Chronic Cough: Causes, Symptoms, Diagnosis, and Treatment (2026 Guide)
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD. Last updated: September 2026.
TL;DR
A chronic cough is a cough that lasts eight weeks or longer in adults, or four weeks in children. It is more than a nuisance: it can disrupt sleep, drain your energy, and in severe cases cause vomiting, dizziness, or even a broken rib. The most common causes are postnasal drip, asthma, acid reflux (GERD), tobacco use, lingering infections, and ACE inhibitor blood pressure medicines, and more than one cause is often at work at the same time. Finding and treating the underlying cause is the key, because chronic cough usually goes away once the underlying issue is treated.
Quick Answer
What is a chronic cough?
A cough lasting 8 weeks or more in adults (4 weeks or more in children), usually signaling an underlying health issue rather than a simple cold.
The most common causes are postnasal drip, asthma, acid reflux (GERD), tobacco use, infections that linger, and ACE inhibitor blood pressure drugs.
It is diagnosed through medical history, exam, and testing such as chest X-rays, CT scans, spirometry, and sometimes bronchoscopy; doctors often treat the most likely cause first.
Treatment targets the cause: allergy medicines for postnasal drip, inhaled asthma medicines, acid blockers for reflux, smoking cessation, switching medications, or antibiotics for infections.
What Is a Chronic Cough?
A chronic cough is a cough that lasts eight weeks or longer in adults, or four weeks in children. A cough that happens once in a while is common and healthy: it clears irritants and mucus from your lungs and helps prevent infection. But a cough that lasts for weeks is usually due to a health concern.
A chronic cough is more than just annoying. It can interrupt your sleep and leave you feeling very tired. Severe cases can cause vomiting and lightheadedness, and even break a rib. The good news is that chronic cough usually goes away once the underlying issue is treated.
What Are the Symptoms?
A chronic cough can occur alongside other symptoms. These accompanying signs often give important clues about the cause.
Accompanying symptom | What it may suggest |
Runny or stuffy nose | Postnasal drip from allergies or sinus irritation |
Feeling of liquid running down the back of the throat | Postnasal drip (upper airway cough syndrome) |
Frequent throat clearing | Postnasal drip or irritation in the throat |
Sore throat | Postnasal drip, dryness, or irritation |
Hoarseness | Acid reflux irritating the throat |
Wheezing and shortness of breath | Asthma or COPD |
Heartburn or a sour taste in the mouth | Gastroesophageal reflux disease (GERD) |
Coughing up blood (rare) | A sign that needs prompt medical evaluation |
What Causes a Chronic Cough?
Most cases of chronic cough are due to a handful of common causes, which can occur alone or together. Many times, more than one health concern causes the cough.
Postnasal drip. When your nose or sinuses produce extra mucus, it can drip down the back of your throat and cause you to cough. This condition is also called upper airway cough syndrome.
Asthma. An asthma-related cough may come and go with the seasons. It may appear after an upper respiratory tract infection, or it can get worse when you are exposed to cold air or certain chemicals or fragrances. In one type of asthma known as cough-variant asthma, a cough is the main symptom.
Gastroesophageal reflux disease (GERD). In this common condition, stomach acid flows back into the tube that connects your stomach and throat, called the esophagus. The constant irritation can lead to chronic coughing. Then the coughing can make GERD worse, creating a vicious cycle.
Infections. A cough can last long after other symptoms of pneumonia, flu, a cold, or another upper respiratory infection have gone away. A common cause of chronic cough in adults that often is not recognized is whooping cough, also known as pertussis. Chronic cough also can occur with fungal infections of the lung, tuberculosis infection (TB), or lung infection with nontuberculous mycobacteria (NTM), which are found in soil, water, and dust.
Chronic obstructive pulmonary disease (COPD). This is a lifelong inflammatory lung disease that limits airflow from the lungs. COPD includes chronic bronchitis and emphysema. Chronic bronchitis can cause a cough that brings up colored sputum. Emphysema causes shortness of breath and damages the air sacs in the lungs, called alveoli. Most people with COPD are current or former smokers.
Blood pressure drugs. Angiotensin-converting enzyme inhibitors, called ACE inhibitors, which are commonly prescribed for high blood pressure and heart failure, are known to cause chronic cough in some people.
Less commonly, chronic cough may be caused by aspiration (when food or other items are swallowed or inhaled and go into the lungs), bronchiectasis (widened and damaged airways that slowly lose the ability to clear out mucus), bronchiolitis (an infection causing swelling, irritation, and mucus buildup in the small airways), cystic fibrosis, idiopathic pulmonary fibrosis (gradual lung damage and scarring of unknown cause), lung cancer, nonasthmatic eosinophilic bronchitis (inflamed airways without asthma), and sarcoidosis (groups of inflamed cells forming lumps, most often in the lungs).
