Metallic taste is a symptom of some food allergies. If you experience distorted taste after eating a certain type of food, such as shellfish or tree nuts, you may have a food allergy. Speak with a doctor if you believe you have an allergy.
What Causes a Metallic Taste in Your Mouth?
If you ingest products containing metal, such as supplements, you may notice a metallic taste in your mouth. This sensation may also be the result of other issues, including allergies and nerve damage.
A metallic taste in your mouth is a type of taste disorder. The medical term for this taste disorder is dysgeusia.
Causes can range from something as harmless as the vitamins you take to serious neurological conditions.
The unpleasant taste can develop suddenly or over longer periods of time.
Poor oral and dental health can contribute to taste dysfunction.
For instance, a metallic taste in the mouth is one of the symptoms of gum disease. Blood in the mouth, such as the kind caused by bleeding gums, can cause a metallic taste.
Dry mouth can also affect your sense of taste.
To keep your mouth and teeth healthy, brush your teeth twice a day and floss at least once a day.
Scheduling regular dental cleanings and getting any cavities filled can help reduce your risk of oral health issues.
Your sense of taste is closely related to your sense of smell. When your sense of smell is distorted, it can have an impact on your sense of taste, too.
Infections that may affect your sense of smell — and may also cause a metallic taste in the mouth — include:
- the common cold
- sinus infections
- other upper respiratory infections
Some pregnant people report a metallic taste, especially early in pregnancy.
The cause is unknown, but some experts believe the metallic taste is caused by the hormonal changes you experience during early pregnancy.
Your central nervous system (CNS) sends messages to the rest of your body, including messages about taste. A CNS disorder or injury can distort these messages, resulting in impaired taste.
Neurological conditions that may cause a metallic taste in the mouth include:
Middle ear and ear tube surgery are often performed due to chronic ear infection.
One 2015 case study followed a man who’d experienced dysgeusia after having middle ear surgery. He saw significant improvement in his symptoms after taking the medication amitriptyline, which is traditionally used to treat depression.
Impaired taste is a common side effect of various medications, including:
- antibiotics, such as clarithromycin and metronidazole (Flagyl)
- blood pressure medications, such as captopril
- metformin (Fortamet, Glumetza), a diabetes medication
- medications for glaucoma, such as methazolamide
- osteoporosis medications
- medications that contain lithium, such as ones used to help treat bipolar disorder
- protease inhibitors, a drug class primarily used to help treat HIV and hepatitis C
The protease inhibitors nirmatrelvir and ritonavir are the primary ingredients in Paxlovid, an antiviral medication that has gained popularity as a COVID-19 treatment. Researchers have identified Paxlovid mouth, or a metallic taste, as a possible side effect. In one clinical trial, 5.6% of people who took nirmatrelvir plus ritonavir reported dysgeusia, compared to 0.3% of people who took a placebo.
Metals are common ingredients in dietary supplements. Taking supplements, especially in high doses, can leave a metallic taste in your mouth, especially if they contain the following:
According to a 2021 literature review, you may also experience a metallic sensation after eating foods that have been fortified with these minerals.
According to the American Cancer Society (ACS) , some forms of chemotherapy can cause a metallic taste in the mouth. This side effect is sometimes called chemo mouth or metal mouth.
Radiation therapy can also cause a metallic taste.
Research suggests that supplements, such as vitamin D and zinc , can help prevent these side effects in people undergoing chemotherapy or radiation therapy. This may indicate that deficiencies in these vitamins and minerals contribute to distorted taste.
Exposure to large amounts of the following toxins or chemicals may cause a metallic taste in the mouth:
- inorganic arsenic, which may be found in products such as pesticides
- lead
- organic mercury
Metallic taste is a symptom of some food allergies. If you experience distorted taste after eating a certain type of food, such as shellfish or tree nuts, you may have a food allergy. Speak with a doctor if you believe you have an allergy.
You may also have a metallic mouth after eating pine nuts. This temporary sensation, which is not an allergic reaction, is sometimes called pine nut syndrome or pine mouth.
Lastly, using certain types of cookware can affect the way your food tastes, leading to a metallic taste. Reactive cookware is composed of metals such as aluminum and cast iron. It’s prized for the way it conducts heat. However, cooking foods in reactive cookware can cause the metals to leach.
