Bronchitis: Symptoms, Causes, and Treatment
Updated: 3 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick answer
Bronchitis is inflammation of the lining of the bronchial tubes, causing a cough that often brings up thickened mucus, plus chest discomfort and fatigue. Most cases improve on their own within a couple of weeks with rest and fluids. See a doctor if you cough up blood, have a fever above 100.4 F (38 C) or worsening shortness of breath. [1] [2]
What the research says
According to PubMed:
Antibiotics offer little benefit for acute bronchitis. A Cochrane review of 17 trials with 5,099 participants found no difference in the number of people clinically improved with antibiotics versus placebo (RR 1.07, 95% CI 0.99 to 1.15), a mean cough duration only 0.46 days shorter, and more side effects with antibiotics (RR 1.20, about 1 extra person with a side effect for every 24 treated). (Smith et al., DOI).
A cough usually lasts longer than people expect. A systematic review found the mean duration of cough in otherwise healthy adults was 17.8 days, while 493 adults surveyed expected a mean of about 7 to 9 days. (Ebell et al., DOI).
Herbal cough remedies show little benefit. An updated systematic review of ivy leaf extract (6 randomized trials, 1 controlled trial, and 4 observational studies) found it safe, but effects were minimal at best and of uncertain clinical importance. (Sierocinski et al., DOI).
Study details are from PubMed abstracts.
Key facts at a glance
Key fact | What to know |
What it is | Inflammation of the lining of the bronchial tubes, the airways to the lungs [1] |
Who gets it | Very common; acute bronchitis often follows a cold or other respiratory infection [1] |
Main cause | Viruses that cause colds and flu for acute cases; smoking for chronic cases [1] |
Usual course | Acute: improves in a week to 10 days; chronic: requires medical attention [1] |
Antibiotics |
What is bronchitis?
Bronchitis is an inflammation of the lining of your bronchial tubes, the passages that carry air to and from your lungs. People who have bronchitis often cough up thickened mucus, which can be discolored. [1]
The condition comes in two forms. Acute bronchitis starts suddenly and is short term. Chronic bronchitis starts gradually and becomes long term. [1]
Acute bronchitis often develops from a cold or other respiratory infection and is very common. Also called a chest cold, it usually improves within a week to 10 days without lasting effects, although the cough may linger for weeks. [1]
Chronic bronchitis is a constant irritation or inflammation of the lining of the bronchial tubes, often due to smoking. If you have repeated bouts of bronchitis, you may have chronic bronchitis, which requires medical attention. Chronic bronchitis is one of the conditions included in chronic obstructive pulmonary disease, or COPD. [1] [4]
What are the symptoms of bronchitis?
If you have acute bronchitis, you may have cold symptoms that build over the first few days. [1]
Early signs
Coughing, production of thickened mucus, and chest discomfort appear first, sometimes with a light fever. Within about a week, most people start to feel better, although a nagging cough often outlasts everything else. [1]
What acute bronchitis looks like
You may experience any combination of the following, and symptoms can vary from person to person. [1]
Symptom | What it looks like |
Cough | Nearly always present, often the main complaint [1] |
Mucus (sputum) | Can be clear, white, yellowish-gray, or green; rarely streaked with blood [1] |
Sore throat | Common in the early days [1] |
Mild headache and body aches | Similar to cold or flu aches [1] |
Slight fever and chills | Low-grade fever may appear early [1] |
Fatigue | Can persist over a week or more [1] |
Chest discomfort | A feeling of tightness or soreness when coughing [1] |
Shortness of breath and wheezing | A high-pitched whistling sound may occur when breathing out [1] |
While these symptoms usually improve in about a week, you may have a nagging cough that lingers for several weeks. [1]
What chronic bronchitis looks like
For chronic bronchitis, signs and symptoms may include a cough, mucus production, fatigue, chest discomfort, and shortness of breath. [1]
Chronic bronchitis is typically defined as a productive cough that lasts at least three months, with bouts that recur for at least two consecutive years. If you have chronic bronchitis, you are likely to have periods when your cough or other symptoms worsen. It is also possible to have an acute infection on top of chronic bronchitis. [1] [4]
When should you see a doctor about bronchitis?
