The 36-year-old Scottish DJ responded to a fan on Twitter who wrote complimented his energy during sets in 2014. “He went off at EDC that summer,” the user wrote alongside a video from Harris’ performance.

Harris replied, “Interesting year for me 2014, started with me knocking myself off number 1 in the UK and ended with my heart getting restarted in the ER…this sort of stuff happened in between.” Harris did not elaborate further on the post.

In the fall of 2014, Harris withdrew from the MTV European Music Awards. Following the announcement, the BBC reported that the DJ had tweeted, “No EMAs for me this weekend. Got some heart problems. Heading home to see if it can be fixed x.”

Later that year, Harris was diagnosed with an arrhythmia. According to the Mayo Clinic, an arrhythmia occurs “when the electrical impulses that coordinate your heartbeats don’t work properly, causing your heart to beat too fast, too slow or irregularly.”

In 2018, Harris spoke about the lifestyle changes he had made following his diagnosis, revealing on social media that he had quit drinking.

“Aye things are a bit less fun but haven’t had an arrhythmia since 2014,” Harris posted, per The Sun.

He also tweeted at the time, “The last thing I want to do is down 2 bottles of jack daniels a night, live on greggs pasties and sleep on an absolutely stinking bus all year, scream down a mic for 55 minutes and pretend to play a keyboard 5x a week those days are behind me son.”