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Postnasal Drip Treatment in Gangnam, Seoul

Medically reviewed by Dr. Kim Yoo Suk, MD · Board-certified otolaryngologist · Former professor, Yonsei & Ajou University · Consultations in English

What is postnasal drip?

Postnasal drip is a feeling of excess or thick mucus collecting at the back of the nose and throat. The nose and sinuses normally produce mucus every day, which is swallowed without notice. Postnasal drip becomes bothersome when mucus increases, thickens, or when the throat becomes more sensitive to normal amounts.

Internationally, the related term upper airway cough syndrome is used when this drainage is linked to chronic cough.

Symptoms

• Constant need to clear the throat or swallow
• Cough, often worse at night or on waking
• Tickle, irritation or mild soreness in the throat
• Feeling of something stuck in the throat
• Hoarseness or bad breath
• Nausea from swallowed mucus in the morning

Common causes

• Allergic rhinitis – usually thin, clear mucus with sneezing
• Vasomotor rhinitis – watery drip triggered by cold air, spicy food or odors
• Chronic sinusitis – thick, discolored mucus with blockage or reduced smell
• Viral infections, where drip can linger for weeks after a cold
• Laryngopharyngeal reflux – acid irritation that makes the throat feel mucus-filled even without nasal disease
• Dry air, dehydration and some medicines

How it is diagnosed at our Gangnam clinic

Because the cause may lie in the nose, sinuses or throat, Dr. Kim examines both. Nasal endoscopy shows whether mucus is coming from the sinus drainage pathways or reflects swollen, allergic-looking mucosa. Laryngoscopy checks the larynx for signs of reflux irritation or other throat conditions. An allergy test or sinus CT may be added if the findings point that way.

Treatment options

Treatment targets the underlying cause:

• Saline irrigation to thin and clear mucus – helpful for almost everyone
• Intranasal corticosteroids for allergic or inflammatory rhinitis and sinusitis
• Antihistamines for allergic causes, or an ipratropium nasal spray for watery non-allergic drip
• Antibiotics only when bacterial sinusitis is confirmed
• Reflux management – raising the head of the bed by about 15 cm, avoiding late meals and taking medication, typically for three to six months
• Hydration and humidification, especially in dry seasons

Surgery is rarely needed for postnasal drip itself, but endoscopic sinus surgery may be considered if chronic sinusitis does not respond to medication.

When to see an ENT

See an ENT if postnasal drip lasts more than three or four weeks, disrupts sleep, or comes with a persistent cough. Seek prompt care for blood-stained mucus, difficulty swallowing, unexplained weight loss, a neck lump, or hoarseness lasting more than three weeks, particularly if you smoke.

Seeing Dr. Kim in English

Although a nose and sinus subspecialist, Dr. Kim Yoo Suk treats the full range of ear, nose and throat problems, which matters for a symptom that bridges the nose and throat. The former Yonsei and Ajou professor consults in English; see our guide for English-speaking patients.

Frequently asked questions

Does mucus color mean I need antibiotics?

Not necessarily. Yellow or green mucus reflects immune cells and can occur with viral infections and allergies. Antibiotics are considered when there are signs of bacterial sinusitis, such as symptoms beyond 10 days or worsening after improvement, not based on color alone.

Can reflux really cause postnasal drip?

Yes. Laryngopharyngeal reflux irritates the throat and larynx, triggering mucus production and throat clearing that feel identical to postnasal drip. If the nose looks normal on endoscopy, Dr. Kim may examine the larynx for reflux signs.

How long does postnasal drip last after a cold?

Drip after a viral cold commonly lasts one to three weeks as the lining recovers. If it persists beyond about four weeks, worsens, or comes with facial pain, fever or blocked nose, an ENT examination is worthwhile to check for sinusitis or rhinitis.

This page is general medical information written and reviewed by an ENT specialist. It is not a diagnosis. Symptoms differ between people — please see a doctor for an examination. In an emergency in Korea, call 119.