what causes fever during the flu
Stomach flu happens when your stomach and intestines (also called the gastrointestinal or GI tract) are inflamed and irritated. Causes range from bacteria, viruses, and parasites to food reactions and unclean water. The flu comes with symptoms like fever, congestion, muscle aches, and fatigue. The cause is the influenza virus. More severe cases can lead to life-threatening illnesses like pneumonia. Antibiotics are sometimes used to treat bacterial gastroenteritis, but they don't work against flu viruses. What Are the Symptoms of Stomach Flu? They can include: Cramps in your belly or sides; Stomach pain; Nausea; Vomiting; Diarrhea; You may also have a fever, headache, and swollen lymph glands, depending on the type of germ that causes it. In severe cases, days of throwing up and having diarrhea (or both) can cause your body to lose a lot of moisture.