Mild influenza A (H3N2) infections can be treated without medication, and those with symptoms can be treated symptomatically and closely observed for changes in condition; for those with severe illness or risk factors for severe influenza, early antiviral treatment is needed, and antiviral drugs such as oseltamivir and zanamivir can be used. Mild cases of influenza A (H3N2) are often similar to those of the common cold, but with more pronounced fever and systemic symptoms. After diagnosis of mild illness, home isolation is needed to keep the room ventilated while closely observing changes in the condition. Take sufficient rest, drink plenty of water, eat easy-to-digest and nutritious food, and apply ibuprofen to relieve symptoms such as fever and runny nose, etc. Generally, the infection can be cured within 2 to 3 days after infection. For patients with severe illness or high risk factors for severe influenza (such as the elderly aged 65 and above, people with chronic underlying diseases such as diabetes, heart disease, etc.), antiviral treatment is needed within 48h of the onset of the disease. Influenza A (H3N2) viruses are more sensitive to antiviral drugs such as oseltamivir and zanamivir, and they can be used under the guidance of a doctor.