Senator Bernie Sanders is being treated for an artery blockage and cancelling his events for the coming days, a campaign official said on Wednesday.

“During a campaign event yesterday evening, Sen. Sanders experienced some chest discomfort,” Jeff Weaver, a longtime adviser to Mr. Sanders, said in a statement. “Following medical evaluation and testing he was found to have a blockage in one artery and two stents were successfully inserted. Sen. Sanders is conversing and in good spirits. He will be resting up over the next few days. We are cancelling his events and appearances until further notice, and we will continue to provide appropriate updates.”

Mr. Sanders, 78, was travelling for a gun forum in Las Vegas that other candidates were also scheduled to attend. He was to travel to California later this week.

Mr. Weaver read the statement to staffers on a quickly assembled conference call at 10:30 Eastern time, according to an aide on the call. No one on the staff asked questions following his statement, which the aide said Mr. Weaver read in measured tones.

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