What is the main cause of bronchitis?

The most important cause of chronic bronchitis is cigarette smoking. Air pollution and your work environment may also play a role. This condition causes a cough that's often called smoker's cough. It also causes you to cough up mucus, wheeze, and have chest discomfort.

Can you catch bronchitis from someone else?

It's usually not contagious, so you typically can't get it from another person or pass it onto someone else. People with this condition often have a phlegmy cough, but even if you are in close contact with them when they are coughing, if the illness is not caused by infection, you won't catch it.