Hillary Clinton, Chris Christie and Jeb Bush have all previously released notes from their respective doctors giving their seals of approval despite also noting various medical procedures and medications.
The doctors for Trump, Clinton and Bush all noted their patients' "excellent" physical condition.
Clinton and Christie had two of the most visible recent health issues. Clinton, 68, suffered a concussion in 2012, resulting in double vision. She had to wear special glasses for two months to help correct the problem.
Her physician, Dr. Lisa Bardack, also noted in July that a blood clot was found near Clinton's brain after the 2012 concussion, prompting the use of blood thinners, which she still takes.
Christie, 53, underwent lap-band surgery in February 2013 and "has been losing weight steadily since then," according to Dr. Rachana Kulkarni, who summarized his health status in a letter released in October 2013, which was used to declare his ability to serve as governor of New Jersey.
Bush's campaign posted a letter from his physician, Dr. Alberto Mitrani, on its website in October. It detailed previous issues, including vitamin D insufficiency and fluctuating blood pressure, which have been treated with daily vitamins and "intensification of exercise, careful eating habits and loss of weight," respectively.
The former Florida governor, 62, is the only candidate whose doctor noted a previous knee surgery.
No other candidates have formally released letters from their physicians, but Carly Fiorina has written about her health history in her book, detailing her breast cancer diagnosis and subsequent double mastectomy. Fiorina, 61, also noted her status as a cancer survivor when health care was discussed at one of this year's debates.