Cold is caused by the invasion of the upper respiratory tract, including the nose, pharynx, etc. by pathogenic microorganisms such as viruses or bacteria, resulting in mucosal edema and increased secretion, which leads to nasal congestion and lack of ventilation. This condition is the most common symptom of cold, want to treat can be used to shrink the nasal mucosa blood vessels, reduce edema drugs, the most commonly used is the class of drugs containing pseudoephedrine, such as neo-control, white plus black, Tylenol, etc., can be very good to relieve nasal congestion and non-ventilation. If there is no medicine, you can also use a hot towel to wet compress the nose, the symptoms will also be well relieved, do not have to worry about special.