Bronchitis is an inflammation of the bronchial tubes, the part of the respiratory
system that leads into the lungs. There are two types of bronchitis — acute
bronchitis and chronic bronchitis. Acute bronchitis usually
appears after a respiratory infection, such as a cold, and can be caused by
either a virus or bacteria. Chronic bronchitis does not have a sudden onset
and is most frequently caused by long term irritation of the bronchial tubes.
A case if bronchitis is considered chronic if symptoms continue for three months
or longer. (Chronic bronchitis is a type of COPD.)
Bronchitis caused by allergies can also be classified as chronic bronchitis.
Asthma is sometimes under diagnosed, especially in children under 5 years
old. Their asthma is sometimes labeled as chronic bronchitis or wheezy bronchitis.
Although not all wheezes and coughs are caused by asthma, asthma should be
considered whenever there is episodic, chronic, or recurrent cough or wheezing
without a clear reason — especially in children.
What are the symptoms of chronic
Symptoms may not be immediately obvious for chronic bronchitis. They include:
- Chronic productive cough (a cough that produces mucus) that increases in
strength and frequency
- Shortness of breath or wheezing, especially during exercise
- Chest pain
What causes chronic bronchitis?
Chronic bronchitis is caused most often by exposure to airborne pollutants
such as cigarette smoke, excessive dust in the air, or chemicals. The constant
exposure to such pollutants begins to cause damage in the bronchioles (the
smaller airways in the lungs), as the bronchial lining becomes inflamed.
Is chronic bronchitis dangerous?
Untreated chronic bronchitis can be very serious. As the bronchitis worsens,
air exchange during breathing becomes less efficient and places strain on the
heart. In addition, people with chronic bronchitis have an increased risk of
developing other illnesses, such as colds or pneumonia. If the bronchitis is
caused by smoking, the bronchitis and breathing problems will get worse as
the smoking continues.
How is chronic bronchitis treated?
The main way to treat chronic bronchitis is to avoid the irritant that is
causing the illness. For allergy-induced bronchitis, this means removing the
allergens from the home or work environment. For smokers, this means quitting
To treat the bronchitis symptoms, increase the humidity in the air to ease
the dry, scratchy throat. Try taking a cough suppressant at night to enable
a good night's sleep. Keep in mind that the use of cough suppressants often
is discouraged during the day to allow the body to cough out the mucus. Allergic
bronchitis may be treated with antihistamine medications to reduce the allergic
Prescription medications may also help. Bronchodilators can help to open the
airways, and steroid drugs can help to reduce the inflammation in the bronchioles.
For severe or very long-term cases, doctors may prescribe oxygen therapy to
allow proper oxygenation throughout the body.
National Asthma Education and Prevention Program Expert Panel Report: guidelines
for the diagnosis and management of asthma update on selected topics -- 2002. J
Allergy Clin Immunol. 2002 Nov;110(Suppl 5):S141-219.
Review Date: 5/16/2007
Reviewed By: Alan Greene, M.D., F.A.A.P., Department of Pediatrics, Packard Children's Hospital, Stanford University School of Medicine; Chief Medical Officer, A.D.A.M., Inc.
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