A condition in which a person tends to lose his/her sense of smell partially or completely can be termed as anosmia. Though usually it is a temporary occurrence owing to the nasal congestion along with a cold or flu. However due to varying health complications that surface with advancing age older adults are at risk of losing their sense of smell permanently. You may also suffer from permanent loss of smell due to other health ailments that affect your brain or nerves like tumours or trauma to your head. Sinusitis cold smoking influenza flu and so on can trigger anosmia.