What are the symptoms of H1N1 flu?

Generally, "Avian Flu" refers to Influenza A. Symptoms of Influenza A include high fever, sore throat, nasal congestion and runny nose, diarrhea, body weakness, and muscle pain. Detailed explanations are as follows:

1. High Fever

High fever is a typical symptom of Influenza A. When the virus attacks the immune system, it causes an inflammatory response in the body, leading to elevated body temperature. The patient's temperature often exceeds 39°C, accompanied by chills and shivering.

2. Sore Throat

After entering the body through droplets or contact, the Influenza A virus replicates on the respiratory mucosa and triggers an immune response, causing congestion, swelling, and pain in the throat mucosa, which results in a sore throat.

3. Nasal Congestion and Runny Nose

Influenza virus infection affects the nasal mucosa, causing congestion and swelling of the mucosa, leading to symptoms such as nasal congestion and runny nose. Patients may feel difficulty breathing, and severe nasal congestion can even affect sleep.

4. Diarrhea

The Influenza A virus may spread to the digestive system through the bloodstream or lymphatic system. Within the digestive system, the virus damages the integrity of the intestinal mucosa and affects the normal absorption and secretion functions of the intestines, resulting in diarrhea.

5. Body Weakness and Muscle Pain

During the illness, patients with Influenza A often experience general weakness and muscle pain. This is due to increased energy consumption and the accumulation of metabolic byproducts caused by the viral infection, which leads to muscle soreness.

However, it should be noted that not all patients with Influenza A will exhibit all of the above symptoms, and the severity of symptoms can vary from person to person. If you experience similar symptoms, it is recommended to seek timely medical attention for accurate diagnosis and treatment by a physician.