Symptoms of a stomach virus include abdominal cramps, abdominal pain, nausea, vomiting, watery diarrhea without blood and low fever, according to Mayo Clinic. Bloody diarrhea is often indicative of a more serious condition and requires medical attention.
Medical attention is required if a stomach virus keeps a person from being able to keep down water for more than 24 hours. Other symptoms that require medical attention include vomiting for over two days, vomiting blood, bloody bowel movements or a fever above 104 degrees Fahrenheit. Symptoms of dehydration, such as excessive thirst, dry mouth, deep yellow urine, very little urine, severe weakness or dizziness, also require medical attention. Infants or children should receive medical attention if they have fevers of above 102 degrees Fahrenheit.
A stomach virus, often called a stomach flu, is actually an infection of the intestines, and is not related to the virus that causes influenza, according to Mayo Clinic. The condition caused by a stomach virus is known as gastroenteritis, and the most common viruses responsible are noroviruses and rotaviruses. Noroviruses are most commonly spread by contaminated food, but transmission by contact between people is possible. Rotaviruses most commonly cause symptoms in children, and adults can spread the virus even if they have no symptoms.