Hello, I am a 41 yrs old female.  55 @ 230lbs.  I woke up with a metallic taste in my mouth and the right side of my tongue numb about 7 days ago.  I read on line that it could be gum disease which I know I have but my gums and teeth do not hurt.  Now the right side of my nose & eye runs non stop.  I went to the Dr. and she put me on antibiotics but it hasnt helped... this is day three of being on them.
Thanks for your query, I have gone through your query. The metallic taste could be because of the antibiotics like metronidazole. The other possible causes could be because of the gum infection or pus discharge. Consult an oral physician and get your teeth cleaned. IF you are taking metronidazole then your metallic taste will come down once you stop that medicines. Do saline gargling. I hope my answer will help you, take care.