How do I know if it's food poisoning or a stomach bug?

Food poisoning typically causes sudden symptoms within hours of eating a specific food, while a stomach virus (stomach flu) often comes with a more gradual onset and may spread to others in close contact — both usually resolve within a few days.

When should chronic diarrhea be evaluated by a doctor?

Symptoms recurring over weeks or months, rather than resolving within a few days, warrant a doctor's evaluation to rule out conditions like IBS, IBD, or celiac disease.

Do probiotics actually help with diarrhea?

Probiotics may help restore healthy gut bacteria balance after a digestive upset, though evidence varies by strain and individual, and they work best alongside — not instead of — addressing the underlying cause.

375 million cases in the US yearly →

Acute or chronic? Find your likely cause.

Diarrhea can stem from a passing stomach bug or a longer-term digestive condition. Answer a few questions to understand which category fits your situation and the appropriate next step.

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375Mcases occur in the US yearly

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2main categories: acute vs. chronic

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Everything about digestive health, organized properly

From identifying your cause to prevention and gut health support.

🔍

Acute vs. Chronic

Identify your likely category.

✈️

Traveler's Diarrhea

Prevention before your trip.

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Food Poisoning vs. Stomach Flu

Telling them apart.

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The BRAT Diet

What to eat during recovery.

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IBS & Chronic Causes

When symptoms persist long-term.

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Probiotics & Gut Health

Supporting recovery and prevention.

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Diarrhea Cause Identifier

Answer a few questions to understand whether your symptoms point toward an acute or chronic cause.

When did symptoms start?

How long have symptoms lasted?

Your likely category

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The essentials

375 million cases a year — mostly harmless, but not always

With an estimated 375 million cases occurring in the US annually, digestive upset is one of the most universally experienced health issues — though distinguishing a passing bug from a longer-term condition matters for getting the right care.

Timing is the most useful clue

Sudden onset after a specific meal points toward food poisoning, while gradual, recurring symptoms over weeks point toward a chronic condition worth evaluating.

Most acute cases resolve on their own

Hydration and bland foods are usually sufficient for typical food poisoning or stomach bugs, without needing medical intervention.

Chronic patterns deserve proper evaluation

Recurring symptoms over an extended period shouldn't be dismissed as 'just a sensitive stomach' without ruling out treatable conditions like IBS or celiac disease.

Key takeaway

The timing and duration of digestive symptoms are the most useful clues for distinguishing a passing acute issue from a chronic condition that deserves proper medical evaluation.

Helpful next steps

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This content is for general educational purposes only and is not a substitute for personalized medical advice. See a doctor if symptoms are severe, include blood, or last more than a few days.

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The Digestive Health and Diarrhea Guide

A free PDF covering acute vs. chronic causes, traveler's prevention, the BRAT diet, and probiotic support.

Acute vs. chronic diarrhea, explained clearly
Traveler's diarrhea prevention before your trip
Food poisoning vs. stomach flu, told apart
The BRAT diet and when to use it
IBS and other chronic causes worth ruling out