNF and hearing loss disorder: Four studies found significant differences regarding TNF-α values, and in 3 studies TNF-α was higher in SSNHL compared to healthy controls with no history of hearing loss: 4.11 ± 0.91 pg/mL vs. 1.16 ± 0.31 pg/mL [15]; 15.8 ± 9.3 pg/mL vs. 12.4 ± 8.7 pg/mL [20]; 24.1 ± 3.7 pg/mL vs. 14.4 ± 1.7 pg/mL [22]; in one case [14] the TNF-α marker was higher in the control group 12.2 ± 7.9 pg/mL compared to SSNHL 11.4 ± 1.2 pg/mL.