Colds are usually highly contagious early in the course of the illness. Colds are common respiratory illnesses that can be caused by a variety of viruses and bacteria. In the case of a cold, the patient acts as the source of infection and can spread the virus through sneezing droplets, so patients should wear a mask and avoid crowded areas. Although the virus of common cold is not very contagious, influenza virus, new coronavirus and SARS virus are more contagious. At present, there is no special medicine for viral colds, but only symptomatic treatment to relieve patients of sore throat, runny nose, cough, phlegm, fever and other uncomfortable symptoms. Therefore, it is recommended that we actively participate in physical exercise, avoid straining, strengthen our immunity and resistance, and eat more vegetables, fruits and foods rich in protein.