Shingles or herpes zoster, a condition characterized by a painful, blistered rash that can last for 2 to 4 weeks. In some cases, the pain may even last for years after the rash has disappeared. This condition is called postherpetic neuralgia (PHN). It is the most common complication of shingles. The risk of shingles and PHN increases with age. Shingles usually cause pain that is described as agonizing, burning, stinging, aching, and shocking. The pain, sometimes compared to the pain of labor, can lead to depression, difficulty concentrating, anxiety, loss of appetite and weight loss. The condition may interfere with a person's ability to perform normal activities such as dressing, eating, cooking, bathing, shopping and traveling. Shingles can lead to several serious complications, from which eye complications can lead to vision loss. Learn more about shingles in this video.