A peripheral nerve injury occurs when any nerves in the body that are not in the brain or spinal cord are damaged. If a peripheral nerve is damaged then muscles supplied by that nerve do not receive information from the brain and, therefore, they become weakened or paralysed. The nerve damage also means that the brain does not receive information from the body. This can present as altered sensation such as numbness or pins and needles. Unlike the spinal cord, peripheral nerves have the ability to heal.