Avenged Sevenfold were set to launch their late 2025 South American tour this past Thursday (Sept. 25) in Buenos Aires, Argentina. Alongside it, Avenged Sevenfold shared a nearly three-minute video in which M. Shadows delves deeper into the situation. In addition to the canceled shows in Argentina, Avenged Sevenfold were also scheduled to play parts of Chile, Brazil, Columbia, Mexico and Puerto Rico (via Metal Hammer). I got a vocal chord hematoma back in 2007 from singing Avenged Sevenfold on Rock Band. They can occur anywhere in the body, and the prognosis varies widely.”Unsurprisingly, many other rock and metal musicians (beyond Lemmy and M. Shadows) have also suffered from hematomas.