Acid reflux commonly causes unplesant tastes in the mouth. A metalic taste in the mouth is called dysgeusia. Flagyl, tetracycline, penicillamine, Biaxin, ethambutol, biguanides, or allopurinol could cause a metalic taste in the mouth, or several medications that are chewed. Also, several infections of the mouth or teeth could cause the taste. Something else you might look at are the symptoms of Chrohn's disease.
Have you been to the dentist lately? You can get these tastes in the mouth right after getting filling, or if a filling is loose. If the filling is loose and you are eating acidic foods, the interaction with silver will give you a metallic taste.
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