Cause | How it produces the cough | Typical clues |
Postnasal drip | Extra mucus drips down the back of the throat | Runny or stuffy nose, throat clearing, sore throat |
Asthma | Airway inflammation and reactivity | Wheezing, shortness of breath, worse with cold air or fragrances |
GERD (acid reflux) | Stomach acid irritates the esophagus | Heartburn, sour taste, hoarseness |
Tobacco use | Irritation and lung damage | Current or former smoker; secondhand smoke exposure |
Lingering infections | Post-infectious cough after pneumonia, flu, or cold | Cough persisting after other symptoms resolve |
ACE inhibitor drugs | A side effect of some blood pressure medicines | Cough beginning after starting the drug |
Who Is at Higher Risk?
Being a current or former smoker is one of the leading risk factors for chronic cough. Exposure to a lot of secondhand smoke also can lead to coughing and lung damage.
What Complications Can a Chronic Cough Cause?
Having a cough that does not stop can be very tiring. Persistent coughing can cause sleep disruption, headache, dizziness, vomiting, heavy sweating, unintended bladder loss (urinary incontinence), broken ribs, and passing out (syncope).
When Should You See a Doctor?
See your healthcare professional if you have a cough that lasts for weeks, especially one that brings up sputum or blood, disturbs your sleep, or affects school or work.
How Is a Chronic Cough Diagnosed?
Your healthcare professional asks about your medical history and does a physical exam. A thorough medical history and physical exam can give important clues about a chronic cough. Tests may then be ordered to look for the cause.
Notably, many health professionals start treatment for one of the common causes of chronic cough rather than ordering expensive tests. If the treatment does not work, you may be tested for less common causes.
Imaging tests. Although a routine chest X-ray will not reveal the most common reasons for a cough (postnasal drip, acid reflux, tobacco use, or asthma), it may be used to check for lung cancer, pneumonia, and other lung diseases. An X-ray of your sinuses may reveal evidence of a sinus infection. CT scans may be used to check your lungs for conditions that produce chronic cough or your sinus cavities for pockets of infection.
Lung function tests. Simple, noninvasive tests such as spirometry measure how much air your lungs can hold and how fast you can exhale. A spirometer measures the amount of air you can breathe in and out and the time it takes to breathe out completely after a deep breath. Spirometry is used to diagnose asthma and COPD. Your healthcare professional may also request an asthma challenge test, which checks how well you can breathe before and after inhaling the drug methacholine.
Lab tests. If the mucus you cough up is colored, your healthcare professional may test a sample of it for bacteria.
Scope tests. If the cause cannot be found, scope tests may be used. A bronchoscopy uses a thin, flexible tube with a light and camera to look at your lungs and air passages, and a biopsy can be taken from the airway lining. A rhinoscopy uses a fiberoptic scope to view your nasal passageways, sinuses, and upper airway.
In children, a chest X-ray and spirometry, at a minimum, are usually ordered to find the cause of a chronic cough.
How Is a Chronic Cough Treated?
Finding out what is causing a chronic cough is very important to effective treatment. In many cases, more than one underlying condition may be causing your cough.
If you smoke, your healthcare professional likely will talk with you about your readiness to quit and give advice on how to achieve this goal. If you are taking an ACE inhibitor medicine, your doctor may switch you to another medicine that does not have cough as a side effect.
Treatment | Used for | What it does |
Antihistamines, corticosteroids, decongestants | Allergies and postnasal drip | Standard treatment; reduces mucus and irritation |
Inhaled asthma medicines | Asthma-related cough | Corticosteroids and bronchodilators reduce inflammation and open airways |
Antibiotics | Bacterial, fungal, or mycobacterial infections | Treats the infection causing the cough |
Acid blockers | Acid reflux not controlled by lifestyle changes | Blocks acid production; some people need surgery |
Cough suppressants | Symptom relief while the cause is being found | Reduces coughing; not recommended for children |
Medicines used to treat chronic cough include antihistamines, corticosteroids, and decongestants as standard treatment for allergies and postnasal drip; inhaled corticosteroids and bronchodilators as the most effective treatments for asthma-related cough; antibiotics if a bacterial, fungal, or mycobacterial infection is causing the cough; and acid blockers when lifestyle changes do not take care of acid reflux, with surgery needed by some people.
While finding the cause, your healthcare professional may prescribe a medicine to reduce coughing, called a cough suppressant. Cough suppressants are not recommended for children.
A word of caution on store-bought options: over-the-counter cough and cold medicines treat the symptoms of coughs and colds, not the underlying disease. Research suggests these medicines do not work any better than no medicine at all. They are not recommended for children because of potentially serious side effects, including fatal overdoses in children younger than 2 years old. As a general rule, avoid them for children younger than 6 years old except for fever reducers and pain relievers, and avoid them for children younger than 12 years old unless your healthcare professional advises otherwise.
