If it is acute bronchitis, the onset is usually quite sudden and symptoms may include fever, cough, and expectoration. Some patients may experience bloody sputum or symptoms like chest tightness and shortness of breath. Coughing and expectoration often continue for two to three weeks, after which most patients can recover. If it is chronic bronchitis, the onset is often gradual, and symptoms such as coughing, expectoration, and wheezing occur repeatedly. The episodes each year may last for more than three months.