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Bret Michaels undergoes kidney surgery

Bret Michaels performs at the Sing For Your Supper Campaign Launch at Hard Rock Cafe New York on April 15, 2014, in New York.

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Bret Michaels is recovering from kidney surgery.

Michaels' guitarist Pete Evick says the 51-year-old rocker has been in and out of six hospitals over the past two weeks and underwent kidney surgery last week.

Evick says Michaels' latest kidney issues stem from several medical problems, including a May incident in which the former Poison frontman was rushed off stage in Manchester, New Hampshire, for what Evick described as the flu and severely low blood sugar.

The singer was diagnosed with diabetes as a child. During his first stint on "The Celebrity Apprentice" Michaels helped raise money for the American Diabetes Association.

In 2009, Michaels, 51, was struck in the head with a set piece while at the Tony Awards, causing a brain hemorrhage. He suffered injuries that he said contributed to a brain hemorrhage that nearly killed him.

Evick says Michaels is expected to return to the stage Thursday in Florida.