Nausea
Another clear symptom of stomach flu is nausea or vomiting, which is often related to stomach issues. Just like the previous sign, this is simply a natural reaction of the body to the attack of a hazardous infection caused by viruses or bacteria. By doing this, you can get rid of unwanted and harmful components from the stomach. However, keep in mind that this can also be caused by many other health issues. Normally, nausea by gastroenteritis is often accompanied by a fever or diarrhea. Otherwise, make sure to visit your doctor for a precise diagnosis and treatment. [2]
