Sinus Infection (Sinusitis): What It Is, Common Symptoms and Early Signs

11. Hyposmia or anosmia

Nasal infections can also change the way we perceive odors, which is known as hyposmia or anosmia. Hyposmia refers to a decreased sensation of smell. Anosmia is a complete absence of this sensation. Hyposmia is more common, but sometimes, more severe infection and some infectious agents affect the olfactory bulb or cause a severe blockage that leads to anosmia.