Colds can cure themselves in a week without medication because they are caused by viral infections, including influenza virus, respiratory syncytial virus, adenovirus, rhinovirus, etc. Since the above-mentioned viruses are very mutable, there are no very effective antiviral drugs for treatment. Taking medication during a cold is mainly to relieve the symptoms, not to treat the cause of the disease. The cold is mainly treated by the person’s resistance, so it can be cured by itself without medication. Just like the current new coronavirus infection, patients with mild cases do not need medication, but can also heal themselves by drinking more water, resting more and improving their resistance. So the cold can be cured by itself in a week without medication, during which you must pay attention to drink more hot water, rest more and rely on your own resistance to treatment.