The following update on Sting's health was posted on his verified Facebook page:
"As many of you may already know, Sting is undergoing treatment for the injuries he sustained in last night’s match with Seth Rollins. Doctors will continue to evaluate his condition, but he is a man of remarkable health and resiliency, especially at his age and with all he’s endured throughout his stellar career. Therefore, we are optimistic he will have a speedy recovery and return to full health soon. Sting has kept his body in excellent shape, due largely to the guidance he’s received from his personal trainer Jeff Cavaliere (ATHLEAN-X), and we trust this will prove beneficial to the recovery process. As a side note, we later learned the greatest damage to his body took place before the match was over, but being the true professional he is and among the hardest workers to ever step foot in the ring, he insisted to see the match through to the end." -Steve Martinez
Sting was injured during his WWE World Heavyweight Championship match against Seth Rollins at Night of Champions, presumably when he took the bucklebomb. The ringside physician evaluated him for two minutes after he collapsed to the mat when ducking a clothesline. Sting was intent on finishing the match but it was clear something was wrong and a significant injury had occurred. Still, no official diagnosis has been made available while speculation suggests it was some type of neck injury.
You can read this update in its original format below: