The short answer
A transplant wipes out and then rebuilds your immune system, and rebuilding takes a long time. MedlinePlus advises taking care not to get infections for up to a year or more afterwards, including avoiding crowds and managing visitors. Fever, chills or sweats after a transplant need a call to your provider.
The precautions exist because the new immune system is not working properly yet.
MedlinePlus advises guarding against infection for up to one year or more after transplant.
NCI says immune recovery takes several months after an autologous transplant and one to two years after an allogeneic or syngeneic transplant.
Avoiding crowds and asking unwell visitors to stay away or mask are part of standard discharge advice.
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The full explanation.
When to get help sooner
Contact your provider straight away if you have trouble breathing at rest or while doing something simple, or a very bad headache or one that will not go away. MedlinePlus lists both among the symptoms a transplant patient should report. If breathing is failing or you cannot rouse someone, that is a 911 call.
Fever, chills or sweats are not a same-day message. MedlinePlus lists them as possible signs of infection, and CDC treats a fever during cancer treatment as a medical emergency, so ring your provider the moment you notice one, at whatever hour it happens. If nobody can be reached quickly, go to an emergency department and say you have had a transplant. Call the same day for redness, swelling or drainage at an IV line site, diarrhoea that will not stop or is bloody, severe nausea or vomiting, inability to eat or drink, extreme weakness, abdominal pain, a new rash or blisters, yellowing of the skin or eyes, a worsening cough, or burning when you pass urine.
Do not wait for the next scheduled clinic visit with these. After a transplant, small signals can mean serious trouble.
What is actually happening inside.
A transplant is more than just a procedure. Before the new stem cells go in, high-dose treatment wipes out the bone marrow. NCI lists a higher risk of infection among the problems this pre-transplant therapy causes.
Then rebuilding starts, and it is slow. NCI puts immune recovery at several months for autologous transplants (using your own stem cells). For allogeneic or syngeneic transplants (using a donor's cells), it takes one to two years. For most of that stretch, your defenses stay below normal, even if you feel fairly well.
These precautions are not about how sick you feel. They are about how much protection you actually have right now.
What the precautions look like at home.
MedlinePlus discharge guidance for transplant patients is practical, not dramatic. Its main instruction: take care not to get infections for up to a year or more after your transplant. Around that sit a set of habits:
- Wash your hands with soap and water often — after going outside, after touching body fluids, after changing diapers, before handling food, after using the phone, after housework, and after the bathroom.
- Stay away from crowds.
- Ask visitors with a cold to wear a mask, or not to visit at all.
- Do not eat or drink anything that may be undercooked or spoiled. Make sure your water is safe.
- Learn how to care for a central line or PICC line, if you have one.
- If you have a cat, keep it indoors. Have someone else change the litter box each day. Avoid rough play, since scratches and bites can get infected.
Mouth care matters too. MedlinePlus advises brushing your teeth and gums two to three times a day, for two to three minutes, with a soft-bristled toothbrush. Rinse four times a day with a salt and baking soda solution. Skip mouth rinses that contain alcohol.
The hospital does not simply let go.
Going home does not mean you are finished. NCI describes going home around 100 days after getting donor stem cells, if there were no problems. After that come hospital visits two or three times a week for close monitoring. Longer term, NCI says you will need follow-up from a doctor experienced with stem cell transplant patients.
Staying active is part of recovery, not the opposite of it. MedlinePlus advises walking and slowly increasing how far you go, based on your energy. Eat enough protein and calories to keep your weight steady.
None of this lasts forever. It is a stretch of time with rules attached, set by how fast your own immune system rebuilds. That is why the actual dates come from your transplant team, not from a webpage.
Words to know
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Common questions
How long do the restrictions last?
MedlinePlus discharge advice says to take care not to get infections for up to one year or more after your transplant. NCI describes immune recovery taking several months for autologous transplants and one to two years for allogeneic or syngeneic transplants. Your own team sets your dates.
Can I have visitors at home?
MedlinePlus does not say no visitors. It says to ask visitors who have a cold to wear a mask, or not to visit. The point is filtering who comes, not living alone.
Why does the hospital follow-up continue for so long?
NCI says that after leaving hospital you still need close monitoring, with hospital visits two or three times a week, and long-term follow-up by a doctor experienced in caring for transplant patients.
Does having a pet mean giving it up?
MedlinePlus does not say that. For cats it advises keeping the cat inside, having someone else change the litter box daily, and not playing rough, because scratches and bites can get infected.
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Sources last checked: 2026-08-11 what this meansLast updated: 2026-08-19Next planned review: 2027-08-11
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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. We do not employ clinicians and do not intend to — our work 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 checked line by line against the sources listed on it. That confirms the sources support what the page says. 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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