The same virus that causes chickenpox (varicella) can recur in the form of shingles (herpes zostra) later in life. Shingles presents as a rash or blisters, often on one side of your torso, along with burning or shooting pain, fever, headache, and/or nausea.
Causes
The most common cause, as previously mentioned, is earlier exposure to the same virus that causes chickenpox. The virus retreats to the nerves near your spinal cord and brain after the chickenpox fade, waiting for a time when your immune system is compromised, either due to extreme stress, medication, or chemotherapy. However, you may also experience shingles without these secondary causes.