Which autoimmune diseases can present with a sore throat?

Autoimmune Diseases That Cause Sore Throat

Several autoimmune diseases can present with sore throat, most notably mucous membrane pemphigoid, pemphigus vulgaris, inflammatory bowel disease (particularly Crohn's disease), Hashimoto's thyroiditis, systemic lupus erythematosus, and Still's disease.

Primary Autoimmune Causes

Mucous Membrane Pemphigoid (MMP)

• Laryngeal MMP is rare (1 in 10 million) but can present with persistent sore throat 1
• Characterized by blistering subepithelial lesions causing superficial ulcers on the epiglottis and laryngeal surfaces
• Critical pitfall: Can progress to life-threatening airway stenosis from scarring
• Diagnosis requires direct immunofluorescent staining of biopsy tissue
• Requires multidisciplinary management with dermatology, otolaryngology, and ophthalmology 1

Pemphigus Vulgaris

• Pharyngeal ulcers can be the initial presenting sign 2
• Oral and pharyngeal erosions/ulcers are among the earliest manifestations 3
• Treatment: glucocorticoid therapy as first-line 2

Inflammatory Bowel Disease (IBD)

• Oral Crohn's disease includes deep pharyngeal ulcerations, pseudopolyps, and labial/buccal swelling 4
• Often associated with perineal disease and follows a protracted course
• Metastatic Crohn's involvement can affect nasal mucosa 4
• Treatment targets the underlying IBD with systemic corticosteroids for severe cases; immunomodulators or anti-TNF agents for refractory disease 4

Hashimoto's Thyroiditis

• Throat symptoms occur in significant proportion of patients: abnormal pharyngeal sensation (38%), sore throat (13%), compressive feeling (22%), dry feeling (16%) 5
• Can present with hoarseness in some cases
• Diagnosis: elevated antithyroid antibodies (TMAb positive in 66%, TGAb in 56%), abnormal thyroid uptake on 99mTc scan 5
• Treatment with thyroid replacement (euthyroid/hypothyroid states) or antithyroid drugs (hyperthyroid state) resolves throat symptoms in 84% of patients 5

Secondary Autoimmune Associations

Systemic Lupus Erythematosus (SLE)

• Recurrent mucosal ulcerations are common manifestations 6
• Can affect oral and pharyngeal mucosa
• Hearing disturbances may also occur 6

Still's Disease (Systemic JIA/Adult-Onset Still's Disease)

• Sore throat is a recognized clinical feature 7
• Part of systemic inflammatory presentation with fever, rash, and arthritis
• Diagnosis supported by markedly elevated IL-18 and S100 proteins (calprotectin) 7

Other Autoimmune Conditions

• Wegener's granulomatosis (granulomatosis with polyangiitis): affects nose, sinuses, and can involve pharynx 6
• Sjögren's syndrome: xerostomia and salivary gland involvement, though not typically sore throat 6
• Behçet's disease: recurrent oral and pharyngeal ulcerations 6

Diagnostic Approach

When evaluating persistent sore throat for autoimmune etiology:

1. Exclude infectious causes first - bacterial (Group A strep, gonorrhea) and viral etiologies 8, 9, 10

2. Look for specific clinical patterns:

   • Persistent ulcerations → consider pemphigus, MMP, SLE, Behçet's
   • Throat discomfort with thyroid enlargement → Hashimoto's thyroiditis
   • Deep ulcerations with GI symptoms → Crohn's disease
   • Systemic fever with rash → Still's disease

3. Obtain targeted investigations:

   • Direct immunofluorescence for blistering diseases
   • Antithyroid antibodies (anti-TPO, anti-thyroglobulin) for Hashimoto's 5, 11
   • IL-18 and S100 proteins for Still's disease 7
   • Tissue biopsy when ulcerations present

4. Consider multidisciplinary evaluation with rheumatology, dermatology, and otolaryngology when autoimmune disease suspected 1, 12

Critical Pitfalls to Avoid

• Do not delay biopsy in persistent pharyngeal ulceration - laryngeal MMP can cause airway compromise 1
• Do not start corticosteroids before excluding malignancy or infection - can mask diagnosis or worsen outcomes 7
• Do not overlook thyroid disease in patients with chronic throat discomfort and normal pharyngeal examination 5
• Do not assume viral pharyngitis when symptoms persist beyond 14 days without improvement 8