After the youngest of the three, Alejandra, selected bass guitar as her primary instrument at about age 7, the sisters decided to form a power trio in 2013.

[6] The band first gained widespread notice later in 2014 when, at ages 9 through 14,[7] their YouTube video in which they performed Metallica's "Enter Sandman" went viral among rock fans, eventually earning more than 26 million views.

[8][9][10] The video received attention from Metallica guitarist Kirk Hammett, who offered particular praise for Paulina, saying, "The drummer kicks maximum ass!

[18] During this period the sisters raised funds, including a $10,000 donation each from DeGeneres and the Target Corporation,[18] to attend a five-week training program at Berklee College of Music in the United States.

[33] In August 2020, The Warning signed a five-album deal with Lava Records and began work on a new album with producer David Bendeth.

[38] The six-song EP Mayday was released in October 2021,[2][39] and The Warning embarked on a tour of North America in early 2022, performing more than 30 dates as headliners plus opening for Foo Fighters, Sammy Hagar and the Circle, and Stone Temple Pilots.

[45][46][40] Later that year they toured Canada while supporting Three Days Grace and opened a show for Guns N' Roses in their home city of Monterrey, Mexico.

In September 2023, they performed at the MTV Video Music Awards[49][50] and, in the same month, they opened for Guns N' Roses again one show of the We're F'N' Back!

In Spring 2024, they released five more new singles from the upcoming album: "S!CK", "Hell You Call a Dream", "Qué Más Quieres", "Automatic Sun" and "Burnout".

In July The Warning were featured as artists of the month on MTV Push [59] – a promotional event that includes exclusive videos of them performing songs and also interviews.

[69] For the Spring of 2025, the band announced multiple locations of their upcoming "Keep me Fed" tour: in Mexico (including three nights at Auditorio National), in South-America and also in Europe.

They named Metallica, Muse, My Chemical Romance, Pink Floyd, Queen, Paul McCartney, Neil Peart, David Gilmour, Placebo, Badflower, Paramore, K-pop and J-rock as musical influences.