Herpes zoster, commonly known as shingles, is a condition where early treatment is absolutely crucial. Caused by the reactivation of the varicella-zoster virus—the same virus responsible for chickenpox—shingles often begins quietly. Many people first notice tingling, burning, itching, or sharp pain on one side of the body or face days before a rash appears. Because these early symptoms can feel vague or unrelated, the disease is frequently overlooked during its most treatable stage.