(CNN) Sen. Bernie Sanders released a letter from his doctor on Thursday saying he is "in overall very good health."

The letter was issued by Senate physician Brian P. Monahan who has treated Sanders for the last 26 years, according to the letter.

It is customary for presidential candidates to make public their health records during the campaign season. Sanders, who would be 75 on inauguration day, would also be the oldest president ever elected. Ronald Reagan, the current titleholder, was just a couple days shy of his 70th birthday when he first took office.

"Over the years you have been treated for medical conditions including gout, mild hypercholesterolemia, diverticulitis, hypothyroidism, laryngitis secondary to esophageal reflux, lumbar strain and complete removal of superficial skin tumors," Monahan wrote. "Your past surgical history consists of repair of your left and right side inguinal hernias by laparoscopic technique, and a right true vocal cord cyst excision."