If you have gastrointestinal (GI) issues, you may notice a metallic taste in your mouth. GI issues that may cause this sensation include:
- heartburn
- indigestion
- acid reflux
- gastroesophageal reflux disease (GERD)
This sensation may be caused by stomach acid rising to your mouth, or it may be a side effect of the medications you take to treat your GI issues.
A metallic taste in your mouth will often go away once you treat the underlying cause. Contact a doctor if the bad taste persists.
The doctor will often refer you to an otolaryngologist, commonly known as an ear, nose, and throat (ENT) doctor.
An otolaryngologist may order a taste test to help determine the cause and extent of your taste disorder. Taste tests measure a person’s response to different chemicals. The otolaryngologist may also order imaging studies to look at your sinuses. They will likely test your ability to smell, and you may undergo MRI or nasal endoscopy.
Loss of taste can be a serious issue.
Taste is essential to identifying spoiled foods. It also helps you feel satisfied after a meal.
Distorted taste can also affect your appetite or lead to issues such as:
- malnutrition
- unintentional weight loss
- unintentional weight gain
- depression
There’s often little you can do to prevent a metallic taste in your mouth.
If a sinus issue is to blame, the metallic taste should go away once the sinus issue resolves itself. If a medication is causing the metallic taste, ask a doctor about alternatives.
Finding ways to mask the metallic taste may help while you wait for it to go away, especially if it’s caused by pregnancy, chemotherapy, or other long-term conditions or treatments.
Here are some ways you may reduce or temporarily eliminate a metallic taste:
- Chew sugar-free gum or sugar-free mints.
- Brush your teeth after meals.
- Stay hydrated, which helps prevent dry mouth.
- Avoid smoking cigarettes.
- Experiment with different foods, spices, and seasonings.
- Use nonmetallic or nonreactive dishes, utensils, and cookware.
There are also medications that may improve your sense of taste if you’ve developed parosmia, a type of distorted sense of smell. Speak with a doctor to learn more about your options.
Last medically reviewed on November 29, 2022
Metallic Taste in Your Mouth: Common Causes
There are lots of reasons you may have a lingering metallic taste in your mouth, from medication to poor tooth brushing habits. Once you figure out why it’s happening, there are often easy steps you can take to get rid of the problem.
Oral Health
You might need to step up your dental hygiene. Brush and floss regularly to avoid problems with your teeth and gums, like gingivitis, periodontitis, and tooth infections. Those conditions can all put a bad taste in your mouth.
If poor oral health is the cause, you could also have swollen, bright, or dark red gums or gums that bleed easily. You might also have bad breath.
If you have these symptoms, see your dentist for a professional cleaning and ask if you need a prescription to treat any infections.
Colds and Other Infections
Have you been feeling under the weather? Colds, sinus infections, and upper respiratory infections can change the taste in your mouth. If this is the cause, you’ll also have symptoms like a runny or stuffy nose, sore throat, and cough.
Rest, drink plenty of fluids, and take over-the-counter pain relievers if necessary. The metallic taste should go away once you’re better.
Medication
Drugs like antibiotics can give you a metallic taste. Other possible causes in the medicine cabinet include:
- Heart medication
- Medicine for gout
- Antidepressants and lithium (used to treat some mental health conditions)
If the metallic taste bothers you, talk to your doctor, but don’t stop taking your medication without their approval.
Vitamins
Your prenatal vitamins, iron, or calcium supplements could be the cause. Multivitamins with copper, zinc, or chromium can leave a metallic flavor. So can cold lozenges that are made with zinc.
The good news: The metallic taste should go away soon after you take the pills.
Indigestion
Heartburn, acid reflux, and indigestion could be responsible for a metallic taste. Other symptoms you get with these conditions are bloating and a burning feeling in your chest after eating.
To treat the underlying problem, avoid rich foods, eat dinner earlier, and take antacids.
If you keep getting indigestion, have a hard time swallowing, or are in serious pain, see your doctor. The taste in your mouth should go back to normal when your indigestion is under control.
