Common Flu Symptoms: What to Watch For

1. Fever
   One of the hallmark symptoms of the flu is the sudden onset of a high fever. A fever is generally defined as a body temperature of 100.4°F (38°C) or higher. Fevers are the body's way of fighting off infections and are a typical response to the flu virus. If you or someone you know develops a fever, especially with other flu-like symptoms, it strongly indicates that the flu may be the culprit.
2. Cough
   A persistent cough is another common flu symptom. This cough is often dry and can be quite irritating. It may linger for several weeks after other symptoms have improved. Coughing is a natural response to the inflammation and irritation in the respiratory system caused by the flu virus.
3. Sore Throat
   A sore throat is often an early symptom of the flu. It can be mild to severe and is typically accompanied by discomfort when swallowing. Like the cough, a sore throat results from the inflammation caused by the virus in the throat and upper airways.
4. Body Aches and Muscle Pain
   Muscle aches and pains are a telltale sign of the flu. These symptoms can be quite severe and are usually accompanied by a feeling of weakness and fatigue. The flu virus can cause muscle inflammation, leading to discomfort and pain.
5. Headache
   Many people with the flu experience headaches, which can be quite severe. These headaches are often described as throbbing and may accompany other symptoms like sinus congestion and pressure.
6. Fatigue
   Extreme tiredness and fatigue are common flu symptoms. Even after a good night's sleep, you may feel exhausted and have difficulty performing your daily activities. This fatigue can last for several weeks after other symptoms have subsided.
7. Congestion and Runny Nose
   Flu can also affect the nasal passages, leading to congestion and a runny nose. While these symptoms are more commonly associated with the common cold, they can also be present in some flu cases.
8. Nausea and Vomiting
   Although less common than the other symptoms mentioned, some people with the flu may experience nausea and vomiting. These gastrointestinal symptoms are commonly seen in children but can also affect adults.
9. Chills
   Shivering and chills often accompany the fever associated with the flu. This is your body's response to the elevated temperature caused by the infection.

1. Difficulty breathing or shortness of breath
2. Chest pain
3. Confusion
4. Severe vomiting
5. High fever that doesn't respond to fever-reducing medication