What Home Remedies Can Soothe a Cough?
Follow the plan your healthcare professional gives you for treating the cause of your cough. In the meantime, these tips can ease your cough:
Drink fluids. Liquid helps thin the mucus in your throat. Warm liquids, such as broth, tea, or juice, can soothe your throat.
Suck on cough drops or hard candies. They may ease a dry cough and soothe an irritated throat.
Consider taking honey. A teaspoon of honey may help loosen a cough. Do not give honey to children younger than 1 year old, because honey can contain bacteria harmful to infants.
Moisturize the air. Use a cool-mist humidifier or take a steamy shower.
Avoid tobacco smoke. Smoking or breathing secondhand smoke irritates your lungs and can worsen coughs. If you smoke, talk with your healthcare professional about programs and products that can help you quit.
How Should You Prepare for a Doctor's Appointment?
You may see your family healthcare professional first, but you may need to see a doctor who specializes in lung disorders, known as a pulmonologist.
Before your appointment, make a list that includes detailed descriptions of your symptoms; information about medical problems you have had; information about the medical problems of your parents or siblings; all the medicines you take, including those available without a prescription, vitamins, herbal preparations, and dietary supplements; your smoking history; and your questions.
Your healthcare professional may ask some of these questions: What are your symptoms and when did they begin? Did you recently have the flu or a cold? Do you smoke or have you ever smoked? Does anyone in your family or workplace smoke? Are you exposed to dust or chemicals at home or at work? Do you have heartburn? Do you cough up anything, and what does it look like? Do you take blood pressure medicine, and what type? When does your cough occur? Does anything relieve your cough, and what treatments have you tried? Do you get short of breath or wheeze when moving around or exposed to cold air? What is your travel history?
Conclusion
A cough that refuses to leave is rarely just stubborn mucus. Once a cough passes the eight-week mark in adults (four weeks in children), it is usually a message from your body that something underlying needs attention, and often the clue is hidden in the symptoms that travel with it. A sour taste and heartburn point toward acid reflux. Wheezing and a cough that flares in cold air point toward asthma. A tickle that keeps sending you to clear your throat points toward postnasal drip. And if you take an ACE inhibitor for blood pressure, the medicine itself may be the culprit.
The encouraging news is that chronic cough is very often treatable, because it usually resolves once the underlying issue is addressed. Doctors commonly try treatment for the most likely cause before ordering extensive testing, which keeps the path to relief practical and affordable. In the meantime, warm fluids, honey (for those over one year old), humidified air, and staying away from smoke can take the edge off while you and your doctor get to the bottom of it.
Coughing for weeks on end? Talk with your healthcare professional about how long it has lasted, what seems to trigger it, and what other symptoms you have noticed. Bring your full medication list, including blood pressure drugs and over-the-counter products, since the answer may be simpler than you expect.
Frequently Asked Questions
How long does a cough have to last to be considered chronic?
Eight weeks or longer in adults, and four weeks or more in children. A cough lasting this long usually points to an underlying health concern rather than a simple cold.
What are the most common causes of chronic cough?
Postnasal drip, asthma, acid reflux (GERD), tobacco use, lingering infections (including unrecognized whooping cough), and ACE inhibitor blood pressure medicines. More than one cause is often present at the same time.
Can acid reflux really cause a cough?
Yes. Stomach acid flowing back into the esophagus causes constant irritation that leads to chronic coughing, and the coughing can in turn make GERD worse, creating a vicious cycle.
Is a chronic cough dangerous?
The cough itself is usually not dangerous, but it can cause exhausting complications including sleep disruption, dizziness, vomiting, urinary incontinence, passing out, and even broken ribs. Coughing up blood always warrants prompt medical evaluation.
How is chronic cough diagnosed?
Through medical history, physical exam, and tests such as chest X-rays, CT scans, spirometry (a lung function test), mucus testing, and sometimes an asthma challenge test or scope exams such as bronchoscopy and rhinoscopy. Doctors often treat the most likely cause first.
Do over-the-counter cough medicines work?
Research suggests over-the-counter cough and cold medicines do not work any better than no medicine at all, and they are not recommended for children. Prescription treatment targeting the underlying cause is more effective.
What home remedies help while waiting for treatment to work?
Drink warm fluids, try a teaspoon of honey (never for children under 1 year), use a humidifier or take a steamy shower, suck on cough drops, and avoid all tobacco smoke.
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References
This article is based on medically reviewed clinical information, including Chronic cough — Symptoms & causes and Chronic cough — Diagnosis & treatment, supplemented by the American Lung Association's overview of chronic cough and the National Heart, Lung, and Blood Institute's COPD overview.
This article is for educational purposes only and is not a substitute for professional medical advice. A persistent cough, especially one producing blood, disrupting sleep, or lasting more than 8 weeks in adults (4 weeks in children), should be evaluated by a qualified healthcare professional.
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