Acute bronchitis: symptoms, treatment, and when to see a doctor
Last updated September 6, 2026.
**Acute bronchitis is short term inflammation of the large airways in your lungs, almost always caused by a virus, and its main feature is a cough that outlasts the rest of the cold.** The lining of your bronchial tubes swells and makes extra mucus, so you cough, wheeze a little, and feel sore in the chest when you cough. Treatment is supportive: fluids, rest, honey or a simple cough remedy, and an inhaler only if you are wheezing, because antibiotics do not shorten a viral cough. What changes urgency is your breathing: a cough alone is expected, but shortness of breath, a fever that climbs or returns after you started improving, or chest pain on one side points toward pneumonia and needs an in person exam.
What are the symptoms of Acute bronchitis?
- A cough that often starts dry and later brings up clear, yellow, or green mucus
- Chest soreness or a raw, burning feeling behind the breastbone when you cough
- Mild wheezing or a rattly, congested sound in your chest
- Runny nose, sore throat, or hoarseness in the first few days
- Feeling tired and achy, with a low grade fever or no fever at all
- Cough that lingers for two to three weeks after everything else clears
- Coughing fits that get worse at night or in cold air
A fever over 100.4 F with shaking chills, fast breathing, or sharp pain on one side of the chest points away from simple bronchitis and toward pneumonia.
How does a doctor diagnose Acute bronchitis?
The diagnosis is made from the story and the exam, not from a test. A clinician asks when the cough started, whether it followed a cold, what the mucus looks like, how high your fever has run, and whether you are short of breath walking around or only coughing. On exam they check your temperature, heart rate, breathing rate, and oxygen level, then listen to your lungs: scattered wheezes or coarse sounds that shift when you cough fit bronchitis, while crackles in one spot, dullness, or a low oxygen reading suggest pneumonia. A chest X ray is ordered only when vital signs or the lung exam raise that question, or when you are older, pregnant, or have heart or lung disease. Testing for flu, COVID 19, or whooping cough is added when the season or the pattern fits, since a cough with violent fits, a whoop, or vomiting after coughing changes the treatment. Mucus color is not used to decide anything, because green or yellow sputum is normal in viral bronchitis.
How is Acute bronchitis treated?
- Supportive care: Fluids, rest, and humidified air are the core of treatment. A teaspoon of honey soothes cough in adults and children over 1 year old, and it should never be given to infants under 12 months.
- Antibiotics: They are not recommended for routine acute bronchitis, because the cause is viral in the large majority of cases and antibiotics do not shorten the cough. They are used when a specific bacterial cause is identified or suspected, such as whooping cough treated with azithromycin, or when pneumonia is diagnosed.
- Fever and pain relief: Acetaminophen or ibuprofen at standard over the counter doses eases fever, body aches, and chest soreness. Check other cold products for the same ingredients so you do not double up on acetaminophen.
- Cough and mucus products: Dextromethorphan for a dry cough and guaifenesin for thick mucus give modest relief at best, and neither is required. Over the counter cough and cold medicines should not be given to children under 4 years old.
- Inhalers and trigger control: A short acting bronchodilator such as albuterol helps only if you are wheezing or have asthma or COPD, and it is not useful for cough without wheeze. Stopping smoking and avoiding secondhand smoke and vaping shortens the cough more than any medicine.
When is Acute bronchitis an emergency?
Call 911 for severe trouble breathing, gasping or being unable to finish a sentence, blue or gray lips or fingertips, chest pain with sweating or pain spreading to the arm or jaw, confusion, or fainting. Go to an emergency room the same day for shortness of breath at rest or with light activity, an oxygen reading below 92 percent on a home monitor, coughing up more than streaks of blood, a fever over 103 F, sharp one sided chest pain that worsens when you breathe in, or repeated vomiting that keeps you from drinking. Urgent care or a same day office visit is the right level for a fever over 100.4 F lasting more than three days, a fever that returns after you were getting better, a cough lasting more than three weeks, coughing fits that end in a whoop or vomiting, or any worsening cough when you have asthma, COPD, heart failure, a weakened immune system, or are pregnant. Infants under 3 months with any fever and anyone with noisy fast breathing or ribs pulling in with each breath should be seen right away.
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Common questions
How long does the cough from acute bronchitis last?
The cough usually lasts two to three weeks, and it commonly outlives the runny nose and sore throat by a wide margin. That is because the airway lining stays inflamed and twitchy after the virus is gone, so cold air, laughing, or talking can set off a fit. Most people feel steadily better week over week even while still coughing. A cough that goes past three weeks, or one that is getting worse rather than better, should be checked in person.
Why will not my doctor give me antibiotics?
Acute bronchitis is caused by a virus in the large majority of cases, and antibiotics do nothing to viruses. Studies of antibiotics for bronchitis show little to no meaningful shortening of the cough, while side effects such as diarrhea, yeast infections, rash, and allergic reactions are common. Unnecessary courses also make the bacteria you carry harder to treat later. Antibiotics are the right call when pneumonia is diagnosed or when whooping cough is suspected, and a clinician looks for both before deciding.
Does green or yellow mucus mean I have a bacterial infection?
No. Mucus turns yellow or green when white blood cells arrive and release enzymes, and that happens in ordinary viral infections. Color does not distinguish viral from bacterial illness and is not used to decide about antibiotics. What matters is your fever curve, your breathing, your oxygen level, and what your lungs sound like.
How is bronchitis different from pneumonia?
Bronchitis is inflammation of the airways, while pneumonia is infection in the air sacs of the lung itself. Bronchitis tends to bring a cough with mild or no fever, wheezing, and normal breathing at rest. Pneumonia more often brings a fever over 100.4 F with chills, faster breathing, shortness of breath doing ordinary things, and sometimes sharp pain on one side when you breathe in. On exam, pneumonia often produces crackles in one area of the lung and a lower oxygen reading, and a chest X ray confirms it.
What actually helps the cough at night?
Honey by the spoonful before bed works about as well as over the counter cough syrups in adults and children over 1 year, and it is cheap and safe. Warm fluids, a cool mist humidifier, and propping your head up with an extra pillow all reduce coughing fits. Dextromethorphan can take the edge off a dry cough, and guaifenesin with plenty of water can loosen thick mucus. Do not give over the counter cough and cold medicines to children under 4 years old, and do not give honey to babies under 12 months.
Am I contagious, and when can I go back to work?
The viruses that cause bronchitis, including cold viruses, flu, RSV, and COVID 19, spread through droplets and contaminated hands, and you are most contagious in the first few days when you have fever and nasal symptoms. A general rule is to stay home until you have been fever free for 24 hours without fever reducing medicine and your symptoms are improving overall. A lingering dry cough by itself does not mean you are still spreading virus. Wash your hands often, cover coughs, and stay away from newborns, older adults, and anyone with a weakened immune system while you are in the early symptomatic stretch.
Should I use my rescue inhaler for bronchitis?
Use it if you are wheezing or feel chest tightness, and especially if you have asthma or COPD, since bronchitis is a common trigger for a flare in both. Albuterol opens narrowed airways, so it helps that specific problem. For a plain cough without wheeze, inhalers have not been shown to help and can cause jitteriness and a fast heartbeat. If you are needing your rescue inhaler more often than usual or it is not lasting four hours, that is a reason for a same-day visit.
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