Laura Meckler reports on the presidential race.

Sen. John McCain is releasing his long-awaited medical records Friday, and while he told reporters last week not to expect any surprises, any discussion of his health is politically treacherous for the 71-year-old presidential candidate.

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John McCain smiles Sunday, May 18, 2008, a day after he appeared on “Saturday Night Live” and poked fun at his age. McCain will release his medical records Friday. (Associated Press)

McCain said he wishes the campaign had released the records already, and aides blamed scheduling conflicts for the delay. Others suspected that the release, on a Friday before a holiday weekend, was timed to generate minimal attention.

Either way, the records are coming out. McCain’s most serious medical issue was surgery for melanoma—a sometimes fatal form of skin cancer–in August 2000.

McCain told reporters on his bus last week that he was in good health. “There will be no surprises,” with the records release, he said. He said he has talked to his doctors, including an oncologist who he sees every three months. “They’ve told me that everything is fine.”

He added that he understands the interest in the subject.

“It is still six months before the election, but I understand the desire for people to see them as quickly as possible,” he said.

McCain was held for 5½ years as a prisoner of war in Vietnam, during which he was tortured. Injuries sustained from that period still prevent him from raising his arms fully.