Justin Bieber and Dianne Feinstein got shingles. What causes it?

Pop star Justin Bieber, 29, and Dianne Feinstein, the 89-year-old Senate Democrat from California, have both recently reported health issues related to a shingles outbreak.

Shingles is a painful and sometimes debilitating condition that can last for weeks or months. Feinstein, the oldest U.S. senator, was hospitalized this month after being diagnosed with shingles. She has since returned home. Bieber announced in June that he was delaying his international tour because of facial paralysis related to a shingles outbreak, a condition called Ramsay Hunt syndrome. He canceled the tour last week.

We answered common questions about shingles, the symptoms and getting vaccinated.

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