TürkçeChronic cough is a persistent respiratory symptom that lasts longer than eight weeks and occurs as a sign of an underlying disease. The most common causes include upper respiratory tract diseases, asthma, gastroesophageal reflux, and chronic bronchitis. A persistent cough always requires medical evaluation.
Upper airway cough syndrome holds an important place among the causes of chronic cough and develops due to postnasal drip. Allergic rhinitis, sinusitis, and environmental irritants may trigger this condition. A constant need to clear the throat and a cough that worsens at night are evaluated among the clinical findings.
In response to the question of which diseases a persistent cough may indicate, asthma and reflux disease stand out. In asthma, narrowing of the airways may manifest as coughing. The escape of stomach acid into the esophagus due to reflux causes a dry cough that particularly worsens while lying down.
The treatment of a long-lasting cough is planned according to the underlying cause and requires comprehensive diagnostic evaluation. Chest X-ray, pulmonary function tests, and advanced imaging methods are performed when necessary. Cause-specific medical treatment provides symptom control and improvement in quality of life.
When does chronic cough (persistent cough) become dangerous?
Cough is essentially one of the body’s most loyal guardians. It is a remarkable defense mechanism designed to expel a piece of food, dust, or accumulated mucus that enters the airways. However, when this guardian begins barking constantly even though there is no visible threat, in other words, when the cough becomes chronic, the situation changes. Our patients generally come with the complaint, “I think I have recovered, but it starts again every morning.” At this point, what is important for us is the duration of the cough and the other silent but dangerous warning signs accompanying it.
Especially in individuals with a history of smoking or those working in certain occupational groups, even a simple cough should be taken seriously. Any cough that does not respond to standard treatments, antibiotics, or bronchodilators deserves a detailed examination within the discipline of thoracic surgery. Sometimes a tiny shadow seen on a chest X-ray, or sometimes a lesion growing inside the airway without producing any radiological finding, may be the source of this cough.
Some of the conditions in which alarm bells ring from the perspective of thoracic surgery and which we describe as “red flags” are as follows:
- Bloody sputum
- Unintentional weight loss
- Night sweats
- Hoarseness
- Difficulty swallowing
- Chest pain
- Shortness of breath
- Recurrent pneumonia
How does the cough mechanism in our body work and where does it malfunction?
To understand this process, it is necessary to imagine the inside of the rib cage as a security network equipped with sensitive sensors. These sensors are located not only in the trachea but also in the pleura, pericardium, esophagus, diaphragm muscle, and even the ear canal. Under normal circumstances, when these sensors detect a foreign substance, they send a “danger” signal to the brain. The brain then gives the abdominal and chest muscles the command to “contract.” The vocal cords close, tremendous pressure builds up inside, and then they suddenly open, expelling air outward at an explosive speed. This is the event we call coughing.
In the cases we encounter in our specialty, the problem is usually the “mechanical” irritation of these sensors. While pulmonologists deal more with chemical or inflammatory processes such as asthma or infection, we surgeons deal with physical compression. For example, a cyst growing in the area between the two lungs, which we call the “mediastinum,” may be physically touching the trachea from the outside. Or the vocal cord nerve passing immediately beside the main trachea may be compressed by a lymph node. In such mechanical stimulation, the effect of cough suppressants is very limited because there is physical contact. Unless that contact is eliminated, in other words, unless the pressure is removed through surgical intervention, it is not possible for the brain to stop issuing the cough command.
When does a Thoracic Surgery specialist become involved in a cough complaint?
From a hierarchical perspective, a patient presenting with a cough complaint is generally first evaluated by a family physician or pulmonologist. This is a very correct approach. This is because the three most common causes of chronic cough are postnasal drip, asthma, and reflux. However, if the patient’s complaints do not improve despite strictly following treatments directed at these diagnoses, it is time to move beyond this trio, which we call the “pathogenic triad,” and look deeper.
A thoracic surgery specialist becomes involved at exactly this point in “undiagnosed” or “treatment-resistant” cases. When a suspicious mass, nodule, cyst, or structural disorder is seen on a chest X-ray or computed tomography scan, a surgical opinion is essential. However, sometimes even if radiology is completely clear, the patient’s history may make us suspicious. For example, in a patient who has smoked for years and whose cough characteristics have recently changed, such as “it used to be productive, now it is dry and painful,” we may feel the need to examine the inside of the airway, the endobronchial area.
