Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) said Tuesday that he should have paid attention to his symptoms in the months leading up to his recent heart attack.

"I must confess that I was dumb," he said while speaking in Burlington, Vt. "I, in the last month or two, just was more fatigued than I usually have been, and I should have listened to those symptoms."

"I want people to pay attention to their symptoms, and when you're hurting, when you're fatigued, when you have pain in your chest, listen to it," he added.

The Democratic presidential candidate also said that he would not release his medical records sooner than originally planned in light of the incident but that he did plan to release them.

JUST IN: While still recovering from his heart attack, Sen. Sanders says he was “dumb” to not listen to his body’s symptoms, and warns that “when you’re hurting, when you’re fatigued, when you have pain in your chest: listen to it.” pic.twitter.com/NUDSMM6Q4v — MSNBC (@MSNBC) October 8, 2019

Sanders, 78, left the hospital last week after suffering what physicians said was a heart attack. He had two stents placed in a blocked coronary artery.

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His campaign confirmed to The Hill on Thursday that he will participate in the next Democratic debate on Oct. 15.

His hospitalization has highlighted the issue of age among the 2020 contenders. Biden and other top Democratic candidates Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) and former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE are all in their 70s. President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE is 73.