Stomach Flu or Influenza?

Do you know the difference between stomach flu and influenza? "Stomach flu" is a popular term but not the true medical diagnosis. The proper medical term for stomach flu is gastroenteritis.

Sometimes people mistake symptoms of stomach flu or gastroenteritis for the viral infection we commonly call "flu," which has symptoms of fever, congestion, muscle aches, and fatigue. Learn more about stomach flu and influenza so you can recognize flu symptoms and seek proper treatment.

How does stomach flu differ from influenza?

Stomach flu actually refers to gastroenteritis or irritation and inflammation of the stomach and intestines (the gastrointestinal tract). Gastroenteritis may be caused by a virus, bacteria, parasites in spoiled food or unclean water, or another trigger such as lactose intolerance, which causes a reaction to dairy products.

Influenza (flu), on the other hand, is a viral infection that mimics a cold except that it starts forcefully with symptoms of fatigue, fever, and respiratory congestion. While more than 100 different virus types can cause a common cold, only influenza virus types A, B, and C cause flu. More severe cases of influenza can lead to life-threatening illnesses such as pneumonia.

In addition, while antibiotics can treat a bacterial infection, antibiotics cannot treat influenza because flu is caused by a virus.

What are the symptoms of gastroenteritis (stomach flu)?

Symptoms of gastroenteritis or stomach flu include abdominal cramps, stomach pain, nausea, vomiting, and diarrhea. You may also have fever, headache, and swollen lymph glands, depending on the type of bug that causes it.

In severe cases of gastroenteritis, loss of bodily fluid can result in dehydration, a life-threatening condition that needs medical attention. Signs of dehydration include sunken eyes, light-headedness, increased thirst, dry or sticky mucous membranes in the mouth, lack of normal elasticity of the skin, decreased urine output, and decreased tears.

You can avoid dehydration by continuing to drink fluids and gradually eating a bland diet such as the BRAT diet (bananas, rice, applesauce, and dry toast). A bland diet is easily digested and is unlikely to irritate your sensitive gastrointestinal system.