Loss of sense of smell is also known as olfactory loss, which can occur for many different reasons.
Common reasons for olfactory loss are sinusitis, nasal allergy, and respiratory viral illnesses. Olfactory loss is much more common with COVID-2019 than with other types of respiratory viral illnesses. Less common reasons for olfactory loss include head injury, sinus or nasal tumors, medications, and toxins. Olfactory loss can be the first sign of neurological diseases, such as Alzheimer or Parkinson disease.
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Patel ZM. Olfactory Loss and Olfactory Training. JAMA Otolaryngol Head Neck Surg. Published online July 15, 2021. doi:10.1001/jamaoto.2021.1507
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