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Dysgeusia can cause a number of different alterations in taste, including a metallic taste. Some common medical conditions that can cause metallic taste in the mouth include ear or upper respiratory infections such as sinusitis, as well as head injury or conditions that damage the central nervous system (CNS). A history of radiation therapy to the head and neck can also cause a metallic taste in the mouth.
Oily taste in mouth can be due to either eating oily and spicy food, it can be due to gastrointestinal reflux, or improper functioning of the liver. The other causes may include improper oral hygiene, bad dentures, drinking alcohol, smoking tobacco, thick coating on the tongue. Correcting these minor causes can decrease bad taste in the mouth.