Causes
- Viruses: The same viruses that cause colds and flu account for the vast majority of cases. Because the cause is viral, antibiotics usually do not help.
- Bacteria: A small minority of cases, including infections such as whooping cough (pertussis).
- Irritants: Smoke, dust, fumes, and air pollution can inflame the airways and worsen symptoms.
Symptoms
- Cough: The main symptom, dry at first and often becoming productive of clear, yellow, or green mucus. Colored mucus alone does not mean a bacterial infection.
- Chest discomfort: Soreness or a burning feeling behind the breastbone, often worse with coughing.
- Wheezing and mild shortness of breath: The inflamed airways can temporarily narrow, mimicking mild asthma.
- Mild fever, fatigue, and sore throat: Usually in the first few days; high or prolonged fever suggests something else, such as pneumonia or influenza.
Diagnosis
Acute bronchitis is diagnosed by history and physical examination. Testing is usually unnecessary, but your doctor may order a chest X-ray when fever is high, oxygen levels are low, breathing is labored, or the exam suggests pneumonia — particularly in older adults and smokers. A cough lasting beyond three weeks may prompt evaluation for other causes such as postnasal drip, reflux, or underlying lung disease like COPD.Treatment
Treatment focuses on comfort while the airways heal:- Supportive care: Rest, plenty of fluids, honey for cough (in adults and children over age one), throat lozenges, and a humidifier.
- Symptom relievers: Acetaminophen or ibuprofen for fever and chest soreness; over-the-counter cough medicines offer modest benefit for some people.
- Inhaled bronchodilators: When wheezing is present, an albuterol inhaler can relieve airway tightness and cough.
- Antibiotics: Generally not recommended, because they do not shorten a viral illness and can cause side effects; they are reserved for specific situations such as suspected pertussis.
- Avoiding smoke: Not smoking, and avoiding secondhand smoke, speeds recovery and prevents repeated episodes.
Bronchitis vs. Pneumonia
The two are easy to confuse because both cause cough after a cold. Bronchitis inflames the airways; pneumonia infects the lung tissue itself and is more dangerous. Clues that point toward pneumonia include high or persistent fever, shaking chills, breathlessness at rest, a fast heart rate, chest pain with breathing, and feeling significantly ill rather than merely worn down. When the picture is unclear, a simple office exam and, if needed, a chest X-ray settle the question.When to Seek Care
See a doctor promptly for a fever above 100.4°F lasting more than a few days, shortness of breath at rest, coughing up blood, symptoms that worsen after initially improving, or a cough lasting longer than three weeks. Repeated bouts of bronchitis in a smoker can be an early sign of chronic lung disease, and sinus infections such as sinusitis can cause a similar lingering cough. Most bronchitis clears on its own, but it is worth confirming that nothing more serious is brewing. The primary-care team at Zimmer Medical Group offers same-week sick visits to sort out a stubborn cough — schedule an appointment if you are not improving.What Recovery Actually Looks Like
Acute bronchitis is inflammation of the large airways, and in otherwise healthy adults it is viral in the overwhelming majority of cases. It is also the single most common reason antibiotics are prescribed inappropriately in outpatient practice, which makes understanding its natural course genuinely useful.
The cough lasts longer than anyone expects
The median duration of cough in acute bronchitis is around three weeks, and a substantial proportion of people are still coughing at four. Patients typically expect it to last a week, so at day ten they conclude something is wrong and seek antibiotics. Knowing the real timeline in advance prevents a great deal of unnecessary treatment and unnecessary worry.
Why antibiotics do not help
Trials consistently show that antibiotics shorten symptoms by less than a day in acute bronchitis while causing diarrhoea, rash, and occasionally C. difficile infection. Coloured sputum does not indicate bacterial infection — it reflects inflammatory cells and is entirely normal in viral illness. This is one of the more firmly established findings in primary care and one of the most consistently ignored.
What actually helps symptoms
Honey has better evidence than most over-the-counter cough preparations. Adequate fluids, humidified air, and rest help. For people with underlying airway disease, a bronchodilator may relieve wheeze. Cough suppressants provide modest benefit and are reasonable for sleep. Smoking cessation matters more than any of these — continued smoking prolongs the illness substantially.
When it is not simple bronchitis
Fever above 38 degrees, breathlessness at rest, chest pain, a heart rate above 100, or focal findings on examination raise the possibility of pneumonia and warrant assessment. Cough persisting beyond eight weeks becomes chronic cough and needs a different workup. Recurrent episodes in a smoker may be the first sign of COPD. Our pulmonary team handles cough that is not resolving. The CDC guidance on bronchitis and the American Lung Association set out what treatment is and is not warranted.
Post-viral cough and airway sensitivity
The cough that persists after the infection has cleared reflects temporarily hypersensitive airways rather than continuing infection. Cold air, exercise, strong smells, and even talking can trigger it. In people with a history of asthma or allergy this can last longer and occasionally responds to a short course of inhaled treatment, which is worth discussing if the cough is disrupting sleep.
If you are breathless, feverish, or the cough has passed eight weeks, schedule a visit rather than waiting it out further.