Of these, only 18 percent significantly improved their smell function on retesting. We have followed some individuals with this disorder long-term. Some patients will recover function with time. Specifically, treatment with zinc is not recommended because it was not demonstrated to be any more effective than placebo. There is no known effective therapy for taste and/or smell problems due to presumed viral damage. The smell loss is partial rather than total for many, and can be associated with taste loss, parosmias and/or dysgeusias. These patients are typically in the older age groups. Individuals who lose their sense of smell as a result of a respiratory virus generally give us a very clear history of dating their smell loss from a time when they were experiencing cold or flu symptoms. In adults, the two most common causes of smell problems that we see at our Clinic are: (1) Smell loss due to an ongoing process in the nose and/or sinuses such as nasal allergies and (2) smell loss due to injury of the specialized nerve tissue at the top of the nose (or possibly the higher smell pathways in the brain) from a previous viral upper respiratory infection.
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