Chronic Sore Throat: Diagnostic Approach and Common Causes

Primary Etiologies

Gastroesophageal reflux disease (GERD) is the second most common cause of chronic sore throat, and can present as "silent GERD" without typical heartburn or regurgitation symptoms in up to 75% of cases, according to the American Thoracic Society 1
Laryngopharyngeal reflux disease represents a distinct entity where refluxate irritates the upper respiratory tract, particularly the larynx, without aspiration, as noted by the American Thoracic Society 1

Viral pharyngitis accounts for 65-85% of acute sore throat cases, with common pathogens including rhinovirus, coronavirus, adenovirus, influenza, parainfluenza, and Epstein-Barr virus, as reported by the American Academy of Family Physicians 2
Group A β-hemolytic streptococcus (Streptococcus pyogenes) is the primary bacterial cause, accounting for 15-30% in children and 5-15% in adults, according to the American Academy of Pediatrics and the Infectious Diseases Society of America 3

Associated symptoms help narrow the differential: conjunctivitis, cough, hoarseness, coryza, or diarrhea suggest viral etiology, as noted by the American Academy of Family Physicians 2
Tonsillar exudates, fever, tender anterior cervical adenopathy, and absence of cough suggest bacterial pharyngitis, according to the American Academy of Family Physicians and the Infectious Diseases Society of America 3
Laryngoscopy may reveal signs of reflux laryngitis including posterior laryngitis with red arytenoids and piled-up interarytenoid mucosa, as reported by the American Thoracic Society 1

Thyroid disease, particularly thyroiditis, can cause chronic sore throat through local irritative effects of the inflamed thyroid, as noted by the American Thoracic Society 4 and 5

Do not assume typical GI symptoms are required for GERD-related chronic sore throat—up to 75% of cases present without heartburn or regurgitation, according to the American Thoracic Society 1
Do not rely on cough character or timing to distinguish between etiologies, as these features are not diagnostically useful, as reported by the American Thoracic Society 6 and 1
Do not overlook systemic diseases such as thyroid disorders, diabetes, or autoimmune conditions that can manifest primarily as chronic sore throat, as noted by the American Thoracic Society 4 and 5