The main pathologies requiring the involvement of a surgeon are as follows:
- Lung tumors
- Mediastinal masses
- Bronchiectasis
- Lung abscess
- Hydatid cyst
- Tracheal stenosis
- Foreign body aspiration
- Diaphragmatic eventration
What does the EBUS method (Endobronchial Ultrasound) provide patients in diagnosis?
One of the greatest gifts technology has offered thoracic surgery is undoubtedly the EBUS device. Everyone may have heard of classic bronchoscopy, the thin tube with a light and camera at its tip that allows us to view the inside of the trachea. Bronchoscopy shows the walls inside the tunnel remarkably well. However, for a thoracic surgeon, what lies immediately behind the tunnel wall may sometimes be far more critical. EBUS is a tiny ultrasound device added to the tip of this camera. In this way, while inside the airway, we can clearly see the lymph nodes, vessels, and masses behind the wall and obtain samples from them.
In the past, to obtain a tissue sample from lymph nodes inside the rib cage, we would take the patient to the operating room, make an incision in the neck, and perform a more extensive procedure called “mediastinoscopy.” Thanks to EBUS, we can now spare our patients this surgical stress. The procedure is performed under light sleep, or sedation, there is no incision, and the patient can return home on the same day. Especially in suspected lung cancer or in differentiating diseases such as tuberculosis and sarcoidosis, EBUS is indispensable to us:
The advantages that the EBUS method provides to patients are as follows:
- Incision-free procedure
- Painless process
- Rapid discharge
- High diagnostic success
- Low risk of complications
- No requirement for general anesthesia
What is the relationship between lung cancer and persistent cough?
As a physician, it is always difficult to say this, but facing the facts saves lives: Chronic cough is the most common initial symptom of lung cancer. While the tumor grows silently inside the lung, it may sometimes cause no pain. However, once it grows into an airway or compresses and narrows a bronchus from the outside, coughing begins. This is the lung’s attempt to say, “There is something here that should not be here, expel it.”
In early-stage lung cancer, surgery is the most powerful weapon that can provide complete recovery for the patient. If a patient comes to us with a cough complaint and is diagnosed at an early stage, we can remove the tumorous area and offer the patient a cancer-free life. The extent of surgery varies depending on the location of the tumor. Sometimes it is necessary to remove an entire lobe of the lung, which we call a “lobectomy,” while sometimes removing more limited areas, or segmentectomy, may be sufficient. The critical message here is this: Seeing the cough merely as an “irritation” and postponing it may cause the tumor to grow and the chance for surgery to be lost. Early diagnosis completely changes the rules of the game in lung cancer.
Why is Video-Assisted Thoracoscopic Surgery (VATS) important for patients?
Traditional thoracic surgery, or “open surgery,” can be quite frightening for patients. A large incision is made to open the space between the ribs, and the ribs are stretched with metal retractors. This may cause severe postoperative pain and long recovery periods. However, with the VATS method, or Video-Assisted Thoracoscopic Surgery, which has become standard in recent years, this situation has completely changed.
In the VATS method, we make 1 to 3 small openings in the patient’s chest, each ranging from only 1 to 3 centimeters. Through these openings, we insert a high-resolution camera and fine surgical instruments. We do not separate the ribs or cut the muscles. By viewing the inside of the lung with tremendous magnification on a screen, we can safely perform even the most delicate maneuvers. Removing a mass or damaged lung section causing chronic cough with this method increases patient comfort to an incredible degree.
The main benefits provided by the VATS method are as follows:
- Less pain
- Smaller scar
- Faster recovery
- Shorter hospital stay
- Less blood loss
- Earlier return to work
Why does bronchiectasis (airway dilation) cause a persistent productive cough?
Bronchiectasis is a condition in which the airways become permanently damaged and form sac-like enlargements. Normally, the airways gradually narrow like the branches of a tree, but in this disease, they widen and their structure deteriorates. The mucus accumulating in these enlarged pockets cannot be expelled by the patient through normal means. Over time, these accumulated secretions become a breeding ground for microorganisms and lead to continuous infections. The patient experiences severe coughing attacks every morning to clear the lungs and usually produces a large amount of sputum, which may sometimes have a foul odor.
