Chen et al(Chen, Zhao, and Qiu 2019) from Anhui Medical University carried out a meta-analysis on the effect of acupuncture to treat sudden sensorineural hearing loss (SSNHL). The analysis included 1423 individual cases from PubMed, EMBASE, Cochrane Library, China National Knowledge Infrastructure, and WanFang databases. They concluded that acupuncture could be a valid treatment option for SSNHL, especially for patients who could not be cured by drugs alone.
Chen, Shanwen, Mei Zhao, and Jianxin Qiu. 2019. “Acupuncture for the Treatment of Sudden Sensorineural Hearing Loss: A Systematic Review and Meta-Analysis.” Complementary Therapies in Medicine, February, 381–88. https://doi.org/10.1016/j.ctim.2018.12.009.