{"id":19008,"date":"2025-03-26T10:00:48","date_gmt":"2025-03-26T15:00:48","guid":{"rendered":"https:\/\/www.osfhealthcare.org\/blog\/?p=19008"},"modified":"2026-04-16T10:50:12","modified_gmt":"2026-04-16T15:50:12","slug":"food-poisoning-vs-norovirus-how-to-tell-the-difference","status":"publish","type":"post","link":"https:\/\/osf-blog.live.imagescape.com\/blog\/food-poisoning-vs-norovirus-how-to-tell-the-difference\/","title":{"rendered":"Food Poisoning vs. Norovirus: How to tell the difference"},"content":{"rendered":"

We\u2019ve all been there. The telltale stomach churn that sends you running to the bathroom.<\/p>\n

No matter what causes them, symptoms like vomiting and diarrhea can derail your day and spread like wildfire throughout your home.<\/p>\n

But how do you know when it\u2019s \u201cjust something you ate\u201d vs. the dreaded stomach flu \u2013 and how does that impact what you do next?<\/p>\n

Susan Wolf, clinical director of OSF OnCall Digital Care, discusses the key differences between food poisoning and norovirus and how to handle both scenarios.<\/p>\n

What causes food poisoning and norovirus?<\/h2>\n

\u201cOne of the key differences comes down to the cause,\u201d says Susan. \u201cFood poisoning is always caused by something you ate or drank, while norovirus is viral and is spread easily by person-to-person contact or contaminated surfaces.\u201d<\/p>\n

Food poisoning:<\/strong> Caused by contaminated food or drink, often by bacteria, viruses or toxins from improperly prepared or stored foods.<\/p>\n

Norovirus (Stomach flu): <\/strong>Also known as acute gastroenteritis, this highly contagious virus causes inflammation of the stomach and intestines. Norovirus can also be transmitted via food or drink in the form of food poisoning. It\u2019s most common in the winter and is caused by direct contact with infected individuals or surfaces.<\/p>\n

What are the common symptoms of norovirus and food poisoning?<\/h2>\n

Many of the symptoms of food poisoning and norovirus overlap, but there are a few differences.<\/p>\n

Food poisoning: <\/strong>Symptoms include nausea, vomiting, diarrhea (sometimes bloody or mucousy) and abdominal cramping.<\/p>\n

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Not sure about your symptoms and need care?<\/p>\n

Get care now<\/a><\/p>\n<\/div>\n

Norovirus: <\/strong>Symptoms include nausea and vomiting, diarrhea, abdominal cramping, low-grade fever, fatigue and headache.<\/p>\n

So how do you know if you have food poisoning or norovirus?<\/p>\n

\u201c<\/strong>Fever is more typical in norovirus, but you can get a fever with food poisoning as well, depending on what caused it,\u201d says Susan. \u201cFood poisoning more commonly causes your stool to look a different color or have a different texture.\u201d<\/p>\n

How long does stomach flu and food poisoning last?<\/h2>\n

The onset and duration of your symptoms can provide clues to which ailment you are dealing with.<\/p>\n

Onset:<\/strong> Food poisoning typically kicks in anywhere from one hour to three days after consuming contaminated food. For norovirus, symptoms typically appear between 12 to 72 hours after exposure.<\/p>\n

Duration:<\/strong> Food poisoning can last from a few hours to a few days. Most people with norovirus experience at least a 24-hour stomach flu, and some symptoms can last up to three days or longer.<\/p>\n

\u201cThe timing and severity of symptoms are key here,\u201d says Susan. \u201cFood poisoning often hits much sooner, so if you are vomiting and having diarrhea suddenly after eating, it\u2019s likely food poisoning.\u201d<\/p>\n

\"Food<\/a><\/p>\n

Are food poisoning and norovirus contagious?<\/h2>\n

Both food poisoning and norovirus can be contagious, but they spread in different ways.<\/p>\n

\u201cNorovirus is highly contagious and easily spreads through contact with contaminated surfaces or person-to-person contact,\u201d says Susan. \u201cWhile food poisoning isn\u2019t typically considered contagious, there is potential for whatever caused it to spread through contaminated food and drink.\u201d<\/p>\n

Even after you feel better, the stomach flu can still be contagious for several days, so it\u2019s a good idea to stay home for a day or two after symptoms have stopped.<\/p>\n

How to Ease Stomach Cramps and Diarrhea<\/h2>\n

If food poisoning is caused by a bacterial infection, it can be treated with an antibiotic. If you\u2019re facing stomach flu or food poisoning caused by a virus, you\u2019ll have to let it run its course before you\u2019ll feel like your old self again. However, while there is no treatment to cure the stomach flu, there are things you can do to relieve your symptoms.<\/p>\n