NMIXX member Sullyoon performs during a recent world tour appearance in Bangkok. Captured from social media

NMIXX member Sullyoon has opened up about suffering from back pain after fans expressed concern over her recent emotional appearance during the group's world tour.

Through a fan communication platform, Sullyoon addressed the incident in which she was seen crying during a performance.

“I think I may have overexerted myself during the dress rehearsal before the show. It started hurting then,” she said. “I put on a pain relief patch and took some medicine before going to sleep, but when I woke up, it had gotten a little worse.”

The singer revealed that she is currently receiving various treatments, including laser therapy. She also explained that both her agency and medical staff had advised her to rest.