Burning Mouth Syndrome (BMS): Symptoms, Causes, Diagnosis, and Treatment

Burning Mouth Syndrome (BMS) is a condition that causes a persistent burning or scalding sensation in the mouth—often on the tongue, lips, gums, palate, or the whole mouth—without an obvious visible cause. For some people it’s mild and intermittent; for others it can be intense and affect sleep, eating, and quality of life.

What does Burning Mouth Syndrome feel like?

People describe BMS in different ways, but common symptoms include:

• Burning, tingling, or hot sensation (often worse later in the day)

• Dry mouth feeling, even if saliva looks normal

• Altered taste (bitter/metallic) or reduced taste

• Increased sensitivity to spicy, acidic, or hot foods

Symptoms can come and go, or be present daily for months. Importantly, the mouth often looks normal on exam, which can be frustrating for patients.

Why does BMS happen? (Primary vs. secondary BMS)

BMS is usually grouped into two categories:

1. Secondary BMS: the burning is caused by another condition that can be identified and treated.

2. Primary (idiopathic) BMS: no clear cause is found after a thorough evaluation. Research suggests it may involve changes in how oral nerves process pain.

Common treatable causes of secondary BMS include:

• Dry mouth (from medications, dehydration, Sjögren’s syndrome, etc.)

• Oral infections (such as yeast/candida)

• Nutritional deficiencies (iron, vitamin B12, folate, zinc)

• Diabetes or thyroid disorders

• Reflux (acid reaching the throat/mouth)

• Allergies or irritation (dental materials, mouthwashes, toothpaste ingredients)

• Hormonal changes (often around menopause)

How is BMS diagnosed?

There isn’t one single test for Burning Mouth Syndrome. Diagnosis is based on your symptoms, an oral exam, and tests to rule out treatable causes. A focused evaluation may include:

• Review of medications and medical history

• Blood tests (iron, B12, folate, glucose/HbA1c, thyroid function, and others as needed)

• Tests for dry mouth and salivary gland function when relevant

• Swab/culture if yeast infection is suspected

• Assessment for reflux, oral habits (tongue thrusting, clenching), and irritants

If a specific cause is found and treated, symptoms may improve significantly.

Treatment options and self-care

Treatment depends on whether BMS is secondary or primary. Options may include:

• Treating underlying causes (correcting deficiencies, managing diabetes/thyroid issues, treating yeast infection, addressing reflux, adjusting irritating products)

• Dry mouth strategies (frequent sips of water, sugar-free gum/lozenges, saliva substitutes)

• Avoiding triggers (spicy foods, acidic drinks, alcohol, tobacco, strong mouthwashes)

• Pain-modulating treatments for primary BMS (your clinician may discuss topical or systemic options based on your situation)

• Stress and sleep support (because symptoms often worsen with stress and fatigue)

Because BMS can have multiple contributing factors, a step-by-step plan and follow-up are often the most effective approach.

When should you seek help?

If you’ve had burning mouth symptoms for more than 2 weeks, or if the discomfort is affecting eating, sleep, or daily life, it’s worth getting evaluated. A specialist assessment can help rule out treatable causes and build a targeted plan.

If you’d like, you can contact our clinic to schedule an evaluation.