Nausea
Vomiting
Diarrhea
Stomach cramps
Abdominal pain
Fever
Chills
Weakness
Headache
Loss of appetite
Signs starting within hours to a few days after eating
Multiple people getting sick after eating the same food
Blood in stool
Severe dehydration
Dry mouth
Dizziness
Dark urine
Little or no urination
Confusion
Trouble keeping fluids down
Symptoms lasting more than a few days