What are the main manifestations of flu symptoms?

Generally speaking, flu refers to influenza, whose symptoms mainly include high fever, shortness of breath and chest tightness, nasal congestion and runny nose, muscle pain, headache, etc. A detailed analysis is as follows:

1. High Fever

Influenza viruses replicate in the body and stimulate the immune system to produce pyrogens, which act on the body's temperature-regulating center, causing body temperature to rise above 39°C and persist for several days.

2. Shortness of Breath and Chest Tightness

Influenza virus infection may cause lung inflammation and impaired lung function, affecting gas exchange and respiratory function, thereby causing symptoms such as shortness of breath and chest tightness.

3. Nasal Congestion and Runny Nose

Influenza viruses may adhere to the nasal mucosa, subsequently invading mucosal cells, leading to nasal mucosal congestion, edema, and local inflammatory response, resulting in a runny nose.

4. Muscle Pain

Influenza viruses lead to the accumulation of metabolic products such as lactic acid in the body. Additionally, the inflammatory response caused by the virus may stimulate nerve endings, resulting in pain in muscles or joints throughout the body.

5. Headache

Influenza viruses may stimulate head blood vessels and nerves, causing local vasospasm and inflammatory reactions, resulting in head pain, which may also be accompanied by nausea and vomiting.

However, it should be noted that influenza symptoms may vary from person to person, and symptoms may gradually worsen as the illness progresses. In daily life, maintaining good living habits and dietary planning, as well as enhancing physical immunity, can help prevent the occurrence of influenza.