Sciatica is pain down the back of the legs.
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Olivia Newton-John has been forced to postpone a number of concerts due to a "bad issue" with her health.
The announcement was made on the Grease star's official Facebook page on Tuesday May 10.
"We are so sorry to announce that the Olivia concerts scheduled for May will be postponed due to a bad issue with Olivia's sciatica," the 68-year-old's management wrote.
"Once the dates are rescheduled we will post the new dates ASAP. Apologies for any inconvenience."
Sciatica is pain down the back of the legs.
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