WebMD Answers
Symptoms of acute bronchitis usually begin 3 to 4 days after an upper respiratory infection, such as a cold or influenza (flu). Symptoms usually include:
Most cases of acute bronchitis in otherwise healthy people last only 2 to 3 weeks. But more than 20% of people with acute bronchitis have a cough that lasts more than 4 weeks.2
Often it is hard to tell the difference between viral and bacterial forms of acute bronchitis, and many conditions have symptoms similar to acute bronchitis, such as asthma and pneumonia. Because pneumonia can be a serious complication, it is important to know the differences between acute bronchitis and pneumonia. For example, a high fever, shaking chills, and shortness of breath often occur with pneumonia but not with acute bronchitis.
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