Sudden cold should be caused by cold or low immunity and overexertion, especially in the autumn season when the flu is likely to break out and it is easy to catch a cold without paying attention to body maintenance. During the cold period, you should use medicines such as cold and fever pellets and silver forsythia tablets for symptomatic treatment. At the same time, drink more water, eat more vegetables to supplement dietary fiber, the cycle of the cold is usually 5-7 days, and after recovery, you should regularly exercise outdoors to enhance physical fitness. For older and frail friends who often suffer from colds, you can get a flu shot in the fall to reduce symptoms and try to prevent colds during the winter flu outbreak season.