Pop star Taylor Swift has for the first time revealed specifics of her mother Andrea's battle with cancer, in a new interview.

"While (my mom) was going through treatment (for breast cancer), they found a brain tumour. And the symptoms of what a person goes through when they have a brain tumour is nothing like what we have ever been through with her cancer before. So it is just been a really hard time for us as a family," Taylor said, opening up on the ordeal in an interview to Variety.