Medications:
(1) oral iron preparations
(2) topical fluorouracil
(3) botulinum toxin A
(4) lidocaine
(5) tetracycline
Toxic exposures:
(1) heavy metal exposure:(metal fume fever, zinc, mercury, zinc, selenium, cadmium, arsenic, tellurium, etc)
(2) toxic mushrooms (Coprine)
(3) ciguerta fish poisoning
Other:
(1) metallic dental restorations
(2) working around a large magnet such as an MRI machine
(3) following therapy for head and neck cancer (with altered taste)
(4) artificial sweeteners
(5) zinc deficiency
(6) oils or food especially after being stored in metal-lined containers
(7) electrical current
(8) oral metal foreign body (sucking on a penny, etc)
