Why Does My Mouth Feel Bitter and My Tongue Burn? | Incheon Burning Mouth Syndrome

Hello. This is Baekrokdam Korean Medicine Clinic.

1. The Patient's First Words

"Doctor, they said there's nothing wrong at the hospital. But… my tongue keeps burning. And my mouth tastes so bitter."

This is a story we often hear in the clinic.

Tests show no problems, no inflammation, and oral endoscopy is normal, yet patients consistently say, 'my mouth feels hot, bitter, and strange.' Many of these patients are middle-aged women, especially around the perimenopausal period.

So, at first, thinking it might be a 'menopausal symptom,' they visit an OB/GYN, or are referred to neurology or psychiatry. Eventually, after failing to find the cause and trying various medications, many end up visiting a Korean medicine clinic. The name of this condition is Primary Burning Mouth Syndrome, or Primary BMS.

2. What is BMS?

BMS stands for Burning Mouth Syndrome, literally a 'syndrome where the tongue and mouth feel hot/burning.' Typically, a hot and tingling sensation is felt on the front or sides of the tongue, the palate, or the inside of the lips, often accompanied by a bitter taste, dry mouth, and loss of taste (ageusia).

However, the important thing is that there are no visible lesions inside the mouth. There's no swelling, no ulcers, and the white coating on the tongue is normal or almost absent. All tests are normal, so while the symptoms are clear, the diagnosis remains ambiguous. Currently, BMS is classified as a 'type of neuropathic pain.' In other words, it's understood as a state where the pain sensory system of the peripheral or central nervous system has become hypersensitive.

3. What medications are prescribed at hospitals?

Since hospitals view this as neuropathic pain, they typically prescribe anticonvulsants like gabapentin or pregabalin, antidepressants like Cymbalta or amitriptyline, and anxiolytics like clonazepam.

Among these, the most unique is clonazepam sublingual tablets, which are dissolved on the tongue. When placed under the tongue, it absorbs through the oral mucosa, providing a local sedative effect. While some people feel an effect initially, many cannot take it for long due to addiction, lethargy, or a feeling of dependency on the medication.

Ultimately, many visit Korean medicine clinics in a state of 'I've tried this medication and that medication, but nothing works.'

4. But… isn't this Hwabyung?

Honestly, whenever I see such patients, I feel that this cannot be fully explained by the single diagnosis of BMS. This is because patients usually describe it this way:

"My chest feels tight."
"Something keeps welling up within me."
"I'm not angry, but I feel a bubbling sensation inside."
"My mouth is bitter, and it feels like heat is rising only upwards."

This isn't a medical diagnosis like BMS; it's describing the 'progression of the illness.' From a Korean medicine perspective, this progression is a very typical structure of Hwabyung. Specifically, the pathological structure of 'Liver Qi Stagnation (간기울결) → Gallbladder Heat rising upward (담열상역) → bitter mouth (구고), chest tightness (흉민), insomnia (불면)' is often directly observed.

5. BMS and Hwabyung: Different Diagnoses, Overlapping Pathologies

Modern medicine classifies BMS and Hwabyung as entirely different diagnostic systems. BMS is 'neuropathic pain,' while Hwabyung is a 'psychosomatic syndrome due to suppressed emotions.' However, in actual patients, the symptoms overlap so much that they are indistinguishable.

Both involve a burning tongue, bitter taste in the mouth, chest tightness, insomnia, unresolved feelings of injustice, heightened nerves, a foggy head, and a sensation of burning within. At this point, the diagnostic label isn't what's important; rather, it's the underlying pathological progression of the individual that matters.

6. How is it interpreted from a Korean Medicine perspective?

In Korean medicine, this is broadly viewed as four types of pathological patterns:

• Gallbladder Heat Rising Upward Type (담열상역형) → Bitter mouth, flushed face, feeling of much anger/irritability. Gentiana Longdancao Decoction lineage.
• Heart Fire Agitation Type (심화동요형) → Palpitations, insomnia, burning sensation in the mouth. Coptis and Scutellaria Detoxification Decoction lineage.
• Yin Deficiency with Exuberant Fire Type (음허화왕형) → Heat sensation in the afternoon, dry mouth, red and dry tongue. Anemarrhena and Phellodendron Rehmannia Pill lineage.
• Liver Qi Stagnation Type (간기울결형) → Feelings of injustice/resentment, something welling up, frequent sighing. Minor Bupleurum Decoction and Augmented Rambling Powder lineage.

Whether this condition is BMS or Hwabyung, it is crucial to use 'pattern differentiation' to understand 'where these symptoms are originating from.'

7. Unexplained Pain: Now, let's look at the flow/progression

Tests are normal, but the patient is suffering. That is the biggest characteristic of BMS. However, I believe dismissing a patient simply by saying 'it's just hypersensitivity' is an evasion of responsibility in the clinic.

What's needed in such cases is the ability to interpret the 'pathological progression' rather than just the 'diagnosis,' and to understand the 'body's flow' rather than just the 'diagnosis.' I believe this is why Korean medicine can contribute in the area of BMS.

8. Actual Patient Case – Context, not Diagnosis, is Key

A 56-year-old woman had consulted oral medicine, neurology, and psychiatry, stating, "My mouth is very bitter and burns, and I can't sleep well."

She had tried Cymbalta, gabapentin, and clonazepam. The dentist said there were no problems, and psychiatry prescribed antidepressants, but she said, "they make me feel foggy and my mouth gets even drier."

Eventually, she received Korean medicine treatment. From our perspective, she had a simultaneous pattern of Liver Qi Stagnation and Gallbladder Heat Rising Upward. We started treatment based on Minor Bupleurum Decoction, with some modifications from the Gentiana Longdancao Decoction lineage, combined with psychological approaches to encourage emotional expression.

9. Interpretive Power and a Shift in Language

BMS might not be a diagnosis, but rather a label for unexplained suffering. However, Korean medicine looks beyond this label to the body's flow, the direction of emotions, and even the structural balance of the autonomic nervous system.

This difference creates a shift in language and interpretation, from saying 'It's neuropathic pain, take this medicine' to 'Heat from the Liver and Gallbladder is rising upward, making your tongue bitter and hot.' This is what we can do in the clinic, and why Korean medicine can approach unexplained symptoms.