Tom Dumont has shared a health update with his fans. The guitarist for the iconic band No Doubt took to his Instagram on Sunday to reveal he was diagnosed with early-onset Parkinson's disease quite some time ago. He says in the emotional video: "I went to my doctor, I went to a neurologist, did a whole bunch of tests, and I was diagnosed with early-onset Parkinson's disease. It's been a struggle. It's a struggle every day." So sad to hear! Of course, fans were concerned about his health - and also his ability to participate in the band's upcoming Las Vegas residency.