Experts don't know exactly how many people get shingles more than once. They do know it comes back more often in people with weakened immune systems.
If your immune system is healthy:
In the first several years, your chances of having shingles again are lower than it is for people who have never had shingles.
Over time, your chances of a second bout go up. One study found that within 7 years, the odds of getting it again may be almost 5%. That's about the same as the odds of getting shingles the first time.