The 58-year-old guitarist — who joined the band in 1988 — revealed he started experiencing symptoms "a number of years ago" and admitted it's been a "struggle every day" but he's currently "doing well" and is still able to play music.

In a video posted on Instagram, he explained he's been getting ready for No Doubt's upcoming residency at the Sphere in Las Vegas and he wanted to share his health news with fans.