Generally speaking, acute bronchitis has a sudden onset, with patients often experiencing symptoms such as fever, coughing, and coughing up phlegm, and some patients may have wheezing. With effective treatment, recovery usually occurs within two to three weeks. Chronic bronchitis, on the other hand, typically has a longer course of illness with recurring symptoms, including coughing, coughing up phlegm, chest tightness, and wheezing. The duration of the illness often exceeds two years, with episodes typically lasting more than three months each year.