Viral colds are contagious, and in general, they are usually a disease that is spread through the respiratory tract, but this also has a lot to do with the quality of the individual. There are also many viral particles in the air, and if a healthy person inhales the viruses in the air, he or she is likely to get the flu. The most common cold virus is the influenza virus, which is also categorized as influenza A, influenza B, etc. Influenza viruses are also more contagious viruses. There are also viruses that are not as contagious, but they are all contagious. The onset of the disease depends on the patient, the means of transmission and the susceptible population, and it is also easy to develop the disease if its own resistance is not strong and its vital energy is weak. The spread of the virus is mainly through the respiratory tract, but there is also a high probability of contracting the virus if one is in close contact with a sick person. In Chinese medicine, it is emphasized that if the patient’s own resistance is strong and his or her positive energy is sufficient, he or she will not develop the disease. In conclusion, the virus is contagious, and its spread is mainly airborne, but not everyone who comes into contact with the virus will develop the disease.