after an outbreak of chickenpox usually in childhood the virus that causes it stays in your body lying dormant in certain nerve cells. although your immune system usually keeps the virus in check anything that affects the immune system's ability to hold back the virus -- illnesses immunosuppressive drugs severe stress or aging-related changes for example -- can allow the virus to return with a vengeance. early symptoms of shingles include burning or shooting pain and tingling or itching generally on one side of the body or face. for some people the pain is severe. it may be accompanied by fever chills nausea diarrhea and difficulty urinating. the pain and tingling are followed by a rash which begins with reddish bumps most often on the trunk. in a few days the bumps become fluid-filled blisters which usually crust over and fall off after seven to 10 days. even when the rash goes away the skin color at the rash site may be different. also nerve pain may persist at the site of the rash (a condition called postherpetic neuralgia). about one-fifth of people who get shingles develop postherpetic neuralgia. in most people the pain goes away within four months from the first sign of the rash. shingles is typically easy to diagnose. your health care provider will suspect shingles if you exhibit the typical symptoms of rash on one side of the body along with sharp burning pain and a history of chickenpox.
what are the symptoms of shingles and how is it diagnosed?