Cold is mainly a viral infection, and symptoms such as body aches, weakness of limbs and headache are among the common symptoms of cold. The fever causes the body muscles to produce lactic acid due to anaerobic respiration, which causes the symptoms of generalized aches and pains. The body’s resistance and immunity are reduced after a cold, and it is common to have symptoms of weakness and pains in the limbs. Colds are also called colds in Chinese medicine and acute upper respiratory tract infections in Western medicine, mainly manifested as fever, headache, cough, runny nose, sneezing and other symptoms, and are divided into two types of common colds and influenza. The common cold can generally be cured within 3-5 days. Influenza starts rapidly, progresses quickly, has heavy symptoms and has a long course. If the cold is always bad, it is important to clarify whether it is a common cold or an influenza, the course of which is different. It should be noted that if the so-called cold lasts more than two weeks, it may be a manifestation of rhinitis, which needs to be further ruled out at the hospital. Some children with immunocompromised or immunodeficiency will have frequent colds that are always bad and need to be screened for immune function.