Every so often, a person notices an odd taste in their mouth that won’t go away, often metallic, sometimes bitter or simply “off,” with no obvious reason for it. It can be unsettling, particularly when it lingers, and it’s natural to wonder what’s behind it and whether it matters.
A strange or metallic taste, known medically as dysgeusia, is a symptom rather than a condition in itself, and it can have a wide range of causes. Many are harmless and temporary, but some are worth paying attention to. Understanding the possible reasons helps make sense of what can be a puzzling experience. Here’s a clear look at what can cause a metallic or strange taste in the mouth, and when it’s worth seeing a professional.
Dental and Oral Causes
Because taste happens in the mouth, some of the most common causes are dental or oral in nature.
Gum disease is a frequent culprit. Inflamed, bleeding gums can produce a metallic or unpleasant taste, particularly if the gums bleed easily, since blood has a distinctly metallic flavour. Poor oral hygiene generally, with a build-up of bacteria, can also cause lingering bad or strange tastes.
Other oral causes include:
- Tooth infections or abscesses, which can produce a foul or metallic taste, often alongside pain or swelling
- Mouth infections, such as oral thrush, which can alter taste
- Dry mouth, which changes how things taste because saliva is essential for normal taste
- Recent dental work, which can sometimes leave a temporary taste
Because dental causes are so common, a strange taste that persists is a good reason to check in on oral health. A practice such as Appin Dental Surgery can check for gum disease, infection or other oral causes behind a persistent taste, and address whatever is found.
Medications and Supplements
One of the most common causes of a metallic taste, and one people often overlook, is medication.
A great many medications list a metallic or altered taste as a side effect. Common examples include certain antibiotics, some blood pressure medications, and various others. Supplements can do it too, particularly those containing iron, zinc or copper, and multivitamins. If a metallic taste started around the time of beginning a new medication or supplement, that’s very often the connection.
This kind of taste change is usually harmless and tends to resolve once the medication is finished or the body adjusts, though it’s worth mentioning to a doctor or pharmacist if it’s bothersome, as sometimes an alternative is available.
Infections and Illness
Being unwell can affect taste, sometimes noticeably.
Colds, sinus infections, and upper respiratory infections commonly alter or dull the sense of taste, partly because taste and smell are closely linked and congestion affects both. A metallic or strange taste often accompanies these illnesses and usually clears up as the illness resolves. This is a very common and entirely temporary cause.
Hormonal Changes
Hormonal shifts can affect taste too, which surprises many people.
Pregnancy in particular is well known for causing taste changes, including a metallic taste, especially in the early stages. This is a common and normal experience during pregnancy and typically settles as the pregnancy progresses. Other hormonal changes can occasionally affect taste as well. For reliable, non-commercial information on oral health and related symptoms, Healthdirect, the Australian Government’s health information service, is a trustworthy reference.
Other Possible Causes
A range of other factors can produce a metallic or strange taste, including:
- Certain medical conditions, which can affect taste as one of their symptoms
- Nutritional deficiencies, such as a lack of certain vitamins or minerals
- Acid reflux, which can bring a sour or unpleasant taste into the mouth
- Smoking, which dulls and alters taste over time
- Exposure to certain substances in particular occupational settings
Because the possible causes are so varied, an occasional or short-lived strange taste is rarely a concern, while a persistent, unexplained one is worth investigating to identify the reason.
When to See a Dentist or Doctor
Most strange tastes are temporary and harmless, but certain situations warrant professional attention.
It’s worth seeing a dentist if the taste is accompanied by signs of a dental problem, such as bleeding gums, tooth pain, swelling, or bad breath, since these point to an oral cause that needs treating. A dentist can identify and address gum disease, infections and other dental sources of a strange taste.
It’s worth seeing a doctor if the taste persists without an obvious dental cause, if it started with a new medication that’s troubling you, or if it’s accompanied by other unexplained symptoms. Because taste changes can occasionally relate to broader health, a persistent, unexplained metallic taste is worth getting checked rather than simply ignoring.
The Bottom Line
A metallic or strange taste in the mouth is a symptom with many possible causes, ranging from the very common and harmless to the occasionally significant. Dental causes such as gum disease, infections and dry mouth are among the most frequent, along with medications and supplements, ordinary illnesses like colds, and hormonal changes such as those in pregnancy.
An occasional or brief strange taste is rarely anything to worry about. But a persistent, unexplained one deserves attention, starting with a dental check if there are any signs of an oral cause, and a medical review if not. Identifying the reason is usually straightforward, and often the cause turns out to be something simple and easily addressed.
Frequently Asked Questions
Why Do I Have a Metallic Taste in My Mouth?
A metallic taste can have many causes. Common ones include gum disease or bleeding gums, dental infections, dry mouth, and poor oral hygiene, along with certain medications and supplements (especially those containing iron or zinc), colds and sinus infections, and hormonal changes such as in pregnancy. An occasional metallic taste is usually harmless, but a persistent one is worth investigating to find the cause.
Can Dental Problems Cause a Strange Taste?
Yes, dental problems are among the most common causes. Gum disease and bleeding gums can produce a metallic taste, since blood tastes metallic, and tooth infections or abscesses can cause a foul or unpleasant taste, often with pain or swelling. Dry mouth and poor oral hygiene can also alter taste. A persistent strange taste is a good reason to have oral health checked by a dentist.
Should I Be Worried About a Metallic Taste?
Usually not. Most metallic or strange tastes are temporary and harmless, caused by things like a cold, a new medication, or minor oral issues. However, a persistent, unexplained metallic taste, or one accompanied by other symptoms such as tooth pain, swelling, bleeding gums or bad breath, is worth having checked by a dentist or doctor to identify and address the underlying cause.
Can Medications Cause a Metallic Taste?
Yes, this is one of the most common causes. Many medications list a metallic or altered taste as a side effect, including certain antibiotics and blood pressure medicines, and supplements containing iron, zinc or copper can do the same. If a metallic taste began around the time of starting a new medication or supplement, that’s often the reason, and it usually resolves. A doctor or pharmacist can advise if it’s bothersome.
