Olfactory Dysfunction and Hallucinations Following Vaccination
A 39-year-old veteran, with a history of tension-type headaches, noticed a burning odor sensation approximately three weeks after receiving the J&J COVID-19 vaccine, about four months prior to his visit to the neurology clinic. Concerned about this peculiar symptom, he underwent a nasal swab antigen COVID-19 test, which returned negative. Initially, the episodes occurred daily, lasting about one hour each time. However, as time passed, they became less frequent, shorter in duration, and less intense. About 11 months post-vaccination, milder episodes occurred only 1 to 2 times weekly. These olfactory hallucinations persisted for nearly two years (21 months post-vaccination), occurring randomly throughout the day and unrelated to any other symptoms. When the veteran presented to the clinic, both general and neurological examinations yielded unremarkable results. Brain magnetic resonance imaging (MRI) did reveal chronic sinusitis but showed no other abnormalities. It's importan