Colds are sometimes mild and sometimes severe due to different types of viruses and bacteria that infect the body, and the corresponding clinical symptoms can vary. The common cold is caused by a viral infection, commonly known as ‘cold’. The onset of the disease is relatively rapid, and the main symptoms are: runny nose, sneezing, nasal congestion, and postnasal drip, with or without fever, lacrimation, and irritation in the patient’s throat, such as sore throat, which is obvious when swallowing, but the chest physical examination is normal. Patients with immune deficiency sometimes have hearing loss due to inflammation of the eustachian tube. In severe cases, there are fever, mild chills and headache, etc. Once fever appears, it indicates the existence of inflammation, and patients should go to the hospital for examination at this time, not to treat it as a small cold and just take some medicine. The common cold usually heals in 5-7 days, but complications can prolong the course of the illness. Influenza for short, incubation period 1-3 days, the onset of the disease is rapid, patients have high fever, headache, fatigue, general muscle aches and other obvious symptoms of poisoning. Since the antigenicity of the influenza virus (a substance that attacks the body) changes quickly, the body is unable to acquire lasting immunity. The best way to cope with the flu on a daily basis is to exercise regularly and develop good hygiene habits. Once you have a cold, you should drink plenty of hot water.