The stomach flu, also called gastroenteritis or intestinal flu, is caused by a virus that infects the intestines. The virus is often contracted through contaminated food or drinks. The Mayo Clinic suggests that intestinal flu is a mild ailment, but it is more serious, even deadly, in infants, older adults or other individuals with compromised immune systems. Intestinal flu is not related to the seasonal influenza that affects the respiratory system, and it has distinct signs that predominantly affect the gastrointestinal system.
Diarrhea
Frequent, watery stools are one of the primary signs of intestinal flu. Typically, blood is not present in the stools. The Mayo Clinic suggests blood to be an indicator of a more severe infection. Diarrhea may begin 1 to 3 days after the virus has been contracted. Diarrhea and vomiting can lead to dehydration. Signs of this include dizziness, severe weakness, reduced urination, darkened urine, dry mouth or excessive thirst.
Vomiting
Vomiting can accompany intestinal flu diarrhea. Nausea may or may not occur with the vomiting. Like diarrhea, vomiting can last 1 or 2 days. A more serious case of intestinal flu may last as long as 10 days. Medical treatment is necessary for individuals who are unable to keep liquids down for 24 hours or more. This is also true if vomiting has persisted more than 2 days or the vomit contains blood.
Pain
Diarrhea and vomiting can cause mild to moderate abdominal cramping and pain. Sometimes, you may experience muscle aches throughout your body. A headache is another symptom accompanying the other signs of intestinal flu. Children who are in a great deal of pain or discomfort should be seen by a doctor. Medical care should be provided to a child who becomes lethargic or irritable.
Fever
Intestinal flu may cause a low-grade fever. A fever over 104 degrees F is an indicator of a more serious infection and should be treated by a doctor. Chills may accompany the fever, as can general fatigue, suggests eMedTV.com.
