Dry Cough + Sore Throat: Causes, Diagnosis & Management

Common Causes

• Common cold (rhinovirus, coronavirus, parainfluenza): the leading cause. Sore throat is usually mild, with rhinorrhea and nasal stuffiness preceding throat symptoms. A nonproductive (dry) cough, low-grade fever, and hoarseness may also be present. Most healthy adults recover within 1 week. - Cummings Otolaryngology, p. 1139
• Influenza: presents more abruptly with fever, chills, myalgia, headache, dry cough, and sore throat. Much more systemic than a common cold. - Harrison's Principles of Internal Medicine, 22E
• COVID-19: dry cough is one of the hallmark symptoms, often combined with sore throat, fever, fatigue, and loss of smell/taste.
• Infectious mononucleosis (EBV/glandular fever): classic triad of sore throat, fever, and lymphadenopathy - especially in young adults (15-24 years). Pharyngeal signs can resemble tonsillitis. - Scott-Brown's Otorhinolaryngology, p. 843

• Sore throat is prominent and often severe. Cough is typically absent or minimal - its absence actually increases the likelihood of strep. Symptoms include sudden-onset throat pain, fever, tonsillar exudates, and tender anterior cervical nodes.

• Mucus dripping down the throat from the nose or sinuses triggers both a dry cough and throat irritation. Common with allergic rhinitis and sinusitis.

• Acid reflux can cause chronic dry cough, laryngitis, hoarseness, and throat clearing - without any heartburn in up to 40% of cases ("silent reflux"). - Harrison's, Extraesophageal Syndromes

• Exposure to pollen, dust, smoke, dry air, or chemical fumes causes throat irritation and a dry, tickly cough.

• A class-effect dry cough occurs in 5-20% of patients. If you are on one of these blood pressure drugs, that is likely the cause.

• Dry cough may be the sole or predominant symptom, often worse at night or with exercise.

Key Features to Distinguish Viral vs. Bacterial Sore Throat

Red Flags - See a Doctor Urgently

• Difficulty swallowing or breathing
• Drooling / inability to open mouth (possible peritonsillar abscess or epiglottitis)
• Stridor (high-pitched breathing sound)
• Fever >39°C lasting >3 days
• Unilateral throat swelling
• Rash (scarlatiniform rash suggests strep; maculopapular rash may suggest viral exanthem)
• Symptoms in an immunocompromised person

Management

• Rest and adequate fluid intake
• Saline gargles - soothe the throat and reduce irritation
• Honey (1-2 teaspoons) - has evidence for soothing cough, especially at night
• Steam inhalation / humidifier - helps with dryness
• Over-the-counter remedies: decongestants (for nasal drip), antihistamines (for allergy), throat lozenges
• Paracetamol/ibuprofen - for pain and fever
• Antibiotics are NOT indicated for viral infections and will not help - Cummings Otolaryngology

• Elevate head of bed, avoid eating 2-3 hours before sleep
• Avoid triggers: fatty foods, caffeine, alcohol, citrus, spicy food
• Proton pump inhibitors (PPIs) if diagnosed

• Antihistamines, intranasal corticosteroids, avoid triggers

• Penicillin or amoxicillin (first-line); azithromycin if penicillin-allergic
• Complete the full antibiotic course to prevent rheumatic fever

• Switch to an ARB (angiotensin receptor blocker) - cough resolves within 1-4 weeks

When to Test

Disclaimer: This information is for educational purposes only. If symptoms are severe, worsening, or persistent (>10-14 days), or if you have any of the red flag features above, please consult a healthcare professional for proper evaluation.