It is possible to feel sensations like pain, cramps, heat, cold and tingling in the area where a cut off limb used to be. This is because the brain still thinks the limb is present.
This phenomenon is known as Phantom Limb Pain (PLP). Although the cause is not completely known, it is believed to be due misfiring of signals from the brain or the spinal cord. Despite the absence of the amputated limb, the original “limb neural network” still exists inside the brain. The brain actively remaps the arm on to the shoulder and face due to its adaptability.