Pop singer Ariana Grande says she has been struggling with some symptoms of post-traumatic stress disorder following last year's suicide bomb attack at the end of her concert at Manchester Arena.

The 24-year-old pop star told British Vogue she does not like to talk about her experiences because so many people suffered much worse fates in the May 22, 2017 attack that claimed 22 lives and injured 59.

"I know those families and my fans, and everyone there experienced a tremendous amount of it as well," she said.

"Time is the biggest thing. I feel like I shouldn’t even be talking about my own experience - like I shouldn’t even say anything. I don’t think I’ll ever know how to talk about it and not cry."