There are two types of colds: common cold and influenza. 1. Common cold: It is a respiratory disease caused by viral infection with nasal symptoms, commonly known as cold, common symptoms include sneezing, nasal congestion, watery nasal discharge, cough, dry throat, itchy throat, and so on, and the serious ones may have fever, headache and other symptoms, under normal circumstances, adults with normal physical fitness suffering from the common cold can be cured in 5 to 7 days. 2. Influenza: It is an acute respiratory infectious disease caused by influenza virus as the causative factor, and can be subdivided into influenza A and influenza B according to different pathogens. Influenza viruses have a high mutation rate, and the population is generally susceptible to infection and difficult to prevent completely through vaccines. Outbreaks of influenza epidemics can occur worldwide, and severe cases can be life-threatening, and generally require isolation and antiviral treatment to avoid contagion. If you feel unwell, it is recommended that you consult a doctor to determine the cause of your illness and follow the doctor’s instructions for standardized treatment.