Patients usually do not need fluids after a cold because upper respiratory tract viral infections are self-limiting and usually last for 5-7 days. When the body’s immunity is strengthened, the viral infection can gradually improve, but in the case of elderly patients with severe symptoms or underlying diseases, infusion therapy may be an option. Cold refers to upper respiratory tract infection, i.e. infection in the larynx and respiratory tract above the larynx, including the nasopharynx, oropharynx, and larynx, mainly manifested as nasal congestion, runny nose, sore throat, fever, general malaise, and manifestations of infection poisoning, such as general muscle aches and headache. The more common infectious agents of upper respiratory tract infection are viruses, such as adenovirus, respiratory syncytial virus, coxsackievirus, coronavirus, influenza virus, etc. There is no need to apply antibiotics at this time. However, a small number of patients can be combined with bacterial infections, such as Haemophilus influenzae, Streptococcus haemolyticus and Catamorax, etc., which need to be treated with antibiotics. In addition to anti-infection treatment, symptomatic supportive treatment for upper respiratory tract infection is also more important.