According to interviews, “Avalanche” is about ADHD and Oliver’s visits to doctors because of his addiction to Ketamine.

“Avalanche” is about ADHD. I guess it’s weird when you’re 25-26 and your doctor tells your brain is missing something. It’s got like a missing link I guess. But at the same time it was a huge release to discover and a massive step in my recovery to find out a huge part of my addiction was self-medicating.

—Oliver Sykes, Music and Riots