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GVHD explained: when the new immune system attacks | CION Cancer Clinics
Graft-versus-host disease, or GVHD, is when immune cells from a donor's stem cells attack your own body after an allogeneic transplant. It most often affects the skin, gut and liver, and in its longer-lasting form the eyes, mouth, lungs and joints. It is common, often mild, and treatable when reported early. This page explains what it is, what to watch for and what it cannot tell you. At CION Cancer Clinics, our haematology team assesses whether a transplant or CAR-T fits your situation and coordinates care with qualified centres.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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The short answer
What is graft-versus-host disease?
Graft-versus-host disease, or GVHD, happens when the new immune cells from a donor's stem cells treat your own body as foreign and attack it. It only happens after a transplant that uses a donor's cells, called an allogeneic transplant. It does not happen when the cells were your own.
Why the new immune system does this
A donor transplant gives you a new blood and immune system. The donor's white cells arrive trained to guard the donor's body, not yours. Even with a close tissue match, small differences remain between the two of you. Some of the donor cells notice those differences and react. The skin, the gut and the liver are the places they reach first.
Why it is not always bad news
The same donor cells that cause GVHD can also attack any leukaemia or lymphoma cells left behind. Doctors call this the graft-versus-leukaemia effect. This is one reason the transplant team tries to control GVHD rather than switch the donor immune system off completely.
How common is it?
Some degree of GVHD is common after a donor transplant. Many people have a mild form that settles with treatment. A smaller group has a form that lasts longer or is harder to control. Your own risk depends on the donor match, the donor's age and sex, the type of transplant and the medicines used to prevent it.
GVHD is not an infection. You cannot catch it, and you cannot pass it on to family members.Where it shows up
Which parts of the body does GVHD affect?
It can affect one organ or several at once. Each has its own signs, and the signs are often mild at first.
Skin
Often the first sign. A red rash, sometimes itchy, that tends to start on the palms, the soles, the ears or the shoulders. Later it can make the skin dry, darker, thicker or tight.
Gut
Watery loose motions, belly cramps, feeling sick, vomiting and loss of appetite. When the gut is involved, the team takes it seriously, because fluid loss can make you very weak quickly.
Liver
Often found on a blood test before you feel anything. It can cause yellow eyes or skin, dark urine and pale stools as it progresses.
Eyes and mouth
Dry, gritty, burning eyes. A dry mouth, white patches, and soreness with spicy or sour food. These are typical of the longer-lasting form.
Lungs, joints and other areas
Less common, but important to report early.
- A new cough or breathlessness on stairs
- Stiff joints or tight skin over them
- Vaginal dryness or pain
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Signs that need your transplant team the same day
Call your transplant team at once, or go to the nearest emergency department, if you have repeated watery loose motions, blood in the stool, vomiting that stops you keeping fluids down, a rash that is spreading fast or blistering, yellow eyes, or any fever. Take your discharge summary and medicine list with you. Do not stop or change any transplant medicine on your own while you wait.
The pathway
How is GVHD found and treated?
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Prevention starts before the cells go in
Almost everyone having a donor transplant is given medicines to damp down the new immune system in the first months. The aim is to lower the chance of serious GVHD while keeping some of the protective effect against the blood cancer.
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Watching for early signs
Frequent clinic visits and blood tests look for changes in the skin, gut and liver. Your own reports of a new rash or loose motions are just as useful as any test.
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Confirming it is GVHD
Infections and medicine reactions can look the same. The team may test stool samples, repeat blood tests, or take a small skin or gut biopsy, which is a tiny sample of tissue read under a microscope.
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Treatment matched to severity
Mild skin GVHD may need only creams. More widespread GVHD is usually treated with steroid medicines taken by mouth or through a drip. If it does not respond, second-line medicines such as ruxolitinib are considered.
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Slow, careful tapering
Once GVHD settles, medicines are reduced gradually by the team. Going too fast can let it flare again, which is why doses are changed only at clinic visits.
On your discharge papers
What do the words on your transplant notes mean?
- Allogeneic transplant
- A transplant using stem cells from another person, such as a brother, sister, parent or unrelated donor. Only this kind can cause GVHD.
- Acute GVHD
- The earlier, inflammatory form. It mostly affects the skin, gut and liver.
- Chronic GVHD
- The longer-lasting form. It can cause dryness, tightening and scarring in many parts of the body.
- Grade or severity
- A score for how much of the body is affected and how badly. It guides how strong the treatment needs to be.
- Immunosuppression
- Medicines that quieten the immune system. They control GVHD but raise the chance of infection.
