BID is a rare, infrequently studied condition in which there is a mismatch between the mental<unk>  image and the physical<unk> , characterized by an intense desire for amputation or paralysis of a limb, usually a leg, or to become blind or deaf. The person sometimes has a sense of sexual arousal connected with the desire for loss of a limb, movement, or sense. Some act out their desires, by pretending they are amputees using prostheses and other tools to ease their desire to be one, by using a wheelchair or by pretending they are blind or deaf. Some people with BID have reported to the media or by interview with researchers that they have resorted to self-amputation of a "superfluous" limb by, for example, allowing a train to run over it or otherwise damaging it so severely that surgeons will have to amputate it. However, the medical literature records few, if any, cases of self-amputation. There has been, however, at least one apparently well-documented example. To the extent that generalizations can be made, people with BID appear to start to wish for amputation when they are young, between eight and twelve years of age, and often knew a person with an amputated limb when they were children; however, people with BID tend to seek treatment only when they are much older. People with BID seem to be predominantly male, and while there is no evidence that sexual preference is relevant, there does seem to be a correlation with BID and a person having a paraphilia; there appears to be a weak correlation with personality disorders. Family psychiatric history does not appear to be relevant, and there does not appear to be any strong correlation with the site of the limb or limbs that the person wishes they did not have, nor with any past trauma to the undesired limb.
Body integrity dysphoria
Gender dysphoria
Emotional lability
Morbid love
Sexual anhedonia
Emotional detachment
Automatism 
Body image disturbance