The new coronary vaccine, also known as the novel coronavirus vaccine, it is not normal to develop a cold after the third dose of the vaccine. It may be an adverse reaction to the vaccine or a cold caused by exposure to the cold or other conditions, but both conditions will get better most of the time and only require symptomatic treatment without undue concern. The third dose of the novel coronavirus vaccine helps to further prevent novel coronavirus infections and usually does not cause a cold. If cold symptoms persist after the third dose of vaccination, this is usually abnormal and may be due to cold or overwork, etc. It is recommended to go to the hospital immediately for a clear diagnosis and symptomatic treatment. If there is only a transient cold symptom after the third vaccination, it may be an adverse reaction to the new coronavirus vaccine, such as cough, fever, runny nose, etc., which is very similar to the manifestation of a cold, but is not a true cold. Recipients should be aware that whether it is a true cold or an adverse reaction to vaccination, the symptoms of a cold should be treated promptly under the guidance of a physician, and if the symptoms persist, the patient should inform the physician to avoid serious consequences.