HNP stands for Herniated Nucleus Pulposus, a condition in which the jelly-like center of a spinal disc pushes through a crack in the outer layer of the disc, causing pain, numbness, and weakness in the affected area. Some synonyms for HNP include herniated disk, slipped disk, ruptured disk, bulging disk, and prolapsed disk. These terms are used interchangeably to describe the same condition, but the severity and location of the herniation can differ from patient to patient. Some patients may require surgery to alleviate the pain and symptoms associated with HNP, while others may find relief through non-invasive treatments like physical therapy and pain management.