Cold and flu should be considered to be caused by low immune function, which leads to the prolonged propagation of bacterial pathogens in the body. First of all, you should go to the routine blood test to see whether the blood test is elevated, if the blood test is elevated, it is considered to be a bacterial infection, and antibiotic drugs should be used in the treatment. If the old and weak people have a long time to get a bad cold, can be appropriate injection of immunoglobulin to improve the body’s immunity, help to speed up the body to pathogenic microorganisms clearance. During the period of treatment, we should pay strict attention to rest, avoid overwork, should also drink more water, eat more fruits and vegetables, supplement vitamin C. After recovering from the cold, we should strengthen physical exercise to enhance physical fitness, and try to prevent colds.