Where Is the Line? When Medicine Alters a Healthy Body

Doctors alter healthy bodies all the time. Cosmetic surgery can change a healthy nose, breast, face or abdomen even when nothing is physically wrong. So if altering healthy tissue can be acceptable medicine, where does medicine draw the line?Doc G and the Discussants put that principle to the test. What happens when a competent adult with Body Integrity Dysphoria asks a surgeon to remove a perfectly healthy limb? If autonomy, psychological suffering and informed consent can justify one irreversible procedure, why not another? And when should a physician's judgment override what a patient says he or she wants?Then comes the harder comparison: cosmetic surgery, healthy-limb amputation and medical intervention affecting healthy sex characteristics or normal development in a minor. They are not the same conditions or procedures—but they expose the same underlying questions about autonomy, evidence, psychological distress, consent and irreversible harm.If medicine can alter a healthy body in one case but refuses in another, what coherent principle explains where the line belongs?