Allergic Rhinitis + Post-Nasal Drip

Pathophysiology & Link Between the Two

• Mucosal inflammation → increased mucus production
• Impaired mucociliary clearance → mucus accumulates and drips posteriorly
• Post-nasal drip (PND) is one of the most common consequences of AR and a leading cause of chronic cough

Classification of Allergic Rhinitis (ARIA Guidelines)

Clinical Presentation

• Nasal congestion, rhinorrhea (clear, watery), sneezing, nasal pruritus
• Itchy/watery eyes (rhinoconjunctivitis)
• "Allergic salute," allergic shiners, Dennie-Morgan lines

• Sensation of mucus dripping down the throat
• Chronic cough (especially nocturnal or positional)
• Throat clearing, hoarseness, sore throat
• Nausea (from swallowed mucus)

Diagnosis

1. History: symptom pattern, triggers, seasonality, family history of atopy
2. Physical exam: pale/boggy nasal mucosa, cobblestoning of posterior pharynx (hallmark of PND)
3. Allergy testing:
   • Skin prick test (SPT) — gold standard for allergen-specific IgE
   • Serum specific IgE (ImmunoCAP/RAST) — alternative when SPT is contraindicated
4. Nasal endoscopy if structural abnormality suspected
5. Rule out differentials for PND: sinusitis, vasomotor rhinitis, GERD, non-allergic rhinitis

Management (Stepwise — Harrison's, p. 9919)

Step 1 — Allergen Avoidance

• HEPA filters, dust-mite-proof covers, pet removal/restriction
• Monitor pollen counts; keep windows closed during high-pollen season

Step 2 — Pharmacotherapy

According to Harrison's (p. 1126), treatment of PND depends on the presumed etiology — allergic PND is treated with antihistamines, decongestants, nasal saline irrigation, and intranasal glucocorticoids/antihistamines/anticholinergics.

Step 3 — Allergen Immunotherapy (AIT)

• Symptoms persist despite maximal pharmacotherapy
• Seasonal or perennial AR with confirmed allergen sensitization
• Concomitant allergic asthma or rhinoconjunctivitis

Special Considerations

When PND Persists Despite AR Treatment

• GERD — LPR can mimic PND; treat with PPI + dietary modification
• Vasomotor (non-allergic) rhinitis — triggered by temperature, humidity, irritants; responds to ipratropium
• Chronic rhinosinusitis — purulent PND, facial pressure, anosmia; requires CT and often ENT referral
• Medication-induced — ACE inhibitors (cough), beta-blockers, NSAIDs

Key Takeaway

Clinical Assessment

Your Symptom Profile at a Glance

Diagnosis: Most Likely a Combination

🔴 Primary: Viral Upper Respiratory Infection (Common Cold) — with recurrence

🟡 Overlapping: Post-Nasal Drip (Upper Airway Cough Syndrome)

🟠 Contributing: Vasomotor / Cold-air-triggered Rhinitis (possibly on a background of subclinical allergic rhinitis)

Why Common Cold Fits Strongly

Why Post-Nasal Drip is a Co-Contributor

• The cough with mucus, salty taste, and hoarseness are hallmark features of Upper Airway Cough Syndrome (UACS), formerly called post-nasal drip syndrome — the leading cause of cough in non-smoking, immunocompetent individuals (Rhinitis guidelines, p. 12)
• Mucus dripping onto the larynx explains the hoarseness and cough
• This is likely a consequence of both the cold and any underlying rhinitis

Why Vasomotor / Cold-Air Rhinitis is a Contributing Factor

• Worsening with fan air is a classic trigger of vasomotor (non-allergic) rhinitis — a hypersensitivity of nasal mucosa to physical stimuli (cold/dry air, temperature change) rather than allergens
• Morning nasal blockage is also a known pattern in vasomotor rhinitis and nasal congestion from recumbent position overnight
• This doesn't mean you have true allergic rhinitis (IgE-mediated), but your nasal mucosa may be reactive to physical/environmental triggers, making you more susceptible during viral infections

Treatment Plan

Immediate (Active Episode)

Antibiotics are NOT indicated. This is almost certainly a viral illness. Antibiotics do not treat colds and risk creating resistance.

Specifically for the Cough with PND

• Nasal saline irrigation + intranasal corticosteroid is the most effective combination for PND-driven cough
• Sleep with your head slightly elevated (extra pillow) to reduce nocturnal postnasal drainage
• Avoid lying flat immediately after eating
• If cough persists beyond 3–4 weeks, consider evaluation for GERD (acid reflux) as a co-trigger

Prevention Strategies

Reduce Cold Recurrence Risk

• Hand hygiene — frequent handwashing with soap; avoid touching face/eyes/nose
• Avoid close contact with symptomatic individuals
• Vitamin C, Zinc — modest evidence for reducing cold duration/severity when taken early
• Adequate sleep and nutrition — immune resilience

Reduce Vasomotor/Environmental Trigger Flares

Long-Term: Rule Out Underlying Allergic Rhinitis

• Since your episodes are recurrent and slow to resolve, it's worth visiting a doctor to check for allergen-specific IgE (skin prick test or blood RAST)
• If allergic rhinitis is confirmed, allergen immunotherapy (SCIT or SLIT) can significantly reduce episode frequency and severity over 3–5 years

When to See a Doctor

• Confirmed fever > 38.5°C persisting beyond 3 days
• Discharge becomes thick, yellow-green, or foul-smelling (suggests bacterial sinusitis)
• Facial pain/pressure over cheeks or forehead (sinusitis)
• Symptoms persist beyond 10–14 days without improvement
• Hoarseness lasting > 2–3 weeks
• Shortness of breath, chest pain, or wheezing (rule out asthma)
• Third recurrence within 2–3 months

Summary

1. Start nasal saline irrigation twice daily
2. Use intranasal fluticasone once daily
3. Take cetirizine once daily
4. Use oxymetazoline for blocked nose — 3–5 days max
5. Rest, warm fluids, paracetamol for systemic symptoms
6. Eliminate fan/cold air exposure directly to your face