Colds can be divided into viral and bacterial colds. And it is usually viral and is self-limiting, which means that patients with mild colds can recover without treatment, usually in 3 to 7 days, by ventilation, keeping warm, taking more rest, drinking more water and eating lightly. It is important to note that antibiotics should not be taken after a cold. Because the pathogens that cause colds are mainly viruses, and most antibiotics have no effect on killing viruses, and the abuse of antibiotics can lead to adverse drug reactions and bacterial resistance. Antibiotics should only be used after a cold to stimulate a bacterial infection, and the appropriate antibiotic should be chosen under the guidance of a doctor.