In cases where someone has suffered an injury that requires amputation, patients may for years, experience sensations seeming to come from the...

In cases where someone has suffered an injury that requires amputation, patients may for years, experience sensations seeming to come from the missing limb. It is not unusual for such people to have difficulty adjusting as their brain adapts. Sometimes patients will even feel pain in parts of the missing limb.

What is this pain sensation called? What is happening that the person continues to perceive pain in a limb no longer there? What are the treatments for this condition?