When a Cough Just Will Not Quit
Most coughs resolve in a couple of weeks. When one drags on past eight weeks, we stop calling it a nuisance and start calling it chronic — and we owe it a real workup. Chronic cough is one of the most common reasons patients in St. Petersburg come to see me, and it is almost always treatable once we identify the driver. The challenge is that there is usually more than one.
Let's walk through how I evaluate a cough that has overstayed its welcome.
Red Flags First
Before we assume a benign cause, I make sure we are not missing something serious. The following symptoms change the conversation and usually prompt immediate imaging and referral:
- Coughing up blood (hemoptysis)
- Unintentional weight loss
- Fevers or night sweats
- Progressive shortness of breath
- New hoarseness lasting more than a few weeks
- Known smoking history with new or changing cough
Any of these warrants a chest x-ray, often a CT, and further workup. The MedlinePlus overview of cough has a clear summary of when cough becomes concerning, and the American Lung Association's chronic cough page is also excellent.
If smoking is in the picture, a cough that changes character is not something to watch. We address nicotine dependence and screen for COPD and lung cancer in the same visit.
The Big Three Benign Causes
In a non-smoker with a normal chest x-ray and no red flags, roughly 90% of chronic cough comes from one — or more commonly a combination — of three conditions:
- Upper airway cough syndrome (the artist formerly known as postnasal drip)
- Asthma, including cough-variant asthma
- Gastroesophageal reflux disease (GERD)
These overlap more than most patients realize. It is not unusual to have all three at once.
1. Upper Airway Cough Syndrome
Classic clues: a sensation of mucus dripping down the back of your throat, frequent throat clearing, a cough that is worse when lying flat, and a history of allergies or sinusitis. In Florida, this is the single most common driver I see — our pollen, humidity, and year-round allergens keep noses running constantly. The guide to Florida pollen season goes deeper on seasonal triggers.
This overlaps heavily with postnasal drip syndrome and rhinitis.
2. Asthma and Cough-Variant Asthma
Classic clues: cough triggered by exercise, cold air, laughter, or perfumes; a sensation of chest tightness; wheezing even if intermittent; worsening at night. Cough-variant asthma can present with cough as the only symptom — no wheezing at all. Asthma is especially unforgiving in our humid summers; our piece on managing asthma and COPD in humid St. Pete explains why.
3. GERD and Silent Reflux
Classic clues: cough worse at night or after meals, hoarseness, sour taste, throat clearing, or symptoms aggravated by lying down. Many patients with reflux-driven cough have no heartburn at all (silent reflux). GERD is a quiet but common cough culprit.
Empiric Stepwise Treatment
Because formal testing for each cause can be expensive and slow, we typically treat empirically in a structured sequence — and reassess after each step.
- Step 1: Upper airway. Intranasal steroid such as fluticasone daily, plus a non-sedating antihistamine. Give it 4 weeks.
- Step 2: Asthma. Inhaled corticosteroid trial, sometimes with a bronchodilator. Montelukast is a reasonable add-on in the allergy-dominant patient. Consider spirometry.
- Step 3: Reflux. A twice-daily PPI trial such as omeprazole, combined with lifestyle measures (elevate head of bed, no food within 3 hours of lying down, reduce alcohol and late caffeine). Give it 8 weeks.
If each step partially helps, you may be dealing with all three. MedlinePlus on cough has a helpful overview of these steps.
Do Not Forget the ACE Inhibitor Cough
If you take lisinopril, enalapril, or another ACE inhibitor, 5 to 20% of patients develop a dry, tickling cough that can start months after you began the medication. The fix is straightforward: switch to an ARB like losartan. This is worth checking before any other workup.
When to Refer
- Pulmonology for abnormal imaging, persistent symptoms after full empiric therapy, suspected chronic bronchitis or bronchiectasis, or smoking history
- ENT for hoarseness, suspected vocal cord dysfunction, or refractory postnasal symptoms
- Gastroenterology for refractory reflux, dysphagia, or suspected eosinophilic esophagitis
Small Habits That Help
- Use a saline sinus rinse daily during pollen season
- Stay hydrated — humidity dries you out more than you think
- Avoid late meals and alcohol close to bedtime
- Treat allergies proactively, not reactively
- Quit smoking — it is the single most effective intervention for most chronic coughs
When the Workup Is Negative and the Cough Stays
Some patients do everything right, complete all three empiric trials, have a clean chest x-ray, and still cough. That is a recognized situation with its own explanations, and it is not a sign the workup was wasted.
Post-infectious cough and a hypersensitive cough reflex
After a bad respiratory infection, the airway lining and the nerves that trigger coughing stay irritable long after the virus is gone. A post-infectious cough can run for weeks, and the tell is that it started with an obvious illness and is slowly, if unevenly, improving. When chronic cough persists past that, we start thinking about cough hypersensitivity: a reflex that has been sensitized so that talking, laughing, cold air, or a strong scent sets it off. It is more common in women over fifty, often follows a viral illness, and it responds to different tools than allergy or reflux treatment.
Speech therapy for the cough reflex
This surprises people, but speech-language pathologists treat refractory cough, and the evidence behind it is reasonable. The program teaches cough suppression techniques, breathing patterns that interrupt the reflex, hydration and laryngeal care, and strategies for the specific triggers that set you off. It pairs well with treating laryngeal reflux disease (LPR), which often coexists and which does not cause heartburn. The NIDCD's guidance on taking care of your voice covers the same laryngeal care principles. Our ENT team coordinates these referrals when the larynx is clearly part of the story.
The indoor-air angle in a Florida house
Before I call a cough refractory, I ask about the house. Air conditioning runs nearly year-round here, and a system with a damp drain pan, a neglected filter, or duct condensation quietly seeds a home with mold spores. The EPA's page on mold and health explains what actually matters, which is fixing moisture rather than testing spores. Outdoor air matters too; our articles on air conditioning and indoor air quality in Pinellas County and on wildfire smoke and Saharan dust cover the seasonal exposures we see. One more thing I check in a stubborn nighttime cough is obstructive sleep apnea, which aggravates reflux and throat irritation and is easy to miss.
When to Come In
If your cough has lasted more than eight weeks, is disrupting sleep, is interfering with conversation or work, or is accompanied by any red-flag symptoms, please do not keep pushing through.
Let's find the cause, not just silence the symptom. Schedule a visit with Zimmer Medical Group and we will put together a systematic plan to get your airway — and your voice — back.
