New Delhi, Nov. 12 -- K-pop star HyunA earlier collapsed on stage while she was performing at the Waterbomb Macau festival. Before this incident, she had informed her fans that she had undergone rapid weight loss.

"From the end of 50 to changing the front seat, it's so hard. I'm still too old. How much have you eaten?" she posted while showing her weight under 50kg.

Her excessive weight loss, around 10kg within a month, is believed to be the cause behind the collapse.

Losing 5% or more of body weight in 6-12 months is typically considered dangerous. HyunA lost more than 16% of her body weight in 30 days.

"Don't be too attached to your weight. We love you in every way," wrote one of her fans.

"Nooo, girl. We need you to be healthy and...