Taste - impaired: MedlinePlus Medical Encyclopedia

Just for curiosity...

Taste - impaired: MedlinePlus Medical Encyclopedia

Common causes to impaired or metallic taste in the mouth

• Aging (the number of taste buds decrease with age)
• Bell's palsy
• Common cold
• Flu
• Gingivitis
• Heavy smoking (especially pipe smoking)
• Injury to the mouth, nose, or head
• Mouth dryness
• Nasal infection, nasal polyps, sinusitis
• Pharyngitis
• Salivary gland infections
• Side effects of medicines, including antithyroid drugs, ACEI, griseofulvin, lithium, penicillamine, procarbazine, rifampin, vinblastine, and vincristine (others like metformin and metronidazole are also found to cause metallic taste)
  
• Sjogren syndrome
• Strep throat
• Vitamin B-12 or zinc deficiency

***