A burning sensation in your mouth can come from something as simple as a spicy meal or a new toothpaste, or it can signal a nutritional deficiency, a hormonal shift, or a chronic pain condition called burning mouth syndrome. About 1.7% of the general population experiences persistent oral burning, and the cause isn’t always obvious. Understanding the most common reasons can help you figure out what’s going on and what to do next.
Burning Mouth Syndrome
If the burning has lasted weeks or months with no visible sores, redness, or other changes inside your mouth, you may have burning mouth syndrome (BMS). This is a chronic pain condition where the nerves in your mouth send pain signals without any identifiable injury or infection. The burning typically affects the tongue, roof of the mouth, lips, or gums, and it can feel like you’ve scalded your mouth on hot coffee.
One of the hallmark features of BMS is that the pain often improves while you’re eating or drinking, then returns afterward. This is the opposite of what happens with infections or sores, where eating tends to make things worse. The burning usually starts mild in the morning, builds throughout the day, and peaks by evening.
Women are about three times more likely to develop BMS than men, with a prevalence of 1.15% in women compared to 0.38% in men. People over 50 are the most commonly affected group, with prevalence rising to 3.31% in that age range. The condition is considered “primary” when no underlying medical cause can be found, meaning the problem lies in the pain-signaling nerves themselves.
Nutritional Deficiencies
Low levels of certain vitamins and minerals are strongly linked to oral burning. In a study of 399 patients with burning mouth symptoms, roughly 22% had low hemoglobin, 20% had low iron, and about 2.5% were deficient in vitamin B12. All three deficiencies were significantly more common in people with burning mouths than in healthy controls.
Iron and B12 are essential for maintaining healthy oral tissues. When your body doesn’t have enough of either, the lining of your mouth can thin and become more sensitive, creating that raw, burning feeling. The same study found that patients with burning mouth symptoms also had abnormally high levels of homocysteine, an amino acid that rises when B12 and folate are insufficient. A simple blood test can check for these deficiencies, and in many cases, correcting them with supplements resolves the burning.
Hormonal Changes and Menopause
The fact that BMS overwhelmingly affects women in their 50s and older points strongly to a hormonal connection. The estrogen fluctuations that occur during perimenopause and menopause are suspected of making pain receptors in the mouth hypersensitive. The exact mechanism isn’t fully understood, but one leading theory is that dropping estrogen levels alter how the nerve endings in your oral mucosa process sensation, turning normal stimuli into pain signals.
If you’re in perimenopause or postmenopause and your mouth has started burning without any visible cause, this hormonal shift is a likely contributor. Some women notice the burning starts around the same time as other menopausal symptoms like hot flashes or dry mouth.
Your Toothpaste or Mouthwash
Sometimes the culprit is sitting on your bathroom counter. Sodium lauryl sulfate (SLS), the ingredient that makes toothpaste foam, is a known irritant with allergenic potential. Case reports have documented patients developing painful inflammation on the front of the tongue from SLS-containing toothpastes. In each case, the pain resolved after switching to an SLS-free product.
Alcohol-based mouthwashes can cause similar irritation, especially if you use them frequently or already have dry mouth. Cinnamon flavoring (cinnamates) in toothpaste, gum, or candy is another common trigger for contact reactions inside the mouth. If the burning started around the time you switched oral care products, try eliminating them one at a time to see if things improve.
Oral Thrush and Fungal Infections
A yeast infection in the mouth, called oral candidiasis or thrush, can produce burning that’s easy to confuse with BMS. The key difference is when the pain happens. With thrush, the burning gets worse while you eat. With BMS, eating actually provides temporary relief. This distinction between “functional pain” (pain during use) and “nonfunctional pain” (pain at rest) is one of the most reliable ways to tell the two apart.
Thrush doesn’t always look the way you’d expect. While classic thrush produces white patches, some forms cause only subtle thinning or redness on the tongue that’s easy to miss. Even when the tongue looks almost normal, a mild yeast overgrowth can still cause burning. This is one reason the condition gets misdiagnosed. If antifungal treatment clears the burning, the yeast was likely the cause.
Silent Reflux
Acid reflux doesn’t always announce itself with heartburn. In a form called laryngopharyngeal reflux (LPR), stomach acid travels past the esophagus and up into the throat, and sometimes all the way to the mouth. This happens when both the lower and upper muscular valves that seal off the esophagus relax inappropriately, allowing acid to creep higher than it normally would.
LPR is sometimes called “silent reflux” because you may not feel the classic chest burning at all. Instead, you might notice a sour or bitter taste, a burning sensation on your tongue or palate, chronic throat clearing, or a hoarse voice. If your mouth burning tends to be worse after meals, when lying down, or first thing in the morning, reflux is worth investigating.
Medications That Cause Oral Burning
Several common medications can trigger a burning or scalded sensation in the mouth as a side effect. ACE inhibitors, a widely prescribed class of blood pressure drugs, are among the most documented offenders. Case reports have linked captopril, enalapril, and lisinopril to a burning sensation in the oral tissues. Other cardiovascular drugs associated with oral side effects include angiotensin receptor blockers (ARBs), diuretics, calcium channel blockers, and beta-blockers.
If your mouth started burning after beginning a new medication or changing a dose, that timing is worth mentioning to your prescriber. In some cases, switching to a different drug in the same class eliminates the problem.
Dry Mouth
Saliva protects and lubricates the tissues inside your mouth. When saliva production drops, whether from medications (antihistamines, antidepressants, and diuretics are common causes), dehydration, or conditions like Sjögren’s syndrome, the unprotected tissues become vulnerable to irritation. The result often feels like burning or stinging, especially on the tongue.
Dry mouth also makes you more susceptible to yeast overgrowth and tissue damage from acidic or spicy foods, which can compound the burning. Staying well hydrated, using saliva replacement products, and avoiding alcohol-based mouthwashes can all help.
What Relief Looks Like
Treatment depends entirely on the cause. If a blood test reveals iron or B12 deficiency, supplementation can resolve the burning within weeks. If thrush is identified, antifungal treatment targets it directly. If a medication is the trigger, switching drugs may be all it takes.
For primary burning mouth syndrome, where no underlying cause is found, management focuses on reducing nerve pain. Options include topical numbing agents like lidocaine rinses, alpha-lipoic acid (an antioxidant that may calm nerve pain), low-dose clonazepam, certain antidepressants that modulate pain signaling, and, somewhat counterintuitively, capsaicin, the compound in chili peppers that can desensitize overactive pain receptors over time.
Practical steps that help across most causes include avoiding acidic foods and drinks like citrus, tomatoes, and carbonated beverages during flare-ups, switching to SLS-free toothpaste, sipping water throughout the day, and cutting back on alcohol and tobacco. Many people find that chewing sugar-free gum stimulates enough saliva to provide temporary relief.