What causes a metallic taste in my mouth?

A temporary metallic taste in the mouth is often called dysgeusia. It’s usually not dangerous, but if it keeps happening or doesn’t go away, it’s worth discussing with a healthcare professional because persistent taste changes can sometimes point to an underlying issue.

Common causes

• Dental or gum problems: Gingivitis, periodontitis, or a tooth infection can sometimes cause minor bleeding, which may leave a metallic taste.
• Medications: Some medicines can cause taste changes, including certain antibiotics (such as metronidazole), blood pressure medicines (including some ACE inhibitors), chemotherapy drugs, and some antidepressants.
• Vitamins and supplements: Iron and zinc supplements are common causes of a metallic aftertaste. Other minerals can sometimes contribute as well.
• Colds, sinus problems, and allergies: These can affect smell, which strongly influences taste.
• Pregnancy: Hormonal changes, especially early in pregnancy, can cause temporary taste changes that often improve later in pregnancy.
• Acid reflux (GERD) or indigestion: Reflux can sometimes cause a sour or metallic taste.

When to get checked

See a clinician if the taste change is persistent, keeps coming back, or happens along with other symptoms such as fever, fatigue, trouble swallowing, mouth pain, or unexplained bleeding. Also check with your doctor or pharmacist before stopping any prescription medication.

Caveat: This is general information, not a diagnosis.