A cough that won’t quit is more than just a nuisance—it’s often a sign that something deeper is going on. At Sangdo Woori Internal Medicine, we frequently see patients who’ve been coughing for weeks or even months, despite antibiotics, inhalers, or home remedies. They’re often surprised when we trace the issue not to the lungs—but to the nose, throat, or even the stomach.

To be medically precise, a chronic cough is one that lasts more than eight weeks in adults (or over four weeks in children). While many immediately think of lung issues or infections, a large proportion of chronic coughs originate from ENT-related causes—that is, conditions affecting the ear, nose, and throat.

Understanding the ENT connection can be a game-changer in treating persistent cough. Let’s explore what causes it, how it’s diagnosed, and what we can do to finally silence that stubborn tickle.

Post-Nasal Drip / Upper Airway Cough Syndrome (UACS)

One of the most common—and most underrecognized—ENT causes of chronic cough is post-nasal drip, now often referred to as Upper Airway Cough Syndrome (UACS). This occurs when excessive mucus, often triggered by allergies, chronic sinusitis, or environmental irritants, drips from the nose or sinuses into the back of the throat.

You might not even feel it happening. But that constant drip stimulates nerve endings in the throat, triggering a cough reflex.

Symptoms often include:

A constant need to clear your throat
A “tickle” or feeling of mucus in the throat
Hoarseness or throat irritation
Worse symptoms when lying down or in dry environments

In Korea, seasonal changes and exposure to fine dust (미세먼지) can exacerbate allergic rhinitis or chronic sinus inflammation, increasing post-nasal drip. That’s why we see an uptick in cough-related complaints during spring and fall.

At Sangdo Woori Internal Medicine, we often ask: Do you wake up with mucus in your throat? Does your cough get worse at night? If so, UACS could be the culprit. Treatments often involve intranasal steroids, antihistamines, saline irrigation, and avoiding triggers like smoke or perfume.

GERD and Laryngopharyngeal Reflux (LPR)

Another silent but powerful trigger is acid reflux—but not necessarily the kind that causes heartburn. Laryngopharyngeal reflux (LPR) occurs when stomach acid travels up into the throat or voice box, irritating sensitive tissue and triggering a dry, persistent cough.

Unlike classic GERD, LPR may not involve chest pain or indigestion. Instead, patients notice:

A scratchy or hoarse voice
Throat clearing after meals
A sensation of a lump in the throat (globus)
Coughing when lying flat

Because the signs are subtle, LPR is often misdiagnosed or overlooked. At our clinic, we frequently see patients referred for lung issues when the real trigger is reflux irritating the upper airway.

Treatment includes proton pump inhibitors (PPIs), dietary adjustments (avoiding spicy, fried, or acidic foods), and behavioral changes—like not eating before bed or elevating the head while sleeping. In stubborn cases, we coordinate with gastroenterologists for further evaluation.

Cough-Variant Asthma and Eosinophilic Bronchitis

When a chronic cough isn’t linked to a cold or infection, people often fear the worst—like cancer or lung disease. But surprisingly, asthma can present as a cough alone, without the wheezing or shortness of breath most associate with it. This is known as cough-variant asthma.

Common triggers include:

Cold air
Exercise
Exposure to allergens
Nighttime

In a related condition called eosinophilic bronchitis, chronic coughing results from eosinophilic inflammation of the airways—without the airway constriction seen in classic asthma. These patients may have normal lung function tests, which is why their symptoms are sometimes dismissed.

Fortunately, both conditions usually respond well to inhaled corticosteroids or bronchodilators. At Sangdo Woori, we use pulmonary function testing, allergy screening, and sometimes a trial of inhaled therapy to pinpoint the diagnosis.

Chronic Sinusitis and Nasal Inflammation

Longstanding inflammation in the sinuses—whether from infection, allergy, or anatomical issues—can fuel a chronic cough through both mucus drainage and local irritation.

Symptoms may include:

Facial pressure or sinus pain
Thick nasal discharge (sometimes discolored)
Poor sense of smell
Nasal congestion

In Korea, chronic sinusitis is especially common in people with narrow nasal passages, frequent colds, or untreated allergic rhinitis. It’s also frequently underdiagnosed because the symptoms can be subtle or dismissed as "just a runny nose."

