The Sanders campaign circulated a doctor’s note from Sanders' physician for the last 26 years, Rear Adm. Brian P. Monahan, who is the attending physician of the United States Congress.
Monahan wrote that Sanders is in “very good health” and weighed 179 pounds at his most recent physical exam on Nov. 18, 2015.
Sanders, 74, is the oldest candidate running for president and would be the oldest president elected to office if he wins the race. The next oldest candidates are Donald Trump, 69, Hillary Clinton, 68, and Ben Carson, 64.
"Anyone who follows me on the campaign trail knows that I have a lot of endurance. My health is good," Sanders told ABC’s Jonathan Karl today while campaigning in Des Moines, Iowa.
Clinton released a health statement from her doctor over the summer saying that she is in "excellent physical condition and fit to serve as President of the United States."
Michael Briggs, Sanders' communications director, told ABC News in a statement that the campaign planned "all along" to release medical information from his physician before the primaries and caucuses.