Contact your doctor or clinic for advice if your cough is accompanied by a fever higher than 100.4 F (38 C), produces blood, is associated with serious or worsening shortness of breath or wheezing, or lasts more than three weeks. [1]
Call 911 or get emergency care right away if you appear pale and lethargic, have a bluish tinge to your lips and nail beds, or have trouble thinking clearly or concentrating. [1]
Warning sign | Why it matters |
Fever above 100.4 F (38 C) | A higher fever can signal a more serious infection [1] |
Cough produces blood | Blood in mucus needs evaluation [1] |
Serious or worsening shortness of breath or wheezing | Breathing is getting harder and needs prompt evaluation [1] |
Pale, lethargic, bluish lips or nail beds, or trouble thinking clearly | These can signal low oxygen levels and need urgent attention [1] |
Cough lasting more than three weeks |
Before you go in, your doctor or clinic can give you guidance on how to prepare for your appointment. [1]
What causes bronchitis and how does it happen?
Acute bronchitis is usually caused by viruses, typically the same viruses that cause colds and flu (influenza). Many different viruses, all of which are very contagious, can cause acute bronchitis. [1]
Antibiotics do not kill viruses, so this type of medication is not useful in most cases of bronchitis. [1] [3]
Viruses spread mainly from person to person by droplets produced when an ill person coughs, sneezes, or talks and you inhale the droplets. Viruses may also spread through contact with an infected object, when you touch something with the virus on it and then touch your mouth, eyes, or nose. [1]
The most common cause of chronic bronchitis is cigarette smoking. Air pollution and dust or toxic gases in the environment or workplace also can contribute to the condition. [1]
What are the risk factors for bronchitis?
Factors that increase your risk of bronchitis include the following. [1]
Risk factor | Why it matters |
Cigarette smoke | Smokers and people who live with smokers face higher risk of both acute and chronic bronchitis [1] |
Low resistance | Another acute illness or a chronic immune-compromising condition raises risk; older adults, infants, and young children are more vulnerable [1] |
Job irritants | Working around grains, textiles, or chemical fumes increases the odds [1] |
Gastric reflux | Repeated severe heartburn irritates the throat and raises bronchitis odds [1] |
What complications of bronchitis should you watch for?
Although a single episode of bronchitis usually is not a cause for concern, it can lead to pneumonia in some people. [1]
Repeated bouts of bronchitis, however, may mean that you have chronic obstructive pulmonary disease (COPD). [1]
How is bronchitis diagnosed?
During the first few days of illness, it can be difficult to distinguish the signs and symptoms of acute bronchitis from those of a common cold. [2]
A healthcare provider can usually diagnose bronchitis by listening to your lungs with a stethoscope during a physical exam. If symptoms are getting worse, or if there may be another problem, additional tests may be ordered. [2]
Diagnostic step | What it shows |
Stethoscope exam | Listening closely to the lungs as you breathe confirms the diagnosis in most cases [2] |
Chest X-ray | Can show whether pneumonia or another condition explains the cough; especially important if you smoke or have ever smoked [2] |
Sputum tests | The mucus you cough up can be tested for illnesses that antibiotics could help with, and for signs of allergies [2] |
Pulmonary function test | Blowing into a spirometer measures how much air your lungs hold and how quickly air comes out; checks for asthma, chronic bronchitis, or emphysema [2] |
What are the treatment options for bronchitis?
