Health Library

Food poisoning is a disease that is carried or transmitted to humans by contaminated foods or beverages.

Gastrointestinal System

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Food poisoning is caused by substances in foods or beverages, including:

• Bacteria
• Poisons produced by bacteria
• Viruses
• Amoeba or parasites
• Chemicals

Factors that increase your chances of getting food poisoning include:

• Poor hygiene
• Poor refrigeration
• Lack of knowledge of safe food preparation
• Weakened immune system, including during pregnancy
• Age: infants and elderly

After you consume the contaminated food or beverage, there is a delay before symptoms arise. This delay is called an incubation period. It can last hours or weeks. Symptoms include:

• Nausea and vomiting
• Diarrhea
• Stomach pain
• Dehydration—if vomiting or diarrhea is severe
• Neurologic symptoms, including headache, lightheadedness, visual disturbances, and seizures
• Poor urine output
• Cramps
• Bloody stools, bloody vomit
• Fever, chills
• Muscle aches and pains
• Weakness

The doctor will ask about your symptoms and medical history. A physical exam will be done. You may be asked to provide a sample of your stool or vomit for testing. If you have some of the food that you think made you sick, you may be asked to bring it in to be tested. Blood tests may be done to asses kidney function, blood salts and acid-base balance, and the presence of a blood infection. A urinalysis may also be performed.

Most types of food poisoning improve in 12-48 hours. There aren't many treatments available to speed your recovery from food poisoning.

Treatments include:

If you are diagnosed with food poisoning, follow your doctor's instructions .

To help prevent food poisoning:

• Only eat and drink milk products that are pasteurized.
• Wash your hands thoroughly before touching food.
• Cook foods thoroughly.
• Always rinse fresh fruits and vegetables before eating them. Peel away any skin or rind.
• Be particularly careful when preparing chicken.
• Never put cooked meat on a surface that previously had raw meat on it.
• Use separate cutting boards for meat and other foods.
• Don't prepare any recipes that use raw egg. You can use powdered egg products in place of a fresh egg.
• Don't eat food that has been outside a refrigerator for more than two hours, or one hour in very hot weather.
• Set your refrigerator temperature to below 40°F (4ºC).
• If you can your own food, follow sterilization directions carefully.
• If you have a weakened immune system or are pregnant, don't eat raw shellfish, rare meat, or unpasteurized dairy products.
• If you are traveling:
  • Drink bottled water, not tap water.
  • Don't order drinks with ice.
  • Eat cooked fruits and vegetables instead of raw ones.
  • Don't eat food from street vendors.