Sjogren's Syndrome Is Still A Rare Diagnosis For Dry Or Burning Mouth

Medication-induced xerostomia is especially underrecognized. Antidepressants, antihypertensives, antihistamines, anticholinergics, anxiolytics, muscle relaxants, pain medications, bladder medications, and many other common drugs can reduce salivary flow or worsen the subjective sensation of dryness and oral burning.

When patients complain of dry mouth, oral burning, altered taste, recurrent cavities, or oral thrush, both patients and clinicians often jump immediately to Sjögren’s syndrome. Sjögren’s is an important autoimmune cause of salivary gland dysfunction related to Lupus and Rheumatoid Arthritis often occurring in familial clusters. But in everyday clinical practice, dry mouth is far more often driven by medication effects, polypharmacy, inadequate hydration, mouth breathing, systemic disease, aging-related salivary hypofunction, or some combination of these very ordinary culprits. It is easy to look for "zebra" diagnoses as a clinician and to attribute dry mouth to autoimmune disease, but the "horse" is usually your medication list.¹ ²

Medication-induced dry remains particularly underrecognized. Antidepressants, antihypertensives, antihistamines, anticholinergics, anxiolytics, muscle relaxants, pain medications, bladder medications, and many other common drugs can reduce salivary flow or worsen the subjective sensation of dryness. "Polypharmacy" which means being on multiple medications, compounds the problem, particularly in older adults. A dry mouth complaint should trigger a careful medication review and hydration habits along with caffeine and alcohol intake, before reflexively launching an autoimmune workup.¹ ³

Xerostomia is also a well-recognized complication after head and neck radiation and other cancer therapies, and may also be seen after hematopoietic stem cell transplantation, particularly in patients with chronic oral graft-versus-host disease. These causes are important to recognize, but in routine dental dry-mouth evaluations they are far less common than medication-related and underhydration-related xerostomia.⁴ ⁵

Dry mouth is more than an annoyance. Saliva lubricates oral tissues, buffers acids, helps clear sugars, supports swallowing and speech, and contributes to antimicrobial defense. When salivary function is reduced, patients are at increased risk for cervical/root caries, dysgeusia, mucosal soreness, denture intolerance, dysphagia, oral burning, and oral candidiasis. A 2022 systematic review and meta-analysis found that xerostomic patients had higher odds of oral candida (fungal) growth compared with controls.⁶ ⁷

In dental and medical offices, Sjögren’s syndrome should remain on the differential for dry mouth, especially when accompanied by dry eyes, gland swelling, systemic symptoms, positive autoimmune markers, or objective hyposalivation. But the first-pass workup should be the following algorithm: medication list, hydration habits, caffeine/alcohol use, mouth breathing, diabetes control, mucosal findings, caries pattern, and oral candidiasis assessment. Most dry mouth is common, cumulative, and hides in plain sight.⁸

References

1. Robinson-Barella A, et al. From Drugs to Dry Mouth: A Systematic Review Exploring Oral Health Impacts of Polypharmacy in Older Adults. 2023.

2. Hayslett RL, et al. Management of Dry Mouth. 2025.

3. Kohli D, Madhu M, Korczeniewska OA, Eliav T, Arany S. Association between medication-induced xerostomia and orofacial pain: a systematic review. Quintessence International. 2023;54:658-670.

4. Hosseini MS, Sanaie S, Mahmoodpoor A, et al. Cancer treatment-related xerostomia: basics, therapeutics, and future perspectives. European Journal of Medical Research. 2024;29(1):571.

5. Johnson LB, et al. A review of oral chronic graft-versus-host disease. 2022.

6. Molek M, Florenly F, Lister INE, Wahab TA, Lister C, Fioni F. Xerostomia and hyposalivation in association with oral candidiasis: a systematic review and meta-analysis. Evidence-Based Dentistry. 2022. doi:10.1038/s41432-021-0210-2.

7. Kapourani A, et al. A Review on Xerostomia and Its Various Management Strategies. Polymers. 2022;14(5):850.

8. Khavandgar Z, et al. Evaluation and management of dry mouth and its complications. 2024.