What is acute bronchitis?
Acute bronchitis is inflammation of the bronchi (the larger airways into the lungs), almost always caused by a virus — the same viruses that cause colds and flu. It typically follows a cold and produces a cough that can persist for 2–3 weeks even after other symptoms resolve.
Most important point: acute bronchitis is overwhelmingly viral. CDC data shows over 70% of patients with acute bronchitis receive antibiotics, but evidence consistently shows antibiotics provide minimal to no benefit and contribute to antibiotic resistance.
Distinguishing simple bronchitis from pneumonia (a more serious lung infection that does need antibiotics) is the main role of medical evaluation.
Do I have acute bronchitis? Common signs
If most of these describe what you're experiencing, telehealth is a reasonable next step:
What causes it
About 90–95% of cases are viral — same viruses as colds and flu (rhinovirus, influenza, coronavirus, RSV, adenovirus). Bacterial bronchitis exists but is rare. Smoking, exposure to dust or fumes, GERD, and asthma all raise the risk.
Is it contagious?
Yes — the underlying virus is contagious through respiratory droplets. You're contagious for the same window as your underlying cold or flu (typically 5–7 days). Bacterial bronchitis (rare) is not particularly contagious.
A cough that lingers after a cold is usually bronchitis — and it almost never needs antibiotics.
Can it be treated online?
Telehealth is well-suited to acute bronchitis evaluation. A clinician reviews your symptoms, timing, fever pattern, breathing, and risk factors. Key job: rule out red flags suggesting pneumonia (high fever, sharp chest pain with breathing, fast breathing, low oxygen) or other concerning processes. If symptoms are classic for viral bronchitis, supportive care and watchful waiting. If concerning, in-person evaluation with chest exam, oxygen monitoring, and sometimes chest X-ray.
How acute bronchitis is treated
Mostly supportive — antibiotics rarely help. Cough suppressants like dextromethorphan for dry cough, expectorants like guaifenesin for productive cough, honey (only over 1 year old) as a natural cough soother, bronchodilators (inhaled albuterol) for patients with wheezing or asthma component. Antivirals like Tamiflu only if flu is the underlying cause. Antibiotics only when bacterial pneumonia or pertussis (whooping cough) is suspected.
Self-care while you wait
- Rest
- Drink lots of fluids — keeps mucus thinner
- Use a humidifier or breathe steam
- Honey and warm liquids soothe cough
- Stop smoking — even temporarily
- Avoid irritants like wood smoke, strong scents
- Sleep with head elevated
- Cough syrup or lozenges at bedtime if cough disrupts sleep
How long does it last?
Most acute bronchitis lasts 2–3 weeks. The cough is often the slowest to resolve — post-viral cough can persist 6–8 weeks after the rest of the infection clears. If you're still coughing significantly at 4 weeks, get evaluated — possible causes include asthma, post-nasal drip, GERD, or pertussis.
Frequently asked questions
Why won't my doctor give me antibiotics?
Because they don't help for viral bronchitis (which is most of it) and cause real harm — side effects, allergic reactions, gut microbiome disruption, antibiotic resistance. A good clinician resists pressure to over-prescribe.
What about colored mucus?
Yellow or green mucus doesn't mean bacterial infection. Both viral and bacterial illnesses produce colored mucus once your immune cells migrate into the airways. Color is a poor antibiotic decision tool.
How is bronchitis different from pneumonia?
Bronchitis is inflammation of the airways. Pneumonia is infection in the lung tissue itself. Pneumonia tends to have higher fever, sharp chest pain with breathing, faster breathing, and may show up on chest X-ray. Pneumonia generally needs antibiotics; bronchitis usually doesn't.
Can a cough be a sign of something serious?
Yes — coughs lasting over 8 weeks ("chronic cough") need workup. Causes include asthma, GERD, post-nasal drip, ACE inhibitors, smoking, and rarely lung cancer or TB. Don't ignore a cough that won't resolve.
Should I get a chest X-ray?
Not for typical acute bronchitis. Chest X-ray is warranted if pneumonia is suspected — significant fever, abnormal vital signs, focal lung findings, or symptoms not improving as expected. Telehealth can guide whether you need imaging.
