Brad Arnold, 46, frontman of the popular '90s rock band 3 Doors Down, is battling stage 4 kidney cancer that has spread to his lungs. Arnold, known for hits like 'Kryptonite,' shared a heartfelt anniversary post with his wife Jen, expressing love and gratitude, which triggered an outpouring of support from fans and fellow musicians. Arnold had been quiet on social media for weeks but recently posted a selfie with his wife, celebrating their 16th anniversary and emphasizing his optimism and faith in recovery. Fans and celebrities, including Dustin Lynch and Mark Tremonti, flooded the comments with prayers and well-wishes, asking for his healing. Arnold announced his diagnosis in May 2025, and since then, he has canceled tour dates to focus on treatment. Despite the serious diagnosis, Arnold remains hopeful, relying on faith and the support of his loved ones, sharing messages of purpose and trust in God's plan.