Shingles, also called herpes zoster, is more common in people with weakened immune systems. Women over the age of 50 are more likely to get shingles more than once. After a person has shingles for the first time, the chances of getting it again within the first few years are extremely low. However, as time goes on, the person's chance of developing shingles again goes up. People who experienced severe symptoms for more than 30 days also have a higher chance of repeat infections.