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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.
All the above medications have side effects that include producing metallic taste in mouth. Oral problems like periodontitis and gingivitis can also cause this taste. It can be the symptom or warning sign for underlying disease like cancer, ulcer, food allergy and lichen planus. Many kinds of poisoning like lead poison, mercury poison, iodine poison, cadmium poison, selenium toxicity, increased copper level can produce metallic taste in your mouth.