The causes of recurrent colds include poor immunity and frequent occurrence of influenza, etc. The solutions include strengthening exercise and nutrition, and taking general measures such as self-protection. Recurrent colds are generally considered to be caused by poor immunity and frequent occurrence of influenza, especially among the elderly, children, and people with underlying medical conditions, who are prone to catching colds and flu because of their relatively low immunity. At the same time, during the flu season, such as winter, it is easier to be infected by the flu virus, resulting in frequent colds. It is recommended to strengthen nutrition and exercise in daily life, eat more fruits, vegetables, lean meat, eggs and other foods high in vitamins and proteins, as well as jogging, swimming and other exercises to strengthen the physical fitness, wear a good mask in the influenza epidemic season, pay attention to the disinfection of the hands, and do a good job of self-protection. If the flu occurs repeatedly, it is recommended to consult a doctor in time to improve the relevant laboratory tests to exclude the combined immunodeficiency diseases.