Attacks can range from mild to very severe, and from surprisingly short to persistent. The term may be used until a specific cause has been determined. Causes for attacks include bacteria, viruses, parasites, and poisonous substances. Food poisoning usually involves food that has not been properly handled and contains bacteria. The onset of the disease is often sudden and dramatic.
Most cases resolve on their own.
A possible effect of diarrhea or vomiting is dehydration. This is excessive loss of body water. The highest risk is for children and the elderly. Seek medical attention if diarrhea or vomiting last for more than 24 hours. Call your healthcare provider if there is high fever or if you vomit blood or material that looks like coffee grounds.