How many people have biid?
Nobody knows. It is certainly a rare and unusual condition, yet at this point there is no way to tell. One of the problems is that as the condition is unknown, people don't realise they have it.
Studies by neuroscientists and stories from 'around the traps' suggest a similar aetiology to Gender Identity Disorder and this may suggest the numbers may be similar. If this is so, the number suffering from BIID may be similar to those who seek sexual reassignment.
Dr. First suggests there may be only a few thousand people worldwide suffering from body integrity identity disorder.