What are the main symptoms of H1N1 influenza?

Primary symptoms of influenza A include sudden high fever, generalized muscle aches, respiratory discomfort, gastrointestinal abnormalities, and deterioration in mental status. If persistent high fever or respiratory distress occurs, prompt medical evaluation and treatment at a hospital are recommended.

1. Sudden high fever: Body temperature rises rapidly within a short period and typically remains elevated for several days. Patients often experience chills, and sweating may occur during temperature fluctuations. Conventional antipyretic measures usually fail to quickly normalize body temperature.

2. Generalized muscle aches: Viral invasion triggers systemic inflammatory responses, causing soreness and pain in muscles of the limbs and lower back. Patients commonly feel fatigued; physical activity exacerbates discomfort, significantly impairing daily functioning.

3. Respiratory discomfort: Soreness and swelling of the pharynx, nasal congestion, rhinorrhea, and dry cough may occur. Inflammatory stimulation of the airway mucosa leads to intermittent coughing. Some individuals develop pharyngeal hyperemia, resulting in discomfort during swallowing; secondary respiratory complications may subsequently arise.

4. Gastrointestinal abnormalities: During the acute phase, some patients experience nausea, vomiting, and diarrhea. Altered gastrointestinal motility leads to decreased appetite and reduced food intake. These symptoms may coincide with fever and are frequently mistaken for common gastrointestinal disorders.

5. Deterioration in mental status: High fever and systemic inflammation rapidly deplete energy reserves, leading to lethargy, excessive drowsiness, diminished responsiveness to external stimuli, and poor recovery even after rest. Overall physical tolerance markedly declines.

During illness, increase intake of warm water to maintain adequate hydration and minimize contact with others by limiting outdoor activities. Ensure sufficient sleep to support immune defense against the virus. Monitor body temperature and mental status closely, and maintain indoor ventilation to reduce the risk of viral transmission.