The short answer
Some treatments weaken the immune system, making food-borne illness more likely and more serious. Safe food handling — clean, separate, cook, and chill — and avoiding higher-risk foods like raw or undercooked items may help lower the risk.
Some treatments weaken the immune system, raising the risk of food-borne illness.
The basics: clean, separate, cook, and chill.
Avoid raw or undercooked meat, eggs, and seafood, and unpasteurized foods.
Wash hands, produce, and surfaces well, and keep hot foods hot and cold foods cold.
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The simple version
Some cancer treatments make it harder for your body to fight germs. Food safety then matters more than usual, because food-borne illness can hit harder. A few simple habits lower the risk.
The four basics
The core food-safety steps are easy to remember:
- Clean. Wash hands, produce, utensils, and surfaces well.
- Separate. Keep raw meat, poultry, and seafood away from other foods.
- Cook. Cook foods to safe temperatures. A food thermometer helps.
- Chill. Refrigerate leftovers promptly, and keep cold foods cold.
Foods to be careful with
During treatment, it often helps to avoid higher-risk foods:
- Raw or undercooked meat, poultry, eggs, and seafood.
- Unpasteurized milk, juice, and soft cheeses.
- Raw sprouts.
- Foods that are past their date or left out too long.
Ask your care team — precautions depend on your treatment and blood counts.
A note on this page
This information is educational. It is not a substitute for medical advice. For your own care, talk with your doctor, nurse, pharmacist, registered dietitian, or care team.
When to get help sooner
Food poisoning hits harder when treatment has weakened your immune system. Ask your team now what number to call at night and on weekends.
- Call 911 or go to an emergency department if you feel confused or faint, or you have severe belly pain. Do not drive yourself.
- Call 911 or go to an emergency department if you vomit blood or dark material that looks like coffee grounds. MedlinePlus lists this as an emergency. Do not drive yourself.
- Phone your care team immediately, at any hour, if your temperature reaches 100.4°F (38°C) or higher while you are on treatment that lowers your blood counts. CDC warns that a fever during chemotherapy is a medical emergency, and a fever can be the only sign of infection. If you cannot get through quickly, go to an emergency department and tell them at once that you are on chemotherapy.
- Call your care team right away if you cannot keep fluids down, you see blood in your stool, or you are passing very little urine.
- Call your care team right away if you feel weak, dizzy or confused. NCI lists these as signs of dehydration.
- Call your care team within a day or two if vomiting or diarrhea keeps going.
Sources
- FDA — Food Safety for Older Adults and People With Cancer and Other Conditions
- National Cancer Institute — Infection and Neutropenia During Cancer Treatment
- CDC — Neutropenia and Risk for Infection
- CDC — Watch Out for Fever (Preventing Infections in Cancer Patients)
- MedlinePlus — Nausea and vomiting in adults
- National Cancer Institute — Nausea and Vomiting Related to Cancer Treatment
Common questions
Why does food safety matter more during treatment?
Some cancer treatments lower the body's ability to fight germs. That makes food-borne illness (food poisoning) both more likely and potentially more serious. Extra care with food can help lower the risk.
What are the basic food-safety steps?
Four simple habits: Clean (wash hands, produce, and surfaces), Separate (keep raw meats away from other foods), Cook (cook foods to safe temperatures), and Chill (refrigerate promptly and keep cold foods cold).
Which foods should I be careful with?
It often helps to avoid raw or undercooked meat, poultry, eggs, and seafood; unpasteurized milk, juice, and soft cheeses; raw sprouts; and foods past their date. Ask your care team for advice for your situation.
How do I know if I need extra precautions?
Ask your care team, especially if your blood counts are low or you're at higher risk of infection. They can tell you which precautions apply to you and for how long.
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Get urgent help
Fever of 100.4°F (38°C) or higher during chemo, severe pain, or trouble breathing: call your cancer care team right away, day or night. Call 911 for an emergency.
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Last updated: 2026-09-29Next planned review: 2027-07-07
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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