Most cases of acute bronchitis get better without treatment, usually within a couple of weeks. [2]
Medications
In some circumstances, your doctor may recommend medications. [2]
Cough medicine. If your cough keeps you from sleeping, you might try cough suppressants at bedtime. [2]
Other medications. If you have allergies, asthma, or COPD, your doctor may recommend an inhaler and other medications to reduce inflammation and open narrowed passages in your lungs. [2]
Antibiotics. Because most cases of acute bronchitis are caused by viral infections, antibiotics are not effective. However, if your doctor suspects a bacterial infection, an antibiotic may be prescribed. [2] [3]
Therapies
If you have chronic bronchitis, you may benefit from the following therapies. [2]
Pulmonary rehabilitation. This is a breathing exercise program in which a respiratory therapist teaches you how to breathe more easily and increase your ability to be physically active. [2]
Oxygen therapy. This delivers extra oxygen to help you breathe. [2]
Care at home
Though it may not be possible to shorten the length of the illness, you can make yourself more comfortable with a few simple steps. [2]
Home measure | How to do it |
Get enough rest | Rest and sleep help your body heal [2] |
Drink plenty of fluids | Staying hydrated thins mucus, making it easier to clear [2] |
Avoid lung irritants | Do not smoke, and wear a mask in polluted air or around strong fumes from paint or household cleaners [2] |
Use a humidifier | Warm, moist air relieves coughs and loosens mucus; clean the humidifier per the manufacturer's guidance to avoid bacteria and fungus growth [2] |
Cover up in cold air | If cold air worsens your cough or breathing, cover your mouth and nose with a face mask or scarf before going outside [2] |
How can you prevent bronchitis?
To reduce your risk of bronchitis, follow these tips. [1]
Get an annual flu shot. Many cases of acute bronchitis result from influenza, a virus. Getting a yearly flu vaccine can help protect you from getting the flu. Also ask your doctor or clinic if you need a vaccination that protects against certain types of pneumonia. [1]
Wash your hands. Wash your hands frequently and get in the habit of using alcohol-based hand sanitizers. Avoid touching your eyes, nose, and mouth. [1]
Avoid close contact with people who have a viral infection. Stay away from people who have the flu or another respiratory illness. [1]
Avoid cigarette smoke. Cigarette smoke increases your risk of chronic bronchitis. [1]
Wear appropriate face covering. If you have COPD, consider wearing a face mask at work if you are exposed to dust or fumes. Talk to your employer about the appropriate protection. Wearing a face mask when you are going to be among crowds helps reduce exposure to infections. [1]
How should you prepare for a bronchitis appointment?
You will likely start by seeing your family doctor. If you have chronic bronchitis, you may be referred to a doctor who specializes in lung diseases (pulmonologist). [2]
Before your appointment, make a list of answers to the following questions. [2]
Have you recently had a cold or the flu?
Have you ever had pneumonia?
Do you have any other medical conditions?
What medications, vitamins, and supplements do you take regularly?
Are you exposed to lung irritants at your job?
Do you smoke or are you around tobacco smoke?
If possible, bring a family member or friend to your appointment. Sometimes it is difficult to remember all the information provided. Someone who accompanies you may remember something that you missed or forgot. [2]
If you have ever seen another physician for your cough, tell your present doctor what tests were done. If possible, bring the reports with you, including results of a chest X-ray, sputum culture, and pulmonary function test. [2]
Expect the provider to ask when symptoms began, whether they are continuous or occasional, whether they affect your sleep or work, and what seems to make them better or worse. Preparing for these questions helps you make the most of your time. [2]
Conclusion
Bronchitis is one of the most common respiratory illnesses, and most people with acute bronchitis recover at home within a week to 10 days, although the cough may linger for weeks. [1] [2]
The key is knowing when a cough is more than a chest cold. Blood in your mucus, a fever above 100.4 F, serious or worsening shortness of breath or wheezing, a bluish tinge to your lips or nail beds, or a cough that lasts more than three weeks are all reasons to contact a doctor. [1]
If you keep getting bouts of bronchitis, ask about chronic bronchitis and COPD, and avoid cigarette smoke and other lung irritants. Rest, fluids, and a humidifier can ease the cough while your body recovers. [1] [2]
Next steps: Worried about your breathing or a cough that will not go away? See a healthcare professional, especially if you cough up blood, have a fever above 100.4 F, or your shortness of breath or wheezing is getting worse.
Frequently asked questions
How do I know if my bronchitis is acute or chronic?
Acute bronchitis starts like a cold and improves in about a week to 10 days, though the cough can linger for weeks. Chronic bronchitis means a productive cough lasting at least three months with bouts recurring for at least two years, usually from smoking, and needs medical attention. [1]
How long does bronchitis last?
Acute bronchitis usually improves within a week to 10 days without lasting effects, although a nagging cough may linger for several weeks. Most cases get better without treatment within a couple of weeks. [1] [2]
Do antibiotics help bronchitis?
