Symptoms

Symptoms of food poisoning vary with the source of contamination. They may include:

• Diarrhea, which may be bloody.
• Nausea.
• Belly pain.
• Vomiting.
• Dehydration.
• Low-grade fever (sometimes).

If you are very dehydrated, you might notice:

• Feeling lightheaded or faint, especially when you stand up.
• Fatigue.
• Dark-colored urine.
• Less frequent urination.
• Extreme thirst.

Whether you become ill after eating contaminated food depends on the organism, the amount of exposure, your age and your health.