Symptoms of Food Poisoning With Oysters

Oysters entree

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According to the Food Borne Illness website, "Shellfish (oysters, clams, mussels) pose the greatest risk and any particular serving may be contaminated; there is no way to distinguish a contaminated oyster from a safe oyster." Oysters can harbor several different types of bacteria and viruses, each with a range of symptoms.


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Frequent, watery stools are common with oyster food poisoning. Excessive watery bowel movements indicate an infection of some kind, and that nutrients and water are not being absorbed.


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Oyster food poisoning may involve regurgitation, but not always. Vomiting accompanied with diarrhea is a good indication of infection, but not specifically food poisoning.

Nausea/Abdominal Pain/Cramps

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Oyster food poisoning may make the affected individual feel queasy or experience vague abdominal pain and cramps. These symptoms are usually accompanied by diarrhea and vomiting.


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Oyster food poisoning leads to malabsorption of nutrients in the bowels, which leads to weakness and fatigue. Look for signs of low energy levels, including the need for increased sleep.


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Headaches may occur as a result of dehydration from the lack of water being absorbed by the body. Headaches may feel throbbing or hammering, or a dull pain in some cases.


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In the case of Hepatitis A or Norwalk virus food poisoning, the infected individual may experience a sudden or slow onset of fever. If fever is expected, take a temperature reading with an oral thermometer to confirm.