Hearing loss and other auditory problems are strongly associated with Covid-19 according to a systematic review of research evidence led by University of Manchester and NIHR Manchester Biomedical Research Centre (BRC) scientists.

Professor Kevin Munro and PhD researcher Ibrahim Almufarrij found 56 studies that identified an association between Covid-19 and auditory and vestibular problems. They pooled data from 24 of the studies to estimate that the prevalence of hearing loss was 7.6%, tinnitus was 14.8% and vertigo was 7.2%. 

However, the team – following up their review carried out a year ago – described the quality of the studies as fair. Their data primarily used self-reported questionnaires or medical records to obtain Covid-19-related symptoms, rather than the more scientifically reliable hearing tests.

The study was funded by NIHR Manchester Biomedical Research Centre (BRC). Kevin Munro, Professor of Audiology at The University of Manchester and Manchester BRC Hearing Health Lead said:

There is an urgent need for a carefully conducted clinical and diagnostic study to understand the long-term effects of Covid-19 on the auditory system.

It is also well-known that viruses such as measles, mumps and meningitis can cause hearing loss; little is understood about the auditory effects of the SARS-CoV-2 virus.

Though this review provides further evidence for an association, the studies we looked at were of varying quality so more work needs to be done.

Professor Munro is currently leading a year-long UK study to investigate the possible long-term impact of Covid-19 on hearing among people who have been previously treated in hospital for the virus.

His team hope to accurately estimate the number and severity of Covid-19 related hearing disorders in the UK, and discover what parts of the auditory system might be affected.

Note: The findings were published in the International Journal of Audiology.