No, they are not. The "stomach flu" is a disease known as viral gastroenteritis and is not caused by influenza viruses. The flu, cause by influenza viruses, is a respiratory (lung) disease, not a stomach or intestinal disease. The main symptoms of the flu are:
- Dry cough
- Extreme tiredness
- Fever (usually high)
- Headache
- Muscle aches
- Sore throat
Stomach symptoms, such as nausea, vomiting, and diarrhea, also can occur but are more common in children than adults.