What are the typical symptoms of influenza?

　　Influenza refers to the flu. Under normal circumstances, typical symptoms of influenza include fever, headache, muscle pain, fatigue, coughing, and others. If necessary, it is recommended to seek timely medical treatment. Detailed explanations are as follows:

　　1. Fever

　　After a viral infection, inflammatory mediators are produced in the body. These mediators stimulate the thermoregulatory center of the hypothalamus, causing an increase in body temperature and resulting in fever. Fever is a natural response of the body to viral infection.

　　2. Headache

　　Following a viral infection, pathogenic toxins may stimulate blood vessels and nerves in the head, causing local vasospasm or nerve tension, which can lead to headache.

　　3. Muscle Pain

　　After entering the body, the influenza virus triggers an inflammatory response from the immune system. This inflammatory reaction causes the release of inflammatory mediators in the muscle tissues, resulting in muscle pain.

　　4. Fatigue

　　After infection with the influenza virus, the immune system consumes significant energy to fight the virus. At the same time, symptoms such as fever and muscle pain also increase the body's energy consumption. These factors together cause the patient to feel fatigued.

　　5. Cough

　　After infection with the influenza virus, the mucous membranes of the throat and trachea become irritated, triggering a cough reflex. Coughing helps clear the respiratory tract of viruses and secretions and serves as a self-protective mechanism of the body.

　　In daily life, maintaining adequate sleep, a balanced diet, consuming more foods rich in vitamin C, and engaging in appropriate physical exercise can help the body recover and support immune system function.