Treatment may involve a combination of saline irrigation, topical steroids, antibiotics (if bacterial), and, in some cases, referral for imaging or ENT intervention. At Sangdo Woori, we perform targeted sinus assessments and guide patients through both medical and lifestyle strategies to relieve long-term sinus inflammation.

Vocal Cord Dysfunction and Throat Hyperreactivity

When coughing doesn’t improve with standard treatments, we start looking at the throat itself. Vocal cord dysfunction (VCD) or laryngeal hypersensitivity involves abnormal movements or heightened sensitivity of the vocal cords, which can cause a reactive cough even to mild irritants like talking, laughing, or cold air.

Clues include:

Coughing during speech or laughter
Voice changes or throat tightness
No improvement with asthma medications
Stress-related flare-ups

These conditions are often stress-sensitive and can benefit from speech therapy, vocal hygiene education, and in some cases, anti-reflux or anti-inflammatory treatments. ENT evaluation with laryngoscopy is key for diagnosis.

Medication-Induced Cough (ACE Inhibitors)

A common and often overlooked cause of chronic cough is medication—particularly ACE inhibitors, which are frequently prescribed for high blood pressure or heart failure.

Even if you’ve been taking the medication for months without issues, a dry, persistent cough can develop unexpectedly. Switching to a different class of blood pressure medication usually resolves the symptoms within a week or two.

At Sangdo Woori, we always review medication history carefully, especially in older adults managing multiple prescriptions.

When It’s Not ENT: Other Causes to Consider

While many chronic coughs are ENT-related, some important non-ENT causes need to be ruled out, including:

Chronic bronchitis or COPD, especially in smokers
Bronchiectasis, a lung condition with persistent phlegmy cough and recurrent infections
Tuberculosis, still relevant in Korea and requiring a high index of suspicion
Pertussis (Whooping Cough), which can cause months-long coughing fits in adults

A thorough medical evaluation—including imaging, lab work, and sometimes specialist referral—is crucial to rule these out.

How ENT Doctors and Internal Medicine Work Together

At Sangdo Woori Internal Medicine, we don’t stop at “try this medicine and come back if it doesn’t work.” We believe in getting to the root of the problem.

That often means:

Nasal endoscopy to inspect sinuses or the throat
Laryngoscopy to assess the vocal cords and upper airway
Pulmonary function tests
Reflux evaluation
Allergy testing

We frequently collaborate with ENT specialists, pulmonologists, and GI doctors to build a full picture. Chronic cough is not just a symptom—it’s a diagnostic puzzle. And patients benefit most when care is coordinated and comprehensive.

Dr. Yoo’s Perspective: What We See at Sangdo Woori

Dr. Yoo Du-yeol, founder of Sangdo Woori Internal Medicine, often says:

“When patients say, ‘I’ve had this cough for months and no one can figure it out,’ that’s when we dig deeper. Often it’s a post-nasal drip that was never treated properly—or reflux that’s silently irritating the throat. Once we treat the actual cause, the relief is immediate.”

In our clinic, we’ve helped countless patients who were stuck in a cycle of antibiotics and cough suppressants—without ever having their nose, throat, or stomach examined. By listening carefully and looking in the right places, we’ve helped many people finally stop coughing, sleep better, and speak without irritation.

When to Seek Help

If your cough has lasted more than eight weeks, or if you’re experiencing any of the following, it’s time to see a doctor:

Hoarseness or voice changes
Constant throat clearing
Feeling of mucus dripping in the throat
No improvement with standard treatments
History of reflux or sinus issues

A comprehensive evaluation that includes ENT causes can make all the difference.

Final Thoughts: Don’t Settle for a Lingering Cough

A persistent cough can chip away at your quality of life—interrupting sleep, causing embarrassment at work, and leaving you feeling tired and frustrated. The good news is, most chronic coughs are treatable, especially when ENT causes are carefully considered.

If you’ve been coughing for weeks with no clear reason—or if your cough seems worse with lying down, eating, or being exposed to dust or allergens—it may be time for a deeper look.

At Sangdo Woori Internal Medicine in Dongjak-gu, Seoul, we provide thorough evaluations of chronic cough with a focus on ENT-related causes, reflux management, and chronic inflammation. Our goal is not just symptom relief—but helping you breathe, sleep, and speak comfortably again.

Don’t wait it out. If your cough has overstayed its welcome, come see us. Let’s find the cause—and solve it.