- Steroid-refractory
- GVHD that has not settled with steroid medicines, so a different treatment is needed.
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Commonly believed
What do families often get wrong about GVHD?
"GVHD means the transplant has failed."
It does not. GVHD means the donor cells have taken hold and are active. The transplant can be working well against the blood cancer while GVHD is being treated alongside it.
"The rash is only a skin allergy, so we can wait."
After a donor transplant, any new rash should be shown to the transplant team. Early skin GVHD is easier to control than GVHD that has had time to spread to the gut or liver.
"Once the steroids work, we can stop them ourselves."
Stopping steroids suddenly can be dangerous and can bring GVHD back. Only the transplant team should lower the dose, and they do it step by step.
"A perfect donor match means no GVHD."
A fully matched brother or sister lowers the risk, but it does not remove it. Even identical-looking matches differ in small ways that the tests do not measure.
Being straight with you
What can this page not tell you?
This page cannot tell you whether your own symptoms are GVHD. A rash, loose motions or a raised liver test after a transplant has several possible causes. Only the team that knows your transplant, your donor and your medicines can sort out which one it is.
It cannot predict your outlook
How GVHD affects someone over time depends on which organs are involved, how quickly it responds, and how well infections are kept away. Your haematologist can talk you through your own picture. A general page cannot.
Who treatment does not suit in the same way
Strong immune-quietening treatment is harder for people who already have a serious infection, poorly controlled diabetes or weak bones. In those cases the team balances the plan differently, and may choose a gentler or more targeted option.
Where CION fits in
CION does not perform stem cell transplants. Our haematology team can review your reports, discuss your case at a tumour board and help you coordinate follow-up with your transplant centre. Ask your transplant centre who to call out of hours, and keep that number on your phone.
Questions we are asked
Common questions about GVHD
Can GVHD happen after a transplant with my own cells?
No. GVHD needs donor immune cells that see your body as foreign. With an autologous transplant, which uses your own stored cells, this does not happen. A similar-looking inflammation is occasionally seen after an autologous transplant, but it is a different and usually milder condition.
How long after the transplant can GVHD start?
The acute form usually starts in the first few months, often around the time the new cells begin to grow. The chronic form usually appears later and can start months or even years after the transplant. Either form can also appear when immune-quietening medicines are being reduced, so stay alert during tapering.
Is GVHD dangerous?
Mild GVHD is common and often settles well. Severe GVHD, especially in the gut or liver, is a serious condition that needs hospital care. The treatment itself also raises the risk of infection. That is why early reporting matters so much: it gives the team the strongest chance to act while it is still mild.
Will I need to stay in hospital?
Not always. Mild skin GVHD is often managed at clinic visits with creams and close follow-up. Severe gut GVHD, heavy fluid loss or GVHD needing medicines through a drip usually means a hospital stay. Your team decides based on how unwell you are and how easily you can reach them.
Can we reduce the chance of GVHD at home?
Take every transplant medicine exactly as prescribed and never skip a dose. Keep your clinic appointments and blood tests. Protect your skin from strong sun, because sunlight can trigger skin GVHD. Report new symptoms early rather than waiting to see whether they pass.
Does GVHD mean the leukaemia is coming back?
No. GVHD and relapse are separate things. In fact, some GVHD is linked with a stronger effect of the donor cells against leukaemia. Relapse is checked with blood tests, bone marrow tests and sometimes scans, not by the presence or absence of GVHD.
Can my diet make GVHD worse?
Food does not cause GVHD. But if the gut is affected, some foods can make loose motions worse, and the team may suggest a simpler diet for a while. Food safety also matters while your immune system is weak, so follow the food advice your transplant centre gave you.
Who should we speak to about GVHD in Hyderabad?
Your transplant centre stays the first call for urgent symptoms. For a review of reports, a second opinion or help coordinating care closer to home, CION's haematologist, Dr. Basudev Pokhrel, and the haematology team can look at your case and help you plan the next conversation with your transplant team.
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Sources
- NHS — Stem cell and bone marrow transplants
- National Cancer Institute — Stem Cell Transplants in Cancer Treatment
- Cancer.Net — Graft-Versus-Host Disease
- Leukemia & Lymphoma Society — Graft-Versus-Host Disease
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Acute vs Chronic GVHDHow the two forms differ in timing, signs and treatmentSkin GVHD: Rash, Grading and TreatmentOften the first sign, and what the grading meansGut GVHD: Diarrhoea and When It Is SeriousWhen loose motions after transplant need same-day careSteroids for GVHD and Their Side EffectsThe usual first treatment and what to watch forGraft-versus-Host DiseaseEvery GVHD guide in one place
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