Postherpetic Neuralgia (PHN) is a painful condition that can occur after an outbreak of shingles, which is caused by the reactivation of the varicella-zoster virus. PHN is characterized by persistent, burning, or stabbing pain in the area where the shingles rash was present, even after the rash has healed. This pain can be severe and long-lasting, often impacting daily activities and quality of life. Early treatment of shingles can help reduce the risk of developing PHN.