Anosmia is defined as the inability to smell all odors. It can be a result of a genetic variation, which can lead to the inability to smell androstenone due to polymorphisms in the OR7D4 gene. 

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Types of olfactory dysfunction 

Boesveldt, S., Postma, E.M., Boak, D., Welge-Luessen, A., Schöpf, V., Mainland, J.D., Ngai, J., & Duffy, V.B. (2017). Anosmia - A Clinical Review. Chemical Senses, 42 (7), 513-523. http://doi.org/10.1093/chemse/bjx025

Anosmia - A Clinical Review

Anosmia (genetic related)

Dysosmia is when olfactory perception is altered but not completely absent. Some symptoms of dysosmia can be when smell is distorted, such as smelling burning paper instead of baby powder. Symptoms could also involve phantom olfaction, or smelling something when there is no olfactory stimulus present. 

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