Most of the cold types of upper respiratory tract infections that are self-healing refer to common infections, which are mainly caused by viral infections and have a certain degree of self-healing. Generally need to go through three stages, specific introduction is as follows: 1. Early stage of cold: the onset of the disease is more acute, mainly manifested as nasal symptoms, such as sneezing, nasal congestion, watery nasal discharge, but also may be manifested as cough, dry throat, throat itching or burning sensation or even post-nasal drip feeling. 2. Middle stage of cold: the nasal mucus becomes thicker after 2-3 days, which may be accompanied by sore throat, headache, tearing, dull taste, dyspnea, hoarseness, etc. Sometimes, hearing loss may be caused by pharyngotracheitis. In severe cases, there are fever, mild chills and headache. 3. In the late stage of cold, when the disease develops to about the 5th-7th day, the fever gradually subsides, the symptoms such as runny nose and cough are reduced, and most of the patients will feel better mentally. For some immunocompromised people, the duration of illness may be prolonged after a cold. Although the common cold in upper respiratory tract infection can be cured by itself, it may cause complications. If you feel seriously ill, you should consult a doctor in time and avoid unauthorized medication.