How to Tell If You Have Norovirus — and What to Do About It

What Is Norovirus?

Norovirus is a highly contagious stomach bug that causes vomiting and diarrhea. It spreads through contaminated food, surfaces, or close contact — and it takes only a few viral particles to make you sick.

Quick Facts:

• Norovirus is viral, not bacterial — antibiotics won’t help.
• It can survive on surfaces for days.
• You’re still contagious for several days after symptoms stop.

Common Norovirus Symptoms

Symptoms usually begin 12–48 hours after exposure and last 1–3 days.

Main Symptoms:

• Nausea and sudden vomiting
• Diarrhea
• Abdominal cramps or bloating

Other Possible Symptoms:

• Headache or muscle aches
• Chills and fatigue
• Low-grade fever
• Loss of appetite

Watch for dehydration: dry mouth, dark urine, dizziness, or reduced urination — especially in young children or older adults.

When to See a Doctor

Call your provider if you experience:

• Symptoms lasting > 3 days
• Inability to keep fluids down
• Green/yellow (bile) or bloody vomit
• Severe stomach pain or fever

Schedule a visit with a BASS Primary Care Provider for hydration support or advanced evaluation.

Norovirus Treatment Tips

There’s no antiviral cure — treatment focuses on rest and rehydration.

At-Home Recovery Steps:

1. Sip fluids often (water, Pedialyte, diluted juice).
2. Eat light foods: BRAT diet — Bananas, Rice, Applesauce, Toast.
3. Rest — avoid strenuous activity.
4. Skip sugary, caffeinated, or alcoholic drinks.
5. Use oral rehydration or electrolyte tablets if needed.

If dehydration worsens, IV fluids may be necessary.

How to Prevent Norovirus Spread

• Wash hands with soap and warm water ≥ 20 seconds.
• Clean surfaces with bleach-based disinfectants (5–25 Tbsp bleach per gallon of water).
• Avoid food prep for 48–72 hours after symptoms stop.
• Wash laundry, bedding, and towels thoroughly.
• Cook shellfish well and rinse fruits/vegetables before eating.

Pro Tip: Hum the song “Jingle Bells” while washing your hands — it lasts about 20 seconds!

When to Get Care at BASS Medical Group

Most cases resolve on their own, but persistent vomiting or dehydration can require medical attention.
Our Primary Care and Gastroenterology teams can:

• Diagnose gastrointestinal infections
• Provide hydration support and anti-nausea treatments
• Recommend prevention steps for your family

Serving patients primarily in Walnut Creek, Oakland, and the Greater Bay Area.  Request an Appointment Today!

Frequently Asked Questions

How can I tell if I have norovirus or food poisoning?‍

Norovirus symptoms appear suddenly and often include vomiting and watery diarrhea within 12–48 hours of exposure, while bacterial food poisoning may take longer and can include fever.

How long am I contagious with norovirus?‍

People are most contagious while sick and for up to 2–3 days after recovery. Wash hands and disinfect surfaces during that time to prevent spread.