A burning sensation in your mouth can come from dozens of different causes, ranging from something as simple as eating spicy food to an underlying nutritional deficiency or nerve problem. If the burning is new and temporary, it’s often tied to something you ate, drank, or put in your mouth. If it keeps coming back or never fully goes away, the cause is more likely medical, and narrowing it down is the first step toward relief.
Common Everyday Causes
The most obvious triggers are foods and drinks that physically irritate mouth tissue. Spicy foods, very hot beverages, acidic fruits like pineapple or citrus, and alcohol can all inflame the delicate lining of your mouth temporarily. This kind of burning resolves on its own within hours or a day at most.
What surprises many people is that their toothpaste can be the culprit. Sodium lauryl sulfate (SLS), a foaming agent found in most commercial toothpastes at concentrations of 0.5 to 2%, can cause the mouth’s inner lining to peel and burn. Some people react to concentrations as low as 0.25%. Alcohol-based mouthwashes can make the irritation worse. Switching to an SLS-free toothpaste and alcohol-free rinse is a simple first test. Cinnamon flavoring and certain dental materials, particularly metals, can also trigger allergic reactions that feel like burning.
Nutritional Deficiencies
Low levels of certain nutrients can quietly produce a chronic burning feeling in your mouth, especially on the tongue. Iron and B12 are the most common offenders. In a study of 399 patients with burning mouth symptoms, roughly 20% were deficient in iron, 22% had low hemoglobin, and about 2.5% were low in B12. All three deficiencies were significantly more common in people with burning mouths compared to healthy controls.
These deficiencies affect your mouth because the tissue lining it turns over rapidly and depends on a steady supply of nutrients to regenerate normally. When iron or B12 runs low, that lining becomes thinner and more vulnerable to irritation. A simple blood test can identify whether a deficiency is behind your symptoms, and supplementation typically resolves the burning within weeks to a couple of months.
Dry Mouth and Medications
Saliva protects your mouth’s lining from friction, bacteria, and acids. When saliva production drops, burning, stinging, and soreness often follow. Dry mouth is one of the most common side effects of prescription medications. Among people taking cardiovascular drugs alone, about 14% develop some form of oral side effect, with dry mouth being the most frequent. Blood pressure medications are particularly well known for this, including ACE inhibitors, diuretics, calcium channel blockers, and beta-blockers.
Antidepressants, antihistamines, and certain pain medications can also dry out your mouth. If the burning started around the same time you began a new medication, that connection is worth raising with your prescriber. Conditions like Sjögren’s syndrome, an autoimmune disorder that attacks moisture-producing glands, can also cause severe dry mouth and chronic oral burning.
Acid Reflux Reaching Your Mouth
Acid reflux doesn’t just cause heartburn. When stomach contents travel high enough, a condition called laryngopharyngeal reflux (LPR) can damage the tissue in your throat and mouth. The key irritant isn’t just acid but a digestive enzyme called pepsin, which can be detected in saliva samples. Pepsin damages cells in the upper digestive tract lining, producing burning, mouth sores, or both.
LPR is easy to miss because many people with it never feel classic heartburn. In a five-year case series, researchers found patients whose only symptom was mouth burning or recurrent mouth sores, with no dental or other medical explanation. Once LPR was identified and treated with anti-reflux therapy and dietary changes, their symptoms improved or resolved entirely within three to six months.
Oral Yeast Infections
Candida, the yeast that causes thrush, naturally lives in your mouth in small amounts. When it overgrows, it can produce burning, soreness, and a cottony feeling, sometimes with visible white patches on the tongue or inner cheeks. Thrush is more likely if you use inhaled steroids for asthma, take antibiotics frequently, have diabetes, or have a weakened immune system. Because it’s a treatable infection, it’s one of the conditions doctors rule out before diagnosing a chronic nerve-related burning problem. The presence of visible changes to the mouth tissue, such as white or red patches, is a key distinguishing feature.
Hormonal Changes and Menopause
Women going through perimenopause or postmenopause are disproportionately affected by chronic mouth burning. The highest-risk group is women over 50. In population studies, women account for about 60% of burning mouth cases, and the condition peaks between ages 60 and 69, when 44% of cases occur. Estrogen plays a role in maintaining the health of mucous membranes throughout the body, including the mouth, and its decline during menopause appears to leave oral tissue more vulnerable. In some cases, hormone replacement therapy helps relieve the burning.
Burning Mouth Syndrome
When doctors can’t find an underlying cause like a deficiency, infection, reflux, or medication side effect, the diagnosis is burning mouth syndrome (BMS). This is classified as a nerve-related (neuropathic) condition. The International Headache Society defines it as oral pain with a burning quality, felt on the surface of the mouth lining, recurring for more than two hours per day for at least three months, with a completely normal-looking mouth on examination.
Primary BMS is believed to result from damage to the nerves that control pain and taste. People with it often notice that the burning is mild in the morning and worsens throughout the day, or that it disappears while eating but returns afterward. The tongue, especially the tip and sides, is the most common site.
Treatment focuses on calming overactive pain nerves. Low doses of certain anti-seizure and anti-anxiety medications, as well as older-generation antidepressants used at pain-relieving doses, have shown benefit in studies. Newer antidepressants that target serotonin alone have not proven effective for this condition. Some people also find relief from topical treatments applied directly to the mouth. The response to treatment varies, and it can take trial and adjustment to find what works.
Habits That Make It Worse
Grinding or clenching your teeth, especially at night, irritates mouth tissue and can contribute to burning. Smoking is another significant risk factor. Stress, anxiety, and depression are closely linked with burning mouth symptoms, both as contributing causes and as consequences of living with chronic oral pain. Addressing these factors, whether through a night guard, stress management, or mental health support, can meaningfully reduce symptoms even when they aren’t the primary cause.
Getting to the Right Diagnosis
Because so many conditions can cause a burning mouth, finding the right answer usually involves a process of elimination. Blood work can check for iron, B12, folate, and blood sugar abnormalities. A visual exam can rule out thrush or other infections. A medication review can identify drug-related dry mouth. If reflux is suspected, saliva testing for pepsin or pH monitoring can confirm it.
The practical takeaway: a mouth that burns for a few hours after a spicy meal is normal. A mouth that burns repeatedly over days or weeks, with no obvious dietary trigger, is your body signaling that something else is going on. Many of the secondary causes are straightforward to treat once identified.