We do not operate on every patient with bronchiectasis. Our priority is always medications, respiratory physiotherapy, and vaccination. However, if the disease is confined to only a specific part of the lung, meaning it is localized, and the patient has to use antibiotics continuously, surgery is the definitive solution. By removing the damaged lung section, usually a lobe or segment, that no longer functions and serves only as a source of infection, we free the patient from this vicious cycle. The sentence patients most frequently say after surgery is, “For the first time in years, I slept without coughing.”
How do mediastinal masses trigger coughing?
We call the area located exactly in the middle of the rib cage, between the two lungs, the “mediastinum.” This is the busiest intersection of the body; the heart, major vessels, esophagus, and trachea are located here. Any foreign formation occupying space in this narrow area disturbs its neighboring structures. Thymus gland tumors, which we call “thymomas,” are frequently seen in the anterior mediastinum, while congenital “bronchogenic cysts” are commonly seen in the middle mediastinum.
Bronchogenic cysts in particular are fluid-filled sacs that form in the wrong place during embryological development. They are generally attached to the main trachea or bronchi. As the cyst grows, it compresses the airway and causes a persistent, dry cough. Sometimes these cysts become infected and suddenly rupture, leading to more serious conditions. For this reason, we generally prefer to surgically remove cysts and masses detected in the mediastinum even if the patient has no complaints. This is because a mass in this region is like a ticking time bomb; it is difficult to predict when and what it will do.
The mediastinal pathologies we commonly encounter are as follows:
- Thymoma
- Teratoma
- Bronchogenic cyst
- Pericardial cyst
- Neurogenic tumors
- Lymphoma
- Thyroid goiter
Do reflux and hiatal hernia really affect the lungs?
Our patients are sometimes surprised and ask, “Doctor, why would a problem in my stomach make me cough?” However, Gastroesophageal Reflux Disease (GERD) is one of the most insidious causes of chronic cough. When stomach acid escapes upward into the esophagus, it does not only cause burning in the chest. This acidic vapor or liquid may reach the larynx and then seep into the trachea. We call this “microaspiration.” When the airways come into contact with acid, they suddenly constrict as a protective reflex, and coughing begins.
In some cases, the problem is more mechanical: Hiatal hernia. Part of the stomach takes advantage of looseness in the diaphragm and slides upward into the chest cavity. This condition causes both severe reflux and compression of the lung by occupying space within the chest. In patients who do not improve despite medical treatment, we perform “Nissen Fundoplication” surgery using the laparoscopic, or closed, method. We pull the stomach downward, repair the opening in the diaphragm, and create a new valve by wrapping the upper part of the stomach around the esophagus. When acid leakage stops, the irritation in the airways also ends, and the persistent cough stops abruptly.
Can diaphragm problems cause shortness of breath and coughing?
The diaphragm is the main muscle that separates the chest and abdominal cavities and enables us to breathe. Normally, it opens and closes like a parachute, allowing air to fill the lungs. However, sometimes due to paralysis caused by nerve damage or congenital weakness of the muscle, the diaphragm rises upward, which is called eventration. A dome-shaped diaphragm that has risen upward compresses the lower part of the lung. The compressed lung tissue collapses, resulting in atelectasis, and cannot be ventilated. This collapsed area causes both shortness of breath and constant irritation, resulting in a dry cough.
This is a completely mechanical problem and does not improve with medication. The solution is surgery. With the operation we call “diaphragm plication,” we fold and tighten the relaxed, bag-like diaphragm muscle with sutures, just like altering an oversized garment to make it narrower. When the diaphragm moves downward and becomes taut, the lung above finds space to expand again. When the lung begins to inflate at full capacity, coughing and shortness of breath disappear. Today, we also perform this procedure mostly using closed methods, such as VATS or robotic surgery.
Frequently Asked Questions
Prof. Dr. Alper Fındıkcıoğlu graduated from Istanbul University Faculty of Medicine and completed his thoracic surgery residency at Dr. Siyami Ersek Hospital. He began his academic career at Başkent University in 2005; he received the title of associate professor in 2014 and professor in 2022. He has extensive experience in lung cancer, chest wall diseases, and minimally invasive surgery. Since 2024, he has been continuing his professional work at Acıbadem Hospital.
