Abstract:Globally, the COVID-19 pandemic has triggered a dramatic increase in cases of olfactory dysfunction. At present, the treatment of olfactory dysfunction faces multiple challenges, including the lack of uniform treatment standards, the risk of drug resistance to long-term use of steroids and other drugs, and irreversible damage caused by endoscopic sinus surgery. Essential oils and their volatile components have anti-inflammatory, antiviral and other biological activities, contributing to the recovery of olfactory function. In addition, the special activity of essential oils can further enhance the regeneration ability of the olfactory nerve. This article summarizes the mechanisms of odor perception and the clinical etiology of olfactory dysfunction: the mechanisms of olfactory dysfunction mediated by COVID-19, neurodegenerative diseases and rhinitis mainly include viral infection, inflammation and acetylcholinesterase hyperactivity. On this basis, the possibility of essential oils in the treatment of olfactory dysfunction is explored from the perspective of different biological activities, and its clinical application prospects are discussed in detail from the perspective of essential oils delivery, aiming to provide clear and in-depth insights in the field of olfactory dysfunction treatment.