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COVID-19 can cause lasting smell loss, even without initial symptoms, affecting most patients two years later.
A large NIH-led study of 3,535 adults found that COVID-19 can cause long-term smell impairment, even in people who didn’t notice issues initially.
Two years after infection, 80% of those who reported smell changes scored poorly on a standard smell test, with 23% severely affected or unable to smell.
Shockingly, 66% of those with no reported symptoms also had abnormal test results.
The study, the largest using objective testing, shows hyposmia can persist unnoticed, affecting quality of life, safety, and mental health, and may signal early neurological decline.
Experts urge routine smell screening in post-COVID care and are testing treatments like olfactory training and vitamin A, though taste loss wasn’t assessed.
COVID-19 puede causar pérdida de olfato duradera, incluso sin síntomas iniciales, afectando a la mayoría de los pacientes dos años después.