Tracheobronchitis is inflammation of both the trachea (windpipe) and the bronchi, the large airways that branch into each lung. In most cases it’s caused by a viral infection, lasts one to three weeks, and resolves on its own. You’ll sometimes see it called a “chest cold,” and it overlaps heavily with what people know as acute bronchitis. The key distinction is that the inflammation extends upward into the trachea rather than being limited to the bronchial tubes alone.
Where the Inflammation Happens
Your trachea is the single tube that runs from the back of your throat down into your chest, where it splits into two main bronchi, one for each lung. Those bronchi keep dividing into smaller and smaller branches. In tracheobronchitis, the inflammation reaches from the trachea down through the large and medium-sized airways, sometimes as far as the third level of branching. The lining of these airways thickens, becomes irritated, and often produces extra mucus.
The inflammation doesn’t follow a neat, continuous path. Studies of rhinovirus infections have found patchy islands of inflamed tissue scattered along the trachea, which helps explain why symptoms can feel inconsistent, worse one hour and better the next. This is different from bronchiolitis, which targets the much smaller airways deep in the lungs, and from pneumonia, which involves the air sacs themselves.
What Causes It
Viruses are responsible for the vast majority of cases. The most common culprits are the same ones behind ordinary colds: rhinovirus and coronavirus. More aggressive viruses like influenza, adenovirus, respiratory syncytial virus (RSV), and parainfluenza can also trigger it, and these tend to produce more severe symptoms.
A small fraction of cases are caused by bacteria. The ones most clearly linked to airway infections of this type are Mycoplasma pneumoniae, Bordetella pertussis (the whooping cough bacterium), and Chlamydia pneumoniae. Other bacteria sometimes found in the airways, like Streptococcus pneumoniae and Haemophilus influenzae, can live in the upper respiratory tract of healthy people, so their role in causing tracheobronchitis specifically is less clear.
Chronic forms of the condition aren’t driven by infection at all. Long-term exposure to inhaled irritants is the usual cause. In the United States, cigarette smoke is the primary driver. Pipe and cigar smoke, secondhand smoke, air pollution, and chemical fumes or dust from workplace environments all contribute as well.
Symptoms and How Long They Last
Cough is the hallmark symptom. It may be dry or produce mucus, and it can linger for up to three weeks even as you otherwise feel better. Many people notice the cough worsens at night or first thing in the morning. Because the trachea is involved, you may also feel a raw, burning sensation behind the breastbone that standard bronchitis doesn’t always produce.
Other common symptoms include mild wheezing, shortness of breath, sore throat, low-grade fever, and general fatigue. Mucus color varies and can be clear, white, yellow, or even green. A widespread misconception is that colored mucus means a bacterial infection, but that’s not the case. Colored sputum simply reflects the activity of your immune cells and doesn’t change whether antibiotics are needed.
Coughing up blood-streaked mucus can happen occasionally with acute bronchitis and tracheitis due to irritation of the airway lining. Small streaks are usually not dangerous, but significant or persistent bloody mucus warrants medical attention.
How It’s Diagnosed
Tracheobronchitis is largely a clinical diagnosis, meaning your doctor identifies it based on your symptoms and a physical exam rather than lab tests. Viral cultures, blood tests, and sputum analysis aren’t routinely performed because the specific virus or bacterium responsible is rarely identified in everyday clinical practice, and identifying it wouldn’t change the treatment.
The more important diagnostic task is ruling out pneumonia, which does require different treatment. Doctors use a straightforward set of criteria: if your heart rate is under 100 beats per minute, your breathing rate is under 24 breaths per minute, your temperature is below 38°C (100.4°F), and your lung exam doesn’t reveal focal consolidation or other specific abnormalities, the chance of pneumonia is low enough that a chest X-ray typically isn’t needed. If any of those signs are present, imaging helps confirm or rule out pneumonia.
Treatment and Recovery
Because the condition is almost always viral, antibiotics are not recommended for uncomplicated tracheobronchitis, regardless of how long the cough lasts. This is a consistent guideline from the CDC and major medical organizations. Antibiotics won’t shorten a viral illness, and unnecessary use contributes to antibiotic resistance.
Treatment focuses on managing symptoms while your body clears the infection. Over-the-counter cough suppressants, first-generation antihistamines, and decongestants can provide some relief, though the evidence supporting any specific option is limited. None of these shorten the illness itself. Staying hydrated, resting, and using a humidifier may help ease airway irritation. Most people recover fully within one to three weeks, though a lingering dry cough can persist a bit longer in some cases.
Possible Complications
The most significant complication is pneumonia, which can develop when infection spreads from the large airways into the lung tissue. This is uncommon in otherwise healthy adults but is a greater risk for older adults, young children, smokers, and people with weakened immune systems. Worsening fever, increasing shortness of breath, or a sudden decline after you’d started feeling better are signs the infection may have progressed.
Repeated bouts of acute tracheobronchitis, especially in someone who smokes or is regularly exposed to irritants, can eventually lead to chronic bronchitis. Chronic bronchitis is defined by a productive cough lasting at least three months in two consecutive years and falls under the broader category of chronic obstructive pulmonary disease (COPD).
Tracheobronchitis in Children
In young children, typically between six months and three years old, inflammation that extends from the voice box down through the trachea and bronchi is known as croup, or acute laryngotracheobronchitis. It produces a distinctive barking cough that sounds like a seal, along with hoarseness and a harsh, high-pitched breathing sound called stridor that’s most noticeable when the child breathes in.
Croup usually starts with a day or two of runny nose, mild cough, and sometimes low fever before the characteristic barking cough appears, often suddenly at night. In milder cases, symptoms improve during the day and return at night. The breathing rate may be slightly elevated but usually stays below 50 breaths per minute, unlike bronchiolitis, which tends to cause more rapid breathing.
Most cases of croup are mild and viral, but bacterial tracheitis in children is a medical emergency. It comes on rapidly with high fever, stridor, difficulty breathing, and large amounts of thick, pus-like mucus. Children with bacterial tracheitis look visibly sick, don’t respond to standard croup treatments, and need immediate hospital care. The absence of the typical barking cough and the presence of drooling and a toxic appearance help distinguish this from ordinary viral croup.
The Veterinary Connection
If you’ve heard the term “infectious tracheobronchitis” in the context of dogs, that’s kennel cough. It’s the same type of airway inflammation, caused by a mix of viruses and the bacterium Bordetella bronchiseptica, and it spreads easily in places where dogs are housed together. The condition in dogs is not transmissible to humans, but the terminology is identical because the anatomy involved is the same.