Phantom limb pain is a condition where individuals experience sensations, including pain, in a limb that has been amputated. This phenomenon occurs because the brain continues to receive signals from nerves that originally connected to the missing limb, leading to the perception of pain or discomfort in that area. The exact cause of phantom limb pain is not fully understood, but it is believed to involve changes in the brain and nervous system after amputation. Treatments may include medications, physical therapy, and techniques like mirror therapy, which can help alleviate the sensations associated with this condition.