No Doubt guitarist Tom Dumont revealed over the weekend that he has been diagnosed with Parkinson's disease, weeks before the band is set to begin a Las Vegas residency. Dumont explained in an Instagram video that he first started experiencing symptoms years ago, prompting a series of medical appointments with neurologists, tests and eventually a diagnosis. View this post on Instagram Story continues below advertisement "It's a struggle every day," he said. "The good news is I can still play music, I can still play guitar, I've been doing really well.