Colds are acute upper respiratory tract infections caused by viruses, mostly occurring in cases of lowered body resistance such as exertion and cold weather, and are divided into common infections and influenza. Common cold is more common in life, mainly manifested as nasal symptoms, commonly sneezing, runny nose, nasal congestion, etc. It can also be manifested as cough, coughing, pharyngeal discomfort (dry throat, itchy throat, burning sensation in the throat, sore throat), etc. The nasal discharge usually thickens after 2-3 days, followed by symptoms such as sore throat, headache, sore and watery eyes, weakness, sluggish taste, etc. In severe cases, there can be fever and chills. The disease is self-limiting and usually heals in 5-7 days. Influenza is an acute respiratory tract infection caused by influenza virus. Compared with the common cold, it is mostly characterized by systemic symptoms clinically, and may also present with abnormal liver function and other manifestations, mostly in the form of sudden onset of high fever, cough (often dry), sore throat, runny nose or headache, fatigue, muscle or joint pain, and general malaise. In addition, sometimes gastrointestinal symptoms such as nausea and vomiting are also the main manifestations. The disease is more serious than the common cold, and complications such as pneumonia, neurological damage, heart damage and septic shock can occur, which can be life-threatening in severe cases. Cold treatment is mainly symptomatic, and for influenza, early antiviral treatment is very important.