Can I Eat Oysters When Pregnant?

Can you eat oysters when pregnant? The short answer: avoid raw oysters during pregnancy. Cooked oysters are generally considered safer, but raw oysters carry a significant risk of food poisoning that makes them best avoided entirely while you are expecting.

Quick Answer

Oysters in pregnancy: avoid raw; cooked is lower risk

Raw oysters are not recommended during pregnancy because they can harbour harmful bacteria and viruses that are particularly risky when your immune system is naturally suppressed. If oysters are thoroughly cooked, the risk is much lower — but raw or lightly cooked oysters should be off the menu.

Why Raw Oysters Are Risky in Pregnancy

Vibrio bacteria — Vibrio infections cause severe gastroenteritis, and pregnant people are more vulnerable to serious illness than the general population. Vibrio is killed by thorough cooking.

Norovirus — Raw shellfish, especially oysters, are a well-known source of norovirus. Severe vomiting and diarrhoea from norovirus can lead to dehydration, which is particularly unpleasant and potentially harmful in pregnancy.

Listeria — Listeria monocytogenes can occasionally be found in raw shellfish. Listeria infection during pregnancy can cause serious complications including miscarriage, premature birth, and severe illness in newborns. It is the reason raw shellfish and certain other foods are specifically flagged as risks during pregnancy.

Hepatitis A — Though less common, raw oysters and shellfish can carry hepatitis A. Pregnancy does not increase susceptibility, but the infection can be serious.

NHS Guidance on Oysters

Cooked shellfish, where the oyster is heated all the way through until steaming hot, is a lower-risk option. However, many restaurants serve oysters raw or very lightly grilled, so it is worth being specific about how they are prepared if you are eating out.

How to Enjoy Shellfish Safely in Pregnancy

• Thoroughly cooked prawns, mussels, clams, and scallops — as long as they are piping hot all the way through, these are safe to eat.
• Cooked crab and lobster — fine when fully cooked and served hot.
• Avoid any shellfish that smells off, has cracked shells, or has not opened during cooking — these should always be discarded.

Shellfish is a useful source of protein, zinc, and iodine, so it does not need to be avoided completely — just make sure anything you eat has been properly cooked.

Frequently Asked Questions

Try not to panic. A single exposure to raw oysters does not mean you will definitely become ill. Watch for symptoms such as nausea, vomiting, diarrhoea, stomach cramps, or fever in the hours and days following. If you develop a high temperature or feel very unwell, contact your GP or call 111 so they can assess you. Mention that you are pregnant so they can prioritise appropriately.

Are cooked oysters safe in pregnancy?

Oysters that are cooked thoroughly — steamed, baked, or fried until they are piping hot all the way through — are at much lower risk than raw oysters. The cooking process kills the bacteria and viruses that make raw oysters risky. If you are at a restaurant, check how they are prepared before ordering.

Can I eat other shellfish when pregnant?

Yes, provided they are fully cooked. Prawns, mussels, scallops, crab, and lobster are all fine to eat during pregnancy when they have been cooked all the way through. The key rule is to avoid anything raw or undercooked, and to make sure shellfish is served piping hot rather than warm.

Always speak to your midwife or GP for personal advice about food safety in pregnancy.

Last reviewed: June 2026

Related articles:

• Foods to Avoid in Pregnancy
• Pregnancy Vitamins
• Healthy Diet in Pregnancy