The Facts

Chronic bronchitis belongs to a larger family of medical conditions known as chronic obstructive pulmonary disease (COPD). The term COPD is given to any condition that causes difficulty in breathing as a result of constant blocking of the airways.

Bronchitis is identified by a cough, usually with some sputum production.The cough happens because the air tubes are permanently inflamed and secrete mucus. When cough and sputum have been present for more than 3 months in each of 2 consecutive years, the condition is called chronic bronchitis. In North America, about 1 person in 20 suffers from chronic bronchitis.

Smoking for many years causes about 90% of chronic bronchitis cases, and the great majority of people with chronic bronchitis are over 45 years of age. The risk of chronic bronchitis is also increased in workers employed in certain occupations such as coal mining, welding, asbestos work, or grain handling.

When breathing becomes more difficult for a person with chronic bronchitis, they may be experiencing an acute exacerbation of chronic bronchitis (AECB). During an acute exacerbation, breathing becomes more difficult because of further narrowing of the airways and secretion of large amounts of mucus that is often thicker than usual.

Health Tool

COPD Myths

Do you know the top myths around COPD?


The further narrowing of airways in people with chronic bronchitis that results in AECB can be caused by allergens (e.g., pollens, wood or cigarette smoke, pollution), toxins (a variety of different chemicals), or acute viral or bacterial infections.

Bacterial infections are usually associated with mucus that turns a yellow or greenish colour and is typically much thicker than usual. Coloured mucus does not necessarily mean the person has a bacterial infection, however.

When a person has severe chronic lung disease from smoking, it may take something as minor as a chest cold to make their breathing so severe that they must be hospitalized.

Health Tool

How is COPD affecting your life?

Find out the current impact of your COPD so you can take steps to feel better and healthier every day.

Symptoms and Complications

AECB is associated with increased frequency and severity of coughing, and it is often accompanied by worsened chest congestion and discomfort. Increasing shortness of breath is also typical, and wheezing may be present as well.

People suffering from an acute exacerbation caused by infection may feel weak and have fever and chills. Doctors may recommend a chest X-ray to ensure that pneumonia is not the cause for these symptoms. Blood in the sputum may also indicate other medical conditions and should be reported to your physician promptly.

Health Tool

Do you have breathing troubles?

Short of breath? Coughing? Take a short quiz to find out if you have COPD.

Making the Diagnosis

An acute exacerbation of chronic bronchitis (AECB) is said to have occurred if there has been an increase in frequency and severity of cough, along with larger amounts of sputum, or increasing shortness of breath.

The challenge lies in diagnosing the cause of an AECB so that the best treatment can be put in place. Therefore, it is important for the person with AECB to give their doctor a detailed description of the circumstances that may have led to the particular episode. For example, was there exposure to inhaled irritants such as secondhand smoke in the recent past? It is also important to describe any symptoms experienced to the doctor (e.g., fever, chills).

Your physician may investigate your AECB with a chest X-ray or a sputum culture. Treatment is often started before the test results confirm the condition.

Health Tool

COPD Doctor Discussion Guide

How to speak with your doctor to get the best care

Treatment and Prevention

Prevention of AECB for a person with chronic bronchitis includes:

  • quitting smoking and avoiding dust, second-hand smoke, and other inhaled irritants
  • immunization against influenza (yearly) and pneumonia (single injection, or several as recommended by your doctor)
  • regular exercise, appropriate rest, and healthy nutrition as discussed with health professionals
  • avoiding people who currently have an infectious respiratory disease such as a cold or influenza
  • maintaining good fluid intake and humidifying the home to help reduce the problem of thick sputum and chest congestion

Treatment of AECB may include:

  • cough suppressants: These may be used to reduce the severe coughing that can occur with AECB. Expectorants may be used to help liquefy thick mucus, making it easier to clear it from the airways. Drinking plenty of fluids will also help to thin mucus.
  • inhaled bronchodilators: Treatment with bronchodilators such as salbutamol, ipratropium, and terbutaline* open up the airways in the lungs.
  • antibiotics: This treatment is used if a bacterial infection is the suspected cause. Antibiotics will not help infections caused by viruses. Viral infections will usually go away on their own with the aid of proper rest and care. However, other medications may be needed to control symptoms.
  • corticosteroids: These medications, such as oral (taken by mouth) prednisone or inhaled fluticasone, reduce inflammation in the airways. Oral corticosteroids are usually used for short periods of time when an acute exacerbation occurs, while inhaled forms may be continued for longer.
  • theophylline: This is an oral medication that may help to ease the difficulty of breathing, though it is now less often prescribed. If a person with AECB is not already taking theophylline for chronic bronchitis, the doctor may want them to take it to help with the symptoms of an acute exacerbation.
  • oxygen therapy: A physician will recommend this if your blood oxygen level is too low. Some people with severe chronic bronchitis require oxygen on an ongoing basis. Portable "home oxygen therapy" allows a person to remain mobile while receiving this therapy.

Any person with chronic bronchitis should have a treatment or "care plan" in place for those times when an acute exacerbation suddenly hits. A doctor and patient must agree on which symptoms to watch for (e.g., shortness of breath, change in character or amount of mucus) before the person starts self-treatment. Such plans allow a person to start treatment right away so symptoms are kept as much under control as possible until a doctor can be seen.


*All medications have both common (generic) and brand names. The brand name is what a specific manufacturer calls the product (e.g., Tylenol®). The common name is the medical name for the medication (e.g., acetaminophen). A medication may have many brand names, but only one common name. This article lists medications by their common names. For information on a given medication, check our Drug Information database. For more information on brand names, speak with your doctor or pharmacist.