Most colds are caused by viruses or bacteria from the respiratory tract invading the nasal mucosa of the upper respiratory tract, resulting in swelling and edema of the nasal mucosa, as well as the appearance of secretions blocking the nasal cavity, resulting in nasal insufflation. As long as the blood vessels of the nasal mucosa are constricted and the edema of the nasal mucosa is reduced, the situation of nasal disinflation will be significantly improved. Commonly used drugs such as Contec, white plus black, Tylenol, which contain pseudoephedrine, can make the nasal mucous membrane edema reduced a lot, can be very effective in improving the symptoms of cold hyperventilation. If there is no medication, you can use a hot towel on the nose, which can also reduce the symptoms.