It is natural to assume internal bleeding is the cause of a metallic taste in your mouth since you might associate it with iron, which is one of the blood components.

In reality, numerous factors are responsible for "metal mouth". While it can be a harmless side-effect of particular medical treatments, it can also be a symptom of more severe conditions.


A metallic taste is one of typical harmless side effects of popular medications.

Some antibiotics, antidepressants, lithium-based substances, gout medications, and medicines for high blood pressure, cardiac issues and diabetes can cause distortion in taste. Other examples are iron, calcium, zinc, chromium or prenatal vitamin supplements.

If the taste bothers you too much and you cannot enjoy your favorite food, consult your doctor to get another treatment if possible.

Deficiency of Vitamin B-12

Vitamin B-12 deficiency can be a source of a metal mouth in your mouth too. In this case, you might also experience fatigue, headaches and loss of appetite.

Insufficient consumption of vitamin B-12 blocks adequate production of red blood cells and prevents your organs from getting enough oxygen.

Usually, vitamin supplements help to address the issue.

Chemotherapy and radiation

Radiation cancer treatment and chemotherapy can affect your sense of taste making it unnaturally bitter or adding a metallic flavor.

This effect will accompany you during the entire treatment, however, you will experience improvement in taste when you finish your therapy.


Untypical senses of smell and taste are common complaints of pregnant women. These are natural results of complex body changes.

Intensified changes in taste perception can lead to morning sickness and have a radical impact on nutritional preferences. Inform your doctor of severe disturbances in taste if they prevent you from having a balanced diet.

Your prenatal vitamins, especially products containing calcium and iron, can be the culprit too.

Liver or kidney failure

Acute liver and kidney diseases spread wastes around your body changing your taste perception.

Fatigue, nausea, weakness, and confusion are typical for both liver and kidney diseases. Kidney failure also features fluid retention. Pain in the upper right part of the abdomen and yellowish skin and eyeballs are also typical for liver failure.

Any of these symptoms require urgent hospitalization.

Sinus infection or an upper respiratory infection

Taste abnormalities are common companions of upper respiratory and sinus infections. In such a case, you will soon regain your normal test sensation once you recover.

Note that a constant metallic taste can indicate a chronic condition that requires diagnosis and effective treatment.

Neurological diseases

It is typical for many neurological diseases to cause a metallic taste. Some of them are dementia, multiple sclerosis and Bells' palsy.

If you are also suffering from sudden and persistent headaches, numbness, memory loss, vision impairments or muscle weakness, consult your doctor for a proper diagnosis.

Gum disease

A metallic taste is one of the common symptoms of periodontitis or gum disease resulting from chronic infections in gum tissues.

When periodontitis affects your oral health, you feel a metallic taste because of frequent or constant gum bleeding. It requires urgent medical attention as gum infections can eventually destroy the jaw bone surrounding your teeth. Without this support, your teeth will become loose.

Poor oral hygiene

Insufficient oral hygiene causes gingivitis. This condition leads to gum inflammation resulting in a strange taste of metal.

If you experience pain, swelling or bleeding in your gums, visit your dentist to address the problem as soon as possible before it severely affects your dental health.

Food allergies

Allergies to some products, especially pine nuts and shellfish can give you a sensation of a metallic taste, which can last even up to three days after consumption of an allergen. It is a sign of a severe allergy or anaphylaxis.

Discuss this experience with your doctor to prevent potentially lethal anaphylactic shock.

Exposure to mercury or lead

Mercury and lead are widespread heavy metals that can intoxicate the human body and cause a metallic taste.

Industrial sites and landfills are common culprits for heavy metal pollution. Additionally, some household items also contain these dangerous substances. For instance, lead is present in batteries. You can find mercury in older versions of thermometers.

If you have developed symptoms of poisoning, immediately contact your doctor.

COVID vaccine side effect

If you have recently undergone COVID-19 vaccination, you might experience a metallic taste in your mouth. Although this is not a widespread side effect of the procedure, the vaccine is also one of the culprits for a change of taste.

How to get rid of the metallic taste in the mouth?

You can partially mask a metallic taste with products featuring strong tart, spicy or sweet flavors. Refrain from using metal utensils while having your food.

Take care of your oral hygiene and health. Ask your doctor for alternative medications without a side effect of a metal taste.

Consider quitting smoking, which intensifies the taste of metal.