What are the symptoms of contracting influenza A?

Influenza A refers to influenza caused by type A influenza virus. Symptoms of influenza A may include fever, headache, muscle pain, fatigue, and similar symptoms.

1. Fever

Fever is one of the most common symptoms of influenza A. It typically begins to appear within 1-2 days after infection. Body temperature rises rapidly and generally reaches 39°C or even higher; in some cases, it may exceed 40°C. This high fever can last for 3-5 days.

2. Headache

The headache caused by influenza A is often severe and usually presents as a distending or pulsating pain on both sides of the head. The entire head may feel painful, sometimes accompanied by soreness around the eye sockets. In severe cases, the headache can significantly affect a patient's daily activities.

3. Muscle Pain

Patients may experience a deep aching and fatigued feeling in the muscles, similar to the sensation following intense physical exercise. This muscle pain can make body movements difficult, and simple actions such as lifting the arms, bending over, or walking may trigger more intense aching.

4. Fatigue

Patients may feel generally weak and extremely tired, with the fatigue often persisting even after adequate rest. This sense of fatigue can affect various aspects of physical and mental functioning, significantly limiting both physical and cognitive activities in daily life.

In daily life, maintaining good personal hygiene habits, such as washing hands frequently and covering the mouth and nose when coughing or sneezing, can also help prevent the spread of the virus.