Bronchitis is not a cold. Bronchitis is distinctly different from a cold in that a cold is an acute upper respiratory tract infection, which is an upper respiratory tract infection, while bronchitis is a lower respiratory tract infection. The clinical symptoms of bronchiectasis and bronchiectasis are also different. Patients with colds mostly have upper respiratory tract symptoms such as nasal congestion, runny nose, sneezing and watery eyes, often accompanied by sore throat, and some patients may also have generalized soreness, weakness and hypothermia. Patients with bronchiectasis have milder upper respiratory cicatricial symptoms, mainly coughing with or without coughing sputum as its manifestation. In patients with bronchitis, chest radiographs can show thickened and disturbed textures in both lungs, whereas in patients with colds, there are no such manifestations. Of course, some patients with viral colds can develop bronchitis secondary to their condition not being effectively controlled, so attention should be paid to differentiation.