The common cold is an infection of the upper whistle (above the larynx) caused by a virus or bacteria. The main manifestations of upper influenza are obvious upper whistle symptoms, such as nasal congestion, runny nose, sneezing, sore throat and cough, while the systemic symptoms are mild, such as fever, headache, malaise and general malaise, etc. It is not highly contagious and mostly develops after cold and chill, and there is no obvious seasonality. Influenza, also known as the flu, is an acute respiratory tract infection caused by the influenza virus. Do not underestimate the flu, it is highly contagious and epidemic, and every year there are few deaths worldwide due to influenza. Influenza is characterized by severe systemic symptoms such as chills, high fever, headache, aching limbs, lethargy, nausea, and poor appetite, while upper whistle symptoms such as runny nose, sneezing, sore throat, and cough are mild. There is no obvious seasonality in influenza pandemics, and epidemics are common in winter and spring. There is no specific medication for influenza. Influenza is a self-limiting disease caused by viral infection, and as long as it does not cause complications, it can generally heal naturally in about one week. At present, there is no special treatment for influenza, but the main thing is to rest and drink more water after getting sick. In case of high fever and cough, some antipyretic drugs such as Shuanghuanglian Oral Liquid and phlegm-suppressing drugs can be used to treat the symptoms, but the key is to rest well. Influenza is mainly spread by droplets, and the virus is present in the patient’s respiratory secretions and is discharged from the body with coughing and sneezing. Healthy people may get sick when they come into contact with eating utensils or toys contaminated with the influenza virus. To prevent the spread of influenza, you can start from these aspects: 1, maintain personal hygiene, wash your hands regularly, do not pick your nose and rub your eyes with your hands, and avoid going to crowded places. 2, keep the air in the room fresh, regularly open the windows for ventilation, and regularly disinfect the indoor air. 3, the sudden change in climate is to pay attention to appropriate increase and decrease clothing, pay attention to warmth, do more outdoor activities, exercise, enhance physical fitness and resistance to disease, pay attention to balanced nutrition. 4.It can also be prevented by influenza vaccination.