Sen. Bernie Sanders, I-Vt., is "in good health" and "more than fit enough" to be president, his doctors said in letters made public Monday.
"At this point, I see no reason he cannot continue campaigning without limitation and, should he be elected, I am confident he has the mental and physical stamina to fully undertake the rigors of the Presidency," cardiologist Martin LeWinter said in one of the letters released by the Sanders campaign.
Another letter came from Dr. Brian Monahan, who said Sanders has been seen by his medical office for 29 years.
"You have no history of tobacco use, exercise regularly, and seldom drink alcohol," he wrote.
"You are in good health currently and you have been engaging vigorously in the rigors of your campaign, travel, and other scheduled activities without any limitation," he added.
Bernie Sanders and wife, Jane
Bernie Sanders and wife, Jane
Former Democratic U.S. presidential candidate Senator Bernie Sanders hugs his wife Jane after making a motion to suspend the rules and nominate Hillary Clinton as the Demcoratic presidential nominee at the Democratic National Convention in Philadelphia, Pennsylvania, U.S. July 26, 2016. REUTERS/Carlos Barria
U.S. Democratic presidential candidate Bernie Sanders gets a kiss from his wife Jane as he addresses supporters following the closing of the polls in the California presidential primary in Santa Monica, California, U.S., June 7, 2016. REUTERS/Lucy Nicholson
U.S. Democratic presidential candidate Bernie Sanders and his wife Jane wave to the audience during a rally in Vallejo, California, May 18, 2016. REUTERS/Stephen Lam
PORTSMOUTH, NH - With Jane Sanders, Democratic Presumptive Nominee for President former Secretary of State Hillary Clinton attends a rally with Senator Bernie Sanders (I-VT) at Portsmouth High School Gymnasium in Portsmouth, New Hampshire on Tuesday, July 12, 2016. (Photo by Melina Mara/The Washington Post via Getty Images)
Jane O'Meara Sanders walks on the floor during the third day of the Democratic National Convention at the Wells Fargo Center, July 27, 2016 in Philadelphia, Pennsylvania. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
Democratic U.S. presidential candidate Bernie Sanders kisses his wife, Jane O'Meara Sanders, at a rally in Hollywood, Los Angeles, California, United States October 14, 2015. REUTERS/Lucy Nicholson
U.S. Democratic presidential candidate Bernie Sanders (C) hugs his wife Jane Sanders (L) while actress Susan Sarandon surveys the overflow room at a campaign rally in Fairfield, Iowa January 28, 2016. REUTERS/Mark Kauzlarich
U.S. Democratic presidential candidate Bernie Sanders' wife Jane (R) waves to the crowd as Sanders acknowledges her and his step daughters Carina (L) and Heather (C) as Sanders addresses his final campaign rally before the Iowa Caucus at Grand View University in Des Moines, Iowa January 31, 2016. REUTERS/Jim Bourg
Jane Sanders, wife of Vermont Senator and 2016 Democratic presidential candidate Bernie Sanders, listens during an interview following a campaign event in Fort Madison, Iowa, U.S., on Friday, Jan. 29, 2016. In advance of Monday's Iowa caucuses, the first electoral contest of the presidential primaries, Jane Sanders has ventured out often on her own, sometimes with multiple events the same day. Photographer: T.J. Kirkpatrick/Bloomberg via Getty Images
Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, walks with his wife Jane Sanders ahead of the Jefferson-Jackson Dinner in Des Moines, Iowa, U.S., on Saturday, Oct. 24, 2015. With Vice President Joe Biden officially out of the presidential race, the nation's first nominating contest between front-runner Hillary Clinton and Sanders is gaining steam, according to a new Bloomberg Politics/Des Moines Register Iowa Poll. Photographer: Daniel Acker/Bloomberg via Getty Images
FLORENCE, SOUTH CAROLINA - SEPTEMBER 12: With his wife Jane O'Meara, Vermont Senator Bernie Sanders (I-VT) prepares to speak at a Florence Town Hall Meeting in an arena in Florence, South Carolina on Saturday September 12, 2015. (Photo by Melina Mara/The Washington Post via Getty Images)
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Sanders, 78, also underwent a treadmill exam earlier this month, the doctors said.
"Mr. Sanders was able to exercise to a level that is approximately 50% higher than other men his age with a similar diagnosis," Dr. Philip A. Ades wrote in his letter. "Mr. Sanders is more than fit enough to pursue vigorous activities and an occupation that requires stamina and an ability to handle a great deal of stress."
The Vermont senator underwent heart surgery in October after suffering chest pains at a campaign stop in Nevada.
One of Sanders' chief rivals in the Democratic race, former Vice President Joe Biden, released a letter from his doctor earlier this month. That doctor, Kevin O'Connor, wrote that Biden is a "healthy, vigorous, 77-year-old male, who is fit to successfully execute the duties of the Presidency."
The two other septuagenarian Democratic candidates in the race, Massachusetts Sen. Elizabeth Warren, 70, and former New York City Mayor Michael Bloomberg, 77, have also released letters from their doctors saying they're "in excellent health" and "great physical shape" respectively.