A viral cold is a cold caused by infection with a virus. Infection with a virus is mainly caused by the presence of a virus that spreads in water, air and other media, thus making the patient infected with the virus. The reason for being easily infected with a viral cold may also be because the individual has a weaker constitution and poorer resistance, thus easily causing a viral cold, which is often referred to as an upper respiratory tract infection. The symptoms of viral colds can be different for each person because of their different constitution. The symptoms of viral colds include dry throat, hoarse voice, sneezing, runny nose and cough. Systemic symptoms include loss of appetite, general weakness, general weakness, low or high fever, and fear of cold. Viral colds usually last 3-7 days.