What are the symptoms of influenza A infection?

Generally speaking, swine flu refers to influenza A. Symptoms of influenza A infection include fever, cough, runny nose, muscle aches, fatigue, and tiredness. Detailed analysis is as follows:

1. Fever

After the influenza A virus invades the human body, the body's temperature regulation center is affected, leading to an increase in body temperature and resulting in fever. The patient's body temperature may reach 39~40℃, and the fever may persist for a prolonged period.

2. Cough

The influenza A virus may irritate the respiratory mucosa, causing coughing. The cough may be dry or accompanied by phlegm, depending on the degree of irritation to the respiratory mucosa and the amount of mucus produced.

3. Runny Nose

Following infection with the influenza A virus, the virus may adhere to the nasal mucosa and subsequently invade the mucosal cells, causing nasal mucosal congestion, edema, and a local inflammatory response, leading to a runny nose.

4. Muscle Pain

After contracting influenza A, the body produces acidic metabolic substances that accumulate in the muscles, causing muscle pain. Patients may experience headaches, back pain, and limb soreness.

5. Fatigue and Tiredness

After invading the human body, the influenza A virus may affect the immune system, leading to a decline in the patient's immunity and resulting in symptoms such as fatigue and tiredness. Patients may feel weak throughout the body and experience low spirits.

However, it should be noted that symptoms of influenza A infection can vary from person to person. In daily life, maintaining good living habits and dietary planning, as well as enhancing the body's immunity, can help prevent the occurrence of influenza A.