Bronchitis combined with pneumonia and pneumonia are not the same condition, and it is not possible to directly determine which serious consequences from the name of the disease, in which bronchitis is divided into acute bronchitis, chronic bronchitis. Pneumonia is a condition in which the infection occurs in the terminal bronchial tubes and alveoli. The cause of the disease may be bacteria such as Streptococcus pneumoniae and Staphylococcus aureus, or viruses such as adenovirus and coronavirus. The severity of the symptoms and the degree of the infection is related to the type of causative factor and the state of the body, and it can generally be cured. Acute/chronic bronchitis infection mainly occurs in the bronchial tubes with the presence of pneumonia. Acute bronchitis combined with pneumonia can usually be cured after active treatment and has a good prognosis, while chronic bronchitis combined with pneumonia is more difficult to treat and prone to recurrence. The severity of the consequences of acute/chronic bronchitis combined with pneumonia and pneumonia alone is directly proportional to the severity of the disease and cannot be generalized simply by comparing the names of the diseases.