Sore Throat That Won't Go Away for Weeks: Causes

How long is a sore throat expected to last?

Most throat infections from a virus (the most common cause of sore throat by far) resolve within 7–10 days. Strep throat, treated with antibiotics, typically improves within 3–5 days. Mononucleosis, caused by the Epstein-Barr virus, can cause a sore throat that lingers 2–4 weeks.

If throat discomfort persists beyond 3 weeks — particularly if there was no clear initial infection or the symptoms have not followed the expected improvement curve — something other than a resolving infection is likely driving the symptoms.

What are the most common causes of a chronic sore throat?

Laryngopharyngeal reflux (LPR) — acid reflux affecting the throat: This is one of the most frequently underdiagnosed causes of persistent throat discomfort. Stomach acid that reaches the throat and larynx causes a chronic burning, raw, or scratchy sensation — often worse in the morning or after eating. Unlike typical heartburn, people with LPR may have no chest burning at all, making the throat the primary symptom. Other signs include a sensation of something stuck in the throat (globus), frequent throat clearing, hoarseness, and chronic cough 1Ref 1Irwin RS, French CL, Chang AB, Altman KW; CHEST Expert Cough Panel (2018).Classification of Cough as a Symptom in Adults and Management Algorithms: CHEST Guideline and Expert Panel Report.Laryngopharyngeal reflux and upper airway cough syndrome (postnasal drip) as recognized causes of chronic throat symptoms and cough; behavioral management of LPR.

Postnasal drip from allergies or sinusitis: Mucus dripping down the back of the throat causes irritation and a constant need to clear the throat. It is often worse at night and upon waking. The throat feels raw rather than infected. Treating the underlying allergy or sinus inflammation typically resolves this 2Ref 2Seidman MD, Gurgel RK, Lin SY, Schwartz SR, Baroody FM, Bonner JR, et al. (2015).Clinical Practice Guideline: Allergic Rhinitis.Postnasal drip from allergic rhinitis as a cause of chronic throat irritation and the role of treating underlying allergy including nasal corticosteroids.

Dry air, mouth breathing, or environmental irritants: Heated indoor air in winter, breathing through the mouth (often due to nasal congestion), cigarette smoke — including secondhand smoke — and occupational chemical exposure all cause a chronic raw or scratchy throat without any infectious cause.

Voice overuse or vocal strain: Teachers, singers, call-center workers, and others who use their voice extensively can develop chronic throat discomfort and hoarseness from vocal fold fatigue or nodules. The throat feels irritated after extended speaking, and the voice may be rough in the mornings.

Chronic tonsillitis or tonsillar crypts with debris: Recurring tonsil infections that never fully resolve, or tonsil stones (calcified debris in tonsil pockets), can cause persistent throat discomfort, a sensation of something stuck, and sometimes bad breath.

Medication side effects: ACE inhibitors (a class of blood pressure medications) cause a dry, persistent cough and throat irritation in a notable proportion of people who take them. If you started a new medication around the time your throat symptoms began, discuss this with your prescribing clinician.

What causes that need specialist evaluation?

While the causes above account for most persistent sore throats, several presentations should prompt evaluation by an ENT (otolaryngologist) rather than watchful waiting:

• Persistent hoarseness lasting more than 2 weeks — especially with no obvious cause — warrants laryngoscopy to visualize the vocal cords 3Ref 3Stachler RJ, Francis DO, Schwartz SR, et al. (2018).Clinical Practice Guideline: Hoarseness (Dysphonia) (Update).Recommendation for laryngoscopy when hoarseness fails to resolve within 4 weeks; importance of direct laryngeal visualization for persistent hoarseness to rule out structural or malignant causes
• Throat pain that is clearly one-sided and not improving
• A neck mass or lump appearing alongside throat symptoms
• Difficulty swallowing (dysphagia) or a sensation that food is sticking
• Unexplained weight loss alongside throat symptoms
• History of significant tobacco or alcohol use — these are the two strongest risk factors for oropharyngeal and laryngeal cancers, which can present with persistent throat discomfort, hoarseness, or a neck mass

Oropharyngeal cancers can also be associated with human papillomavirus (HPV) infection, even in people who have not smoked. A persistent throat symptom without explanation in someone with these risk factors should not be observed for months — an ENT evaluation with direct laryngoscopy is appropriate 3Ref 3Stachler RJ, Francis DO, Schwartz SR, et al. (2018).Clinical Practice Guideline: Hoarseness (Dysphonia) (Update).Recommendation for laryngoscopy when hoarseness fails to resolve within 4 weeks; importance of direct laryngeal visualization for persistent hoarseness to rule out structural or malignant causes.

What will an ENT evaluation involve?

An ENT can perform a thorough examination of the throat, larynx, and vocal cords using flexible laryngoscopy — a thin, flexible camera passed through the nose to view the structures that cannot be seen with a standard tongue depressor and light. This examination takes just a few minutes and is well tolerated by most people.

Depending on findings, the ENT may: - Confirm a diagnosis of LPR and begin empiric treatment - Identify vocal fold changes suggesting nodules, polyps, or concerning lesions - Order imaging (CT or MRI of the neck) if a mass or deep tissue abnormality is suspected - Recommend a trial of anti-reflux treatment or allergy management 2Ref 2Seidman MD, Gurgel RK, Lin SY, Schwartz SR, Baroody FM, Bonner JR, et al. (2015).Clinical Practice Guideline: Allergic Rhinitis.Postnasal drip from allergic rhinitis as a cause of chronic throat irritation and the role of treating underlying allergy including nasal corticosteroids

A primary care clinician can initiate evaluation and start treatment for the most common causes (reflux, allergic rhinitis) before or in parallel with an ENT referral.

What self-care measures can help while waiting to be seen?

Depending on the suspected cause, several measures may reduce throat discomfort:

• For reflux-related throat irritation: elevate the head of your bed, avoid large meals close to bedtime, reduce alcohol and caffeine, avoid eating within 3 hours of lying down 1Ref 1Irwin RS, French CL, Chang AB, Altman KW; CHEST Expert Cough Panel (2018).Classification of Cough as a Symptom in Adults and Management Algorithms: CHEST Guideline and Expert Panel Report.Laryngopharyngeal reflux and upper airway cough syndrome (postnasal drip) as recognized causes of chronic throat symptoms and cough; behavioral management of LPR
• For postnasal drip: treat the underlying allergy or congestion with saline rinses and nasal corticosteroid spray; a warm steam inhalation can soothe the throat 2Ref 2Seidman MD, Gurgel RK, Lin SY, Schwartz SR, Baroody FM, Bonner JR, et al. (2015).Clinical Practice Guideline: Allergic Rhinitis.Postnasal drip from allergic rhinitis as a cause of chronic throat irritation and the role of treating underlying allergy including nasal corticosteroids
• For dry air: a bedroom humidifier maintains mucosal moisture, particularly during winter heating months
• For voice strain: voice rest (not whispering — whispering actually strains the cords more), adequate hydration, and reducing unnecessary throat clearing
• For all types: staying well hydrated and avoiding tobacco smoke

Warm liquids (herbal tea, warm water with honey), throat lozenges, and occasional OTC pain relievers can ease discomfort. These are symptomatic measures — they address comfort while you get to the root cause.