No. Most acute bronchitis is caused by viruses, so antibiotics, which treat bacterial infections, do not work. An antibiotic may be given only if your doctor suspects a bacterial infection along with the illness. [1] [2] [3]
When should I go to the hospital?
Contact your doctor or clinic for a fever above 100.4 F (38 C), blood in your cough, serious or worsening shortness of breath or wheezing, or a cough that lasts more than three weeks. Seek prompt medical attention if you appear pale and lethargic, have a bluish tinge to your lips and nail beds, or have trouble thinking clearly. [1]
Can bronchitis turn into pneumonia?
Yes. Although a single episode usually is not a cause for concern, acute bronchitis can lead to pneumonia in some people, and repeated bouts may mean you have COPD. [1]
This article is for general education and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional about your individual situation.
Is bronchitis contagious?
Acute bronchitis is usually caused by cold and flu viruses, which can spread to others. Chronic bronchitis, which is often caused by smoking, is not contagious. Washing your hands and covering coughs helps protect others.
How can I ease a bronchitis cough at home?
Rest, drink plenty of fluids, use a humidifier and avoid smoke and fumes. Honey can soothe a cough in adults and children over 1 year old, but never give honey to a baby under 1.
Why does my cough last so long after bronchitis?
The airways can stay irritated after the infection clears, so a cough may linger for several weeks. See a doctor if your cough lasts more than three weeks.
Does green or yellow mucus mean I need antibiotics?
No. Mucus can be clear, white, yellow or green with viral bronchitis, and color alone does not mean you have a bacterial infection. Your provider will decide if antibiotics are needed.
Can smoking cause bronchitis?
Yes. Cigarette smoking is the most common cause of chronic bronchitis, and smokers and people who live with smokers have a higher risk of both types. Quitting is one of the best ways to protect your lungs.
Related Reading
Chronic Bronchitis: Symptoms, Causes, Treatment and Outlook explains the long-term form of bronchitis, its causes and outlook.
Pneumonia: Complete Guide to Symptoms, Causes, and Treatment covers the lung infection that bronchitis can sometimes lead to.
Chronic Cough: Causes, Symptoms, Diagnosis, and Treatment (2026 Guide) explains why a cough lasts for weeks and how doctors find the cause.
What Is Chronic Obstructive Pulmonary Disease (COPD)? Symptoms, Causes, Stages, and Treatment explains the lung disease that includes chronic bronchitis and how it is treated.
References
Mayo Clinic Staff. Bronchitis - Symptoms and causes. Mayo Clinic. July 31, 2024. https://www.mayoclinic.org/diseases-conditions/bronchitis/symptoms-causes/syc-20355566
Mayo Clinic Staff. Bronchitis - Diagnosis and treatment. Mayo Clinic. July 31, 2024. https://www.mayoclinic.org/diseases-conditions/bronchitis/diagnosis-treatment/drc-20355572
Centers for Disease Control and Prevention. Chest cold (acute bronchitis) basics. CDC. July 2, 2025. https://www.cdc.gov/acute-bronchitis/about/index.html
National Heart, Lung, and Blood Institute. Bronchitis. NHLBI, NIH. December 2, 2022. https://www.nhlbi.nih.gov/health/bronchitis
Smith SM, Fahey T, Smucny J, et al. Antibiotics for acute bronchitis. Cochrane Database Syst Rev. 2017;6(6):CD000245. PMID 28626858. https://doi.org/10.1002/14651858.CD000245.pub4
Ebell MH, Lundgren J, Youngpairoj S. How long does a cough last? Comparing patients' expectations with data from a systematic review of the literature. Ann Fam Med. 2013;11(1):5-13. PMID 23319500. https://doi.org/10.1370/afm.1430
Sierocinski E, Holzinger F, Chenot JF. Ivy leaf (Hedera helix) for acute upper respiratory tract infections: an updated systematic review. Eur J Clin Pharmacol. 2021;77(8):1113-1122. PMID 33523253. https://doi.org/10.1007/s00228-021-03090-4
Medical disclaimer
The information provided in this article is for educational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
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