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Lacking a sense of smell is called anosmia. A serious head injury can cause anosmia. Most likely this results in damage to the olfactory nerves as they enter the olfactory bulb. The axons enter the brain via holes in the cribiform plateso a sudden blow can sever the axons. Most of what people perceive as taste is actually smell, which is why food tastes bland when you have a head cold.

Anosmia and ageusia (lack of taste) can be due to zinc deficiency. In this case the person may also present with poor wound healing.

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13y ago
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15y ago

Sometimes a virus or someting can destroy your olfactory nerves and you become anosmic. If you can't smell then your sense of taste is effected, too

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12y ago

It is often the beginning of viral infection, such as upper respiratory infection.

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8y ago

Colds, flus and Allergies are known to produce a "stuffy" nose which interacts with the tongue. This will inhibit a person's sense of taste and smell.

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13y ago

smoking.

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Q: Why does a person loose their sense of smell and taste?
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