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Four problems that turn up years later and are easy to miss because each belongs to a different specialty: bone that thins or, less often, dies at the hip; cataract, which is common after total body irradiation and is fixed by an operation; kidney function that drifts down; and lungs that stiffen rather than obstruct. Each has a cheap test.

Chronic GvHD is a pattern of injuries that can appear in several places at once: skin that thickens, a dry sore mouth, dry painful eyes, difficulty swallowing, abnormal liver tests, stiff joints, genital narrowing. Several of the best treatments are local rather than systemic. The eye and genital problems are the ones least often raised.