Shingles is caused by the varicella zoster virus, which also causes chickenpox. After having chickenpox, the virus remains dormant in the nerves and can reactivate later in life as shingles. Shingles most commonly affects adults over 50 and causes a burning sensation and rash in a band-like pattern on one side of the body. While shingles itself is not contagious, someone without prior chickenpox exposure could contract chickenpox from a shingles patient. Treatments aim to relieve pain and shorten the 2-5 week duration of symptoms.