Postherpetic Neuralgia (PHN) is a painful condition that occurs after shingles, a viral infection caused by the varicella-zoster virus. Shingles results in a painful rash and blisters, which usually go away within a few weeks. However, for some people, the pain can persist even after the rash has disappeared, and this is known as postherpetic … Continue reading Postherpetic Neuralgia: An Overview