There are four phases of the cold process: the prodromal phase, the early phase, the middle phase and the late phase. The prodromal phase of the cold is reversible and can be intervened by means of the body’s weakness, body aches, headaches, insomnia, etc. During the prodromal phase, the body may experience weakness, body aches, headaches and insomnia. In addition, some patients can reverse the cold if they take rest, take certain vitamins and micronutrients and eat properly during the prodromal phase, and then enter the early stage of the cold. In the early stage of the cold, the body will have clinical symptoms and manifestations such as weakness, cough, sore throat, dry throat, etc. The body temperature may not be elevated or may only be mildly elevated at this time, and then it will enter the middle stage of the cold. The symptoms of the middle stage of the cold are the most intense and dramatic, with a marked increase in body temperature, accompanied by cough, coughing, dry throat, sore throat, runny nose or yellow discharge, which lasts for about four days and then enters the late stage of the cold. In the late stage of the cold, the symptoms of the cold will be gradually relieved and it is a clinical healing.