Halsey wasn't feeling her best during her BottleRock set Sunday.
The Bad at Love singer, 23, took to Twitter to explain an asthma attack was the reason she she was not on top of her game during her performance at the Napa Valley festival this weekend.
"I just had an asthma attack onstage at @BottlerockNapa and ended up with the medics after my set!!!!" she said.
She seemed upbeat about the incident, however, joking that it was because she didn't work out enough in her younger years.
"This is what I get for walking the mile in high school gym class byeeeeee," the tweet continued.
In a follow-up tweet, she said she had fun at the festival despite the medical complication.
"It was suchhhh a fun set out here in Napa! Heat + Asthma and all! I hope you guys are having fun!" she said.
Halsey is currently on the North American leg of her world tour. She has 18 more stops in North America including New York City, Nashville and Las Vegas before heading to Asia and the United Kingdom.
USA TODAY reached out to Haley's reps for comment.
