In fact, the cold is a self-limiting disease, that is, without treatment of the cold, will also recover on its own after a week. Half a month is not good for what is generally seen: 1, the most common is a decline in resistance, especially some special groups, such as the elderly, children, pregnant women, resistance is a relatively weak state, the cold is relatively slow. 2, patients with underlying diseases, such as diabetes, kidney disease, hypertension, such patients are also relatively slow to recover from the cold, so we need to strengthen nutrition, pay attention to rest, adjustment. In addition, special groups of people should pay attention to vaccination, if necessary, may also need to infusion, in order to promote the recovery of the cold.