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Some people are born with a poor sense of smell or taste. Upper respiratory infections are blamed for some losses, and injury to the head can also cause smell or taste problems. Loss of smell and taste may result from polyps in the nasal or sinus cavities, hormonal disturbances, or dental problems.
The sensations of taste and smell are related, so many disorders of the sense of taste are associated with a decreased sense of smell. These taste disorders can range from obstructions in or damage to the nose to damage to the brain and nervous system in general.The most common pure taste disorder is a phantom taste sensation; this is the perception of a  bad taste in the mouth  that does not go away.he decreased ability to taste certain types of foods is known medically as hypogeusia; the absence of taste entirely is termed ageusia. Dysgeusia refers to the presence of a metallic, rancid, or foul taste in the mouth. Taking certain medications can also interfere with the ability to taste.