https://www.usmagazine.com/celebrity-news/news/general-hospitals-kirsten-storms-reveals-shes-recovering-from-brain-surgery-ill-be-back-at-work-soon/

The Disney Channel Kim Possible alum revealed on her Instagram Stories that she was wearing a neck brace following the procedure that called for removing a cyst from her brain last week. “So I’ve not really spoken about this much, or at all actually. Less than 48 hours ago, I had brain surgery, hence the neck brace. It was on the lower portion of my brain,” Storms explained, joking that no Instagram filter could really make her look normal.

She had a cyst that apparently split in two and it was causing pressure not only on her brain, but also her brain stem (that's from what I read).

She did make it clear that it wasn't cancer.