Colds are divided into hot colds and cold colds, which are usually caused by cold, chill or heat. 90% of them are viral infections of the upper respiratory tract, and the early symptoms are cough, sore throat, sneezing and runny nose, which can be completely cured and will not evolve into bronchitis if they are treated actively. If the early treatment is not timely, the condition will easily develop further and evolve into bronchitis, which is manifested by the disappearance of symptoms of upper respiratory tract infection such as runny nose and sneezing at the late stage of cold, and the manifestation of cough, phlegm, sore throat, wheezing, and even fever symptoms. Therefore, the early stage of cold should be treated actively to avoid the development of bronchitis.