The 55-year-old artist's mother died from a brain aneurysm in September 1974 and the singer admits losing her left a "hole" in his heart, reported Female First.
"I realised aged 14, when my mother suddenly passed away at her own father's graveside, that I had a hole in my heart."
To deal with his grief, Bono turned to music and that turned into his life.
"I didn't know at the time, as I filled it with music. I became an artist through her absence and I owe her for that. I thought the rage I had was a part of rock 'n' roll but the rage was grief."
