A cold is a common self-limiting disease in daily life, and it is also somewhat contagious. For treatment and examination, one can visit the general internal medicine department or the respiratory department at a hospital. If it is a severe contagious cold, such as an epidemic influenza, it is advisable to go to the infectious disease department of the hospital for examination. The main principle is symptomatic treatment and antiviral management, while avoiding stress. Mild cases may recover on their own within three to seven days without medication or treatment, simply by resting and drinking plenty of water. However, if the symptoms are severe, timely examination should be sought to prevent complications.