Doctors insert 2 stents to unblock one of Bernie Sanders' arteries

The oldest candidate in the Democratic race has a history of high cholesterol, but no heart disease in the past.
2:41 | 10/03/19

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Transcript for Doctors insert 2 stents to unblock one of Bernie Sanders' arteries
And now to the race for 2020 and the alarming scene overnight. Senator Bernie Sanders appearing to have trouble on stage. And then the emergency heart procedure right after at a las Vegas hospital. The presidential candidate appearing subdued last night, asking for a chair, saying "It's been a long day." Sanders is 78, and tonight, what he's now saying. Here's ABC's senior national correspondent Terry Moran. Reporter: A warning sign. Bernie Sanders, at a campaign event in Las Vegas last night, apparently feeling worn out and asking an aide for help. Ari, can you do me a favor? Get me a chair up here. It's been long day. Reporter: Not long after, the 78-year-old Sanders complained of chest discomfort and went to a hospital. Doctors discovering that one of Sanders' arteries was blocked and they inserted two stents to unblock it. Sanders has had a history of high cholesterol, but no heart disease in the past. He is the oldest candidate in a race where the top three contenders are over 70, and he would be the oldest president if elected. Sanders recently talking to Dr. Oz about the demands of the campaign. The campaign trail is really not conducive to good health habits, but what I try to do as much as I can is walk. I'm a big walker. Reporter: And he's a famously hard-running candidate, as he showed against Hillary Clinton in 2016. But I think the secretary is right. And that is that the American people are sick and tired of hearing about your damn emails. Thank you. Me, too, me, too. Reporter: Sanders can typically pack three or four events into a day in multiple cities, not missing a beat when he suffered a gash from shower door last March. But he took a short break after the last debate. In the United States of America, we are spending twice as much per capita on health care -- Reporter: Tonight, Sanders' democratic rivals are wishing him a quick recovery. I know everyone here wishes him well, wants to see him strong and back on the trail as soon as possible. Reporter: And late this afternoon, Sanders tweeting his thanks for all the well wishes, add ING adding, "I'm feeling good." And always on message, he noted he was lucky to have good health care, adding, "Medicare for all!" Of course, across the spectrum tonight, everyone pulling for Bernie Sanders. And Terry, what do we know next for senator Sanders, any next step, have they revealed? Reporter: Well, David, you can tell from that tweet his spirits are good. His campaign says his appearances have been canceled for now. Next steps, this usually means, doctors tell us, a couple of days in the hospital and doctors will want to monitor him for a few weeks, so, expect him, for now, to be back on the campaign trail at some point with a new issue to address, perhaps. David? Terry Moran with us tonight. Terry, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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