Halsey has opened up to fans about her secret health battle, declaring “Long story short, I’m lucky to be alive. short story long, i wrote an album.” (sic)

The 29-year-old singer shared a heartfelt Instagram post this week, including a montage of her struggle with illness.

Leukemia is a type of blood cancer, and Blood Cancer UK warns many people living with the disease don’t realise this and miss out on essential treatment and support.

The pop sensation also announced that she will be…