Shingles are caused by the same virus that also causes chickenpox. This explains why this may also be called herpes zoster but do remember that it should not be confused with herpes, which is a sexually transmitted disease. The virus that causes herpes is different. Some people assume that the blisters that they have are caused by shingles only to realize that the blisters are caused by herpes.
It will be advisable for people to get themselves checked immediately if they suspect that they may have shingles or herpes so that the doctor can accurately diagnose it. The right treatment will make a huge difference.