Chronic bronchitis is also known as "old chronic bronchitis." From the name, it can be inferred that its cough and expectoration last for a long time and its onset is slow, which can manifest as acute exacerbation. The main symptoms of chronic bronchitis are cough and expectoration, either with or without wheezing. The cough in chronic bronchitis usually occurs in the morning, meaning that the cough is more pronounced upon waking up. The sputum is generally white, sticky, mucoid, or frothy, and may occasionally contain streaks of blood but generally is not associated with coughing up blood. In addition to coughing and expectoration, a small number of patients may experience wheezing or shortness of breath. In cases where the wheezing is more pronounced, it is also referred to as asthmatic bronchitis.