Graft-versus-host disease of the skin and gut

Call 911 for sudden shortness of breath that you cannot settle, or for any collapse or severe deterioration. Shortness of breath is one of the symptoms MedlinePlus lists in GVHD, and when breathing becomes difficult quickly it is an emergency rather than a clinic question.

Call your transplant provider the same day if you notice any new GVHD symptom. MedlinePlus is blunt about this: contact your transplant provider right away if you develop any symptoms of GVHD or other unusual symptoms. That includes a new rash, itching or redness of the skin, abdominal pain or cramps, nausea, vomiting, diarrhoea, yellowing of the skin or eyes, or white patches inside the mouth.

You are not being a nuisance by calling. GVHD is treatable, and the team wants to see it early rather than late.

After an allogeneic transplant — one using a donor's stem cells — your new immune system did not grow up in your body. MedlinePlus explains it this way: the new transplanted cells see the recipient's body as foreign, and they attack it. NCI puts the same idea in plainer words. White blood cells from your donor, called the graft, see cells in your body, called the host, as foreign invaders.

The chance of this happening depends partly on how well the donor matches you. MedlinePlus gives rough numbers: about 35 to 45 percent when the donor is a relative, and 60 to 80 percent when the donor is not related to you.

Skin is often the first place people notice a change. MedlinePlus lists rash, itching, and redness in acute GVHD. In chronic GVHD, it describes raised, discolored patches of skin. Skin can also grow tight and thick over time.

The digestive tract brings a different set of complaints. MedlinePlus lists belly pain or cramps, nausea, vomiting, and diarrhea.

Neither list sounds unusual on its own. That is exactly the tricky part. A rash and an upset stomach are things everyone has had before. After a transplant, though, they carry more weight than usual. That is why transplant teams want to hear about them right away, instead of assuming it is nothing.

MedlinePlus tells the two apart by when they start. Acute GVHD shows up within days, or as late as six months after a transplant. Chronic GVHD usually starts more than three months after a transplant, and it can last a lifetime. NCI draws a similar line. It calls acute GVHD the kind that shows up in the first three months, and chronic GVHD the kind that starts three months after transplant or later.

Chronic does not mean untreatable. It means the team manages it over time instead of fixing it in a week.

Doctors do not guess based on symptoms alone. MedlinePlus lists several tests: abdominal X-ray, CT and PET scans, MRI, liver function tests, capsule endoscopy, a liver biopsy, and a biopsy of the skin or the lining of the mouth.

For treatment, MedlinePlus says patients usually get medicines like prednisone, a steroid that suppresses the immune system. Doctors often pair it with newer targeted drugs. This comes with a trade-off worth understanding. An immune system turned down on purpose is also worse at fighting germs. MedlinePlus lists more infections among GVHD's effects.

Day to day, that means the infection precautions your transplant team gave you matter even more while GVHD is being treated, not less. Keep washing your hands, keep up food safety habits, and report fevers exactly as your team told you. Raise any new symptom right away rather than waiting to see if it settles on its own.