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Causes of Burning Mouth Syndrome: Do Stress and the Autonomic Nervous System Worsen Tongue Pain?
“My tongue feels like it’s been scalded by hot water.”
“My mouth feels dry and has a metallic taste, but the test results say everything is normal.”
“It seems like my tongue hurts more when I don’t get enough sleep or when I’m under a lot of stress.”
If these symptoms recur, you may want to consider the possibility of burning mouth syndrome.
Burning mouth syndrome is a condition in which pain in the tongue and mouth can persist even in the absence of visible sores or inflammation. In particular, it is important to examine how changes in sensory nerves and stress affect the symptoms.
Common symptoms of burning mouth syndrome
A burning sensation in the mouth can manifest in the following ways.
- A burning or stinging sensation on the tip or edge of the tongue
- A dry mouth
- Changes in taste, such as a bitter or metallic taste
- Pain that worsens in the afternoon or evening compared to the morning
- Everything looks normal on the surface, but I keep having discomfort in my mouth
- Pain severe enough to make it difficult to concentrate on eating or conversation
These symptoms may be associated with burning mouth syndrome, but a diagnosis cannot be made based on symptoms alone.
The Relationship Between Oral Burning Sensation and Stress
Stress can affect the nervous system’s ability to perceive and regulate pain.
In particular, when chronic stress and sleep deprivation persist, the body remains in a state of tension, which may increase sensitivity to pain.
A systematic review published in *Biomolecules*in 2021 analyzed 113 studies related to oral burning sensation.
The research team explained that both neuropathic pain and psychological factors may be involved in oral burning sensation, and that the relative importance of these two factors may vary from patient to patient.
Therefore, it is more appropriate to view stress not as the sole cause of burning mouth syndrome, but as a factor that can exacerbate or perpetuate symptoms in some patients.
Why My Tongue Hurts Even Though Test Results Are Normal
Sensations from the tongue are transmitted to the brain via sensory nerve pathways, including the trigeminal nerve.
In cases of burning mouth syndrome, some patients may experience changes in the sensory nerves of the tongue and in pain processing.
A systematic review on small fiber neuropathy published in 2024 analyzed 20 studies and reported that patients with burning mouth syndrome exhibited a decrease in nerve fiber density in the tongue or changes in sensory function.
This indicates that a burning sensation in the mouth may be associated not only with simple mucosal inflammation but also with neuropathic pain.
However, not all patients exhibit the same neurological changes, and the cause of an individual’s pain cannot be determined based solely on these research findings.
What I Learned from Actually Experiencing Tongue Pain
I, too, experienced a tingling sensation on the tip of my tongue, a dry mouth, and a metallic taste during a time in the past when I was under a lot of stress and overworked.
At first, I thought it was a problem with my tongue itself, but as the symptoms kept recurring, I began to examine my sleep, stress, and overall physical tension as well.
This experience served as an opportunity to identify not only the symptoms themselves but also the specific factors that exacerbate them when treating patients with burning mouth syndrome in the future.
While personal experiences cannot account for the treatment outcomes of every patient, they have helped me understand just how much discomfort unobvious oral pain can cause in daily life.
How should we approach the treatment of burning mouth syndrome?
1. Differentiating Between Oral and Systemic Diseases
First, we identify potential causes of oral pain, such as dry mouth, Candida infections, oral mucosal diseases, nutritional deficiencies, medication side effects, and Sjögren’s syndrome.
As needed, we review the results of oral medicine consultations and blood tests, among other things.
2. Evaluation of Sensory Nerves and Pain Patterns
We assess the location and intensity of the pain, how it changes throughout the day, any taste abnormalities, and dry mouth.
We also check to see if the pain fluctuates in response to stress or lack of sleep.
3. Checking the Autonomic Nervous System and Overall Physical Condition
Check to see if these symptoms—such as palpitations, sleep disturbances, indigestion, and excessive anxiety—are present.
While these symptoms can serve as a reference for understanding lifestyle and physical factors that influence pain, a diagnosis of burning mouth syndrome is not based solely on autonomic nervous system imbalance.
4. Individualized Treatment and Lifestyle Management
Depending on the cause, treatment options may include treating oral diseases, managing dry mouth, adjusting medication, and treating neuropathic pain.
In traditional Korean medicine, the appropriateness of herbal medicine or acupuncture treatment is evaluated based on an individual’s symptoms and overall health. However, since the level of evidence and individual responses vary depending on the treatment method for oral burning sensation, careful consideration is necessary.
As part of your daily self-care, it may be helpful to monitor your sleep patterns, reduce your intake of foods or products that irritate your mouth, and keep a record of situations that cause your pain to worsen.
A burning sensation in the mouth: examining just the tongue may not be enough
Even if there are no visible sores on your tongue, the pain may persist.
If you experience recurring burning sensations in your mouth, it is important to first check for oral and systemic diseases, and to also consider sensory nerves, stress, and sleep patterns.
If your symptoms persist, please see a doctor to determine the nature and cause of your current pain.
References
- Neuropathic and Psychogenic Components of Burning Mouth Syndrome: A Systematic Review. Biomolecules, 2021.
- Small Fiber Neuropathy in Burning Mouth Syndrome: A Systematic Review. 2024.
- National Institute of Dental and Craniofacial Research. Burning Mouth Syndrome.
Do you experience recurring symptoms such as a burning sensation on your tongue or a stinging sensation in your mouth?
If you’d like to get a more specific understanding of the discomfort and symptoms you’re currently experiencing, try using the self-checklist for burning mouth syndromebelow. While this self-check cannot replace a diagnosis, it can help you organize your symptoms and consider the appropriate course of treatment.
