A cold that stays bad doesn’t necessarily mean there is a major illness. Cold is a very common acute upper respiratory tract infectious disease, mostly caused by viral infections. The common cold is mainly characterized by upper respiratory tract symptoms, such as nasal congestion, runny nose, etc. It is self-limiting, and the general course of the disease is 5 to 7 days. Influenza is mainly characterized by systemic toxic symptoms, such as high fever, generalized body aches, headache, etc. It usually requires active antiviral treatment to improve the symptoms. The recovery time of influenza is related to the immunity of the individual. If one’s immunity is relatively poor, it will lead to a prolonged course of the cold. In particular, some immunocompromised patients may also develop complications of the cold, such as viral myocarditis, which may prolong the duration of the cold. Meanwhile, it should be noted that cold symptoms, such as recurrent nasal congestion and runny nose, may not necessarily be caused by colds, but also by other diseases, such as allergic rhinitis, nasopharyngeal carcinoma, etc. If the symptoms of colds continue to be bad or aggravated, it should be alerted and go to the hospital to find out the cause of the disease and treat it actively. During the cold period, we should pay attention to personal care, appropriate physical exercise, open the windows diligently to maintain the circulation of indoor air.