Bronchitis - Experience

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What is chronic bronchitis?

Chronic bronchitis is defined as a cough that occurs every day with sputum production that lasts for at least 3 months, two years in a row. This definition was developed to help select uniform patient populations for research purposes, for example, to study medication therapies for treatment of chronic bronchitis.

Many of the bronchi develop chronic inflammation with swelling and excess mucus production. The inflammation causes a change in the lining cells of the airways to varying degrees. Many cells that line the airway lose the function of their cilia (hair-like appendages that are capable of beating rapidly), and eventually the ciliated cells are lost. Cilia perform the function of moving particles and fluid (usually mucus) over the lining surface in such structures as the trachea, bronchial tubes, and nasal cavities to keep these hollow structures clear of particles and fluids. These ciliated cells that help in clearance of secretions are often replaced by so-called goblet cells. This group of cells secretes mucus into the airway. The warm moist environment of the airway along with the nutrients in the mucus is an excellent medium for growing bacteria. The mucus often becomes infected and discolored from the bacterial overgrowth and the body's inflammatory response to it. The inflammation, swelling, and mucus frequently and significantly inhibit the airflow to and from the lung alveoli by narrowing and partially obstructing the bronchi and bronchioles.

The muscles that surround the some of the airways can be stimulated by this airway irritation. This muscular spasm also known as bronchospasm can result in further airway narrowing. With long standing inflammation, as can be seen in chronic bronchitis, this muscular spasm and inflammation results in a fixed, nonreversible narrowing of the airway and the condition is termed chronic obstructive pulmonary disease (COPD). Chronic coughing develops as the body attempts to open and clear the bronchial airways of particles and mucus or as an overreaction to ongoing inflammation. Chronic bronchitis can be a progressive disease; symptoms (listed below) increase over time. Some NIH investigators consider chronic bronchitis a type of COPD.

COPD also includes the entities of emphysema, chronic bronchitis, and chronic asthma. These conditions are not always separable and patients often have components of each. In the case of chronic bronchitis, the fixed airway obstruction, airway inflammation and retained secretions can result in a mismatch of blood flow and airflow in the lungs. This can impair oxygenation of the blood as well as removal of the waste product, carbon dioxide.

Although people of any age can develop chronic bronchitis, the majority of people diagnosed with the disease are 45 years of age or older.

Picture of the structures of the lungs
Picture of the structures of the lungs
Return to Chronic Bronchitis

See what others are saying

Comment from: Joanne, 75 or over Female Published: July 23

I have mucus that seems to set in my throat and when it does, I can't swallow it, so I have to cough it up. This seems to be mostly at night and when I talk on the phone for very long.The mucus is thicker then sputum.

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Comment from: m&m, 55-64 Female (Patient) Published: March 06

I finally quit smoking because of wheezing and cough. I was given prednisone for twelve days, but got a severe cold before I got the medicine, so it didn"t work. I was having asthma attacks for 4 days, but took the medicine for the length. But I still feel terrible. I am trying to find another doctor who can take all the tests in one place, and who will listen to me about my other medical problems. After all the testing over the years, there should be more treatments that work and solve lung diseases!

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