The Flu Burden: Protection Against Influenza and Norovirus
November 17, 2025 | Tags:
Have you ever felt under the weather and thought, “I might have the flu”? Influenza and norovirus are some of the most common viral illnesses that peak during colder months. Medical Mutual’s doctors break down the differences so you can know which treatment is right for you and recognize when to see your primary care provider (PCP).
Influenza aka “the flu”
Influenza, or “the flu”, is a contagious respiratory illness caused by the influenza virus. Cases range from mild to severe, with symptoms including:
- Cough
- Sore throat
- Stuffy or runny nose
- Chills
- Headache
- Fatigue
- Muscle or body aches
- Fever, in some cases
Flu symptoms usually occur one to four days after exposure, but you’re contagious for up to one week after. Most influenza treatments can be done at home with over-the-counter medications, plenty of rest and fluids. Antivirals can also be prescribed to lessen symptoms and to reduce time away from family, friends and coworkers.
Norovirus aka “the stomach flu”
Norovirus, or “the stomach flu”, is a bit of a misnomer. Norovirus isn’t a respiratory virus but instead causes gastroenteritis, an inflammation of the stomach and intestines that results in distinct and severe symptoms like:
- Nausea
- Vomiting
- Diarrhea
- Stomach cramping or pain
Headaches, fever or body aches can occur, but are less common. Norovirus is highly contagious. Symptoms usually occur 12 to 48 hours after exposure and can last one to three days, although the virus can still be in your system for up to two weeks. No cure exists for norovirus, but your body will manage the infection on its own. Drink plenty of fluids with electrolytes, get lots of rest and eat soft, bland foods if possible.
How to prevent illness
Our doctors recommend taking precautions to reduce your risk of influenza and norovirus this season. This includes:
- Washing hands often with soap and water.
- Cleaning and sanitizing frequently touched surfaces and objects.
- Avoiding people when they or you are sick.
- Not sharing food or eating utensils.
For influenza, cover your nose and mouth when you sneeze or cough and stay home until your symptoms get better and you’re fever free for 24 hours without fever reducing medications. For norovirus, follow food safety practices like washing fruits and vegetables before eating and cooking foods to safe minimum temperatures.
Talk to your PCP about options to protect yourself and others this flu season, like scheduling a flu shot. Medicare Advantage members can receive a flu shot for a $0 copay at in-network pharmacies or your next PCP visit. To find a PCP and pharmacies near you, use our provider search tool at MedMutual.com/FindAProvider or call the Customer Care phone number listed on your member ID card.