Pregnancy
It’s not a surprise that the taste in your mouth might shift when you’re pregnant.
You could develop a metallic taste at the beginning of your pregnancy. It should be temporary and go away on its own.
Dementia
Things often taste different when you have dementia. The part of the brain that controls taste sometimes stops working well.
Cook with strong or sweet flavors, and try different types of foods and drinks to help increase your appetite.
Cancer Treatment
Bitter or metallic tastes that linger in your mouth are a common side effect of chemotherapy and radiation. It usually goes away when you finish treatment.
In the meantime, switch up your foods to help mask the problem. Add tart ingredients like lemon juice, vinegar, or pickles to your meals. Spices, herbs, and sweeteners bring strong flavor. Try eating more frozen or cold foods. Swap metal utensils for wood or plastic.
Chemical Exposure
Inhaling high levels of mercury or lead can cause a metallic taste in your mouth. It’s important to avoid or lower you and your family’s exposure to these chemicals.
Lead can be harmful to both children and adults. Children can get lead poisoning from lead-based paints or lead-contaminated dust found in older buildings. Air, water, and soil can also get contaminated with lead and be dangerous. Adults who do home renovations and/or work with batteries have a higher risk of lead poisoning.
Mercury can be brought into your home from industrial sites and broken household items, like thermometers. Both long- and short-term exposure to mercury can be harmful to your health.
Removing the source of contamination (like getting rid of the lead-based paint) is the first line of treatment. You may also need medications from doctors.
CNS Disorders
Sometimes a central nervous system (CNS) disorder can cause you to have a taste distortion or make things taste different than usual. These include conditions like Bell’s palsy, multiple sclerosis (MS), and even depression. Talk to your doctor if you have one of these conditions and are noticing a metallic taste.
Metallic Taste in Your Mouth Treatment and Prevention
There’s no one way to treat or prevent a metallic taste in your mouth. Your treatment depends on the cause. In some cases this unpleasant symptom may clear up on its own, for instance if you stop taking the vitamins or remove the source of lead you’ve been exposed to. But other times, you have to try additional methods:
- See your dentist to clear up any infections around your teeth (periodontitis) or gums.
- Brush your teeth and tongue twice per day and floss once per day for good oral hygiene. This can prevent tooth decay and mouth infections.
- Drink water and chew sugar-free gum to keep away oral infections that could cause a metallic taste in the mouth.
- Before meals, rinse your mouth with a combination of a 1/2 teaspoon of salt and 1/2 teaspoon of baking soda in 1 cup of warm water.
- Try using plastic utensils and glass or ceramic cookware rather than metal ones.
- Try marinating meat in sweet fruit juices or sweet wines or cook with lots of herbs and spices.
- Some medications can give you a metallic taste in your mouth. Check with your doctor and let them know that you are experiencing this side effect. Perhaps switching to a different medication may help. Don’t stop taking prescribed medication without first talking to your doctor.
Show Sources
UK National Health Service: “Metallic Taste,” “Indigestion.”
Cleveland Clinic: “8 Possible Causes for That Metallic Taste in Your Mouth.”
Mayo Clinic: “Periodontitis,” “Gingivitis,” “Common Cold,” “Lead Poisoning: Symptoms & Causes,” “When and how often should you brush your teeth?”
Michigan Medicine Rogel Cancer Center: “Food Just Doesn’t Taste the Same.”
Dana-Farber Cancer Institute: “How to Reduce Metallic Tastes During Cancer Treatment.”
Cancer Treatment Reviews: “Metallic Taste in Cancer Patients Treated With Chemotherapy.”
Ohio State University Wexner Medical Center: “What Causes a Bloody or Metallic Taste in Your Mouth During Workouts?”
CDC: “Antibiotic Prescribing and Use in Doctor’s Offices.”
Alzheimer’s Society: “Poor Appetite and Dementia.”
Advances in Oto-Rhino-Laryngology: “Neurological Aspects of Taste Disorders.”
United States Environmental Protection Agency (Agency for Toxic Substances and Disease Registry): “Mercury Quick Facts, Health Effects of Mercury Exposure.”
American Dental Association: “ Xerostomia (Dry Mouth).”
Cancer.Net: “Taste Changes.”
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