Early symptoms of H1N1 flu

Influenza A is a respiratory infectious disease caused by the Influenza A virus. The initial symptoms of Influenza A are often similar to those of the common cold. Fever: Elevated body temperature is a common symptom of Influenza A, often reaching above 38°C. Cough: Patients may develop coughing; in severe cases, symptoms such as chest tightness, shortness of breath, and other signs of respiratory distress may occur. Runny nose: Nasal congestion and runny nose are common, resembling symptoms of the common cold. Sore throat: Patients may experience throat pain, sometimes accompanied by sore or swollen throat and fatigue. In addition, Influenza A may also cause symptoms such as headache, muscle aches, vomiting, and diarrhea. Patients experiencing these symptoms should seek medical attention promptly and receive appropriate treatment.