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Food poisoning, also called foodborne illness, is a sickness caused by eating or drinking something contaminated with germs or other harmful substances. Mayo Clinic says food poisoning is a type of foodborne illness caused by something you ate or drank, and NIDDK defines it as an infection or irritation of the digestive tract spread through foods or drinks.

This matters because food poisoning is not always 'just a sensitive stomach.' Most people recover without treatment, but some cases can lead to serious complications, especially dehydration. NIDDK says dehydration is the most common complication.

Food poisoning is not one single disease. It is a general term for illness caused by contaminated food or drink. Mayo Clinic says symptoms often begin within hours or days after eating the contaminated food, but the exact timing depends on the cause.

CDC says food poisoning symptoms include: diarrhea; stomach pain or cramps; nausea; vomiting; fever. Mayo Clinic says symptoms often include upset stomach, loose stools, and vomiting. NHS says food poisoning commonly causes diarrhea, vomiting, stomach pain, and a high temperature.

NHS says these can usually be treated at home in mild cases, but replacing fluids is very important. NIDDK says replacing lost fluids and electrolytes is the most important treatment. Food poisoning often becomes dangerous not because of the infection itself, but because the body loses too much fluid.

A mild upset stomach may pass quickly and may not involve ongoing vomiting, diarrhea, fever, or dehydration. Food poisoning is more likely to cause a cluster of symptoms: repeated vomiting; diarrhea; stomach cramps; fever; feeling generally unwell. Another clue is timing — symptoms often begin within hours or days after eating contaminated food.

NIDDK says dehydration is the most common complication. CDC says signs of dehydration include: not urinating much; a dry mouth and throat; feeling dizzy when standing up. NIDDK adds symptoms such as thirst, dry mouth, urinating less than usual, and low energy.

CDC says to see a doctor if symptoms are severe, including: bloody diarrhea; diarrhea lasting more than 3 days; high fever over 102°F (39°C); vomiting so often that liquids cannot be kept down; signs of dehydration. Mayo Clinic also says emergency help is needed for severe belly pain or watery diarrhea that becomes very bloody within 24 hours.

CDC says children younger than 5 are at increased risk. Mayo Clinic lists other high-risk groups: older adults; infants and young children; pregnant people; people with ongoing conditions; people with weakened immune systems. The same illness that is mild in one person may be much more dangerous in another.

'It's just a stomach bug, so fluids don't matter much.' Not true. NIDDK says replacing lost fluids and electrolytes is the most important treatment.

'If I can still sit at home, it can't be serious.' Not necessarily. CDC says food poisoning needs medical help if there is bloody diarrhea, dehydration, high fever, or vomiting that prevents fluid intake.

'If it's food poisoning, it always starts immediately after eating.' Not always. Symptoms can start within hours or days, depending on the cause.

'It's only dangerous if someone passes out.' False. Dehydration can become serious before collapse happens.

Food poisoning is a foodborne illness caused by contaminated food or drink. Official sources from CDC, NHS, NIDDK, and Mayo Clinic all show the same core pattern: common symptoms include diarrhea, vomiting, stomach cramps, nausea, and sometimes fever, and the biggest complication is dehydration.

The safest bottom line is simple: food poisoning is often mild, but once dehydration or severe symptoms appear, it should not be treated like 'just an upset stomach.'

*This article is for informational purposes only and does not replace professional medical advice. Always consult a healthcare provider for food poisoning assessment and treatment.*