Here's How Your Body Reacts To Food Poisoning

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Symptoms
Food poisoning symptoms vary with the source of contamination. Most types of food poisoning cause one or more of the following signs and symptoms:

• Nausea
• Vomiting
• Watery or bloody diarrhea
• Abdominal pain and cramps
• Fever

Signs and symptoms may start within hours after eating the contaminated food, or they may begin days or even weeks later. Sickness caused by food poisoning generally lasts from a few hours to several days.

When to see a doctor
If you experience any of the following signs or symptoms, seek medical attention.

• Frequent episodes of vomiting and inability to keep liquids down
• Bloody vomit or stools
• Diarrhea for more than three days
• Extreme pain or severe abdominal cramping
• An oral temperature higher than 100.4 F (38 C)
• Signs or symptoms of dehydration — excessive thirst, dry mouth, little or no urination, severe weakness, dizziness, or lightheadedness
• Neurological symptoms such as blurry vision, muscle weakness and tingling in the arms

Causes
Contamination of food can happen at any point of production: growing, harvesting, processing, storing, shipping or preparing. Cross-contamination — the transfer of harmful organisms from one surface to another — is often the cause. This is especially troublesome for raw, ready-to-eat foods, such as salads or other produce. Because these foods aren't cooked, harmful organisms aren't destroyed before eating and can cause food poisoning.

Many bacterial, viral or parasitic agents cause food poisoning. The following table shows some of the possible contaminants, when you might start to feel symptoms and common ways the organism is spread.