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When the virus that causes chickenpox reactivates, it causes shingles. Early symptoms of shingles include headache, sensitivity to light, and flu-like symptoms without a fever. You may then feel itching, tingling, or pain where a band, strip, or small area of rash may appear several days or weeks later. A rash can appear anywhere on the body but will be on only one side of the body, the left or right. The rash will first form blisters, then scab over, and finally clear up over a few weeks. This band of pain and rash is the clearest sign of shingles.
The rash caused by shingles is more painful than itchy. The nerve roots that supply sensation to your skin run in pathways on each side of your body. When the virus becomes reactivated, it travels up the nerve roots to the area of skin supplied by those specific nerve roots. This is why the rash can wrap around either the left or right side of your body, usually from the middle of your back toward your chest. It can also appear on your face around one eye. It is possible to have more than one area of rash on your body.
Shingles develops in stages:
Prodromal stage (before the rash appears)
Active stage (rash and blisters appear)
Postherpetic neuralgia (chronic pain stage)
Shingles may be confused with other conditions that cause similar symptoms. The rash from shingles may be mistaken for an infection from herpes simplex virus (HSV), poison oak or ivy, impetigo, or scabies. The pain from PHN may feel like appendicitis, a heart attack, ulcers, or migraine headaches.
eMedicineHealth Medical Reference from Healthwise
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