Singer Leona Lewis has opened up about her battle with depression in an open letter to her fans.

The X Factor star tweeted pictures of the two-page handwritten letter, which outlined her “rollercoaster year”.

Speaking about her mental health in recent months, she said, “At some points I felt extremely depressed and other times experienced amazing highs but it got to a place where the downs were outweighing the ups. I'm writing this letter for anyone who has ever felt the same way.”

Leona, who recently left Simon Cowell’s label Syco, said that the adjustment was very difficult for her. “Change is uncomfortable,” she said. “It’s sticky and churning and can be painful. It can turn your world upside down and you either sink or swim.”

The pop star spoke candidly about her depression. “At times it seems overwhelming and I spiral to a dark place,” she explained.

However she added that she is “ready” for what the future brings. “I chose to swim, I chose to go through it and honestly I’m not sure where I’ll end up… So whatever the future may bring, I am ready.”

You can read the full text of the letter below: