The Loose Women star, 66, confessed she had decided to stop her chemotherapy treatment.
She was diagnosed with colon cancer last year, which has now spread to her lungs and liver. Lynda said her decision to stop the treatment was so she could enjoy one more Christmas with her family.
In a memoir published in the Mail on Sunday Lynda said: "August 13, 2014. Yesterday was the glorious 12th – a day for us to remember because it is also the day I decided when I will die. I am very dramatic, aren't I?
"I know it's not ultimately my decision, but it is my last vestige of control to sit in front of the oncologist and say when I would like to stop having chemo and let the natural way do it's thing.
"I sat down with Michael and Professor Stebbing and announced: 'The time has come to cease and desist. I would love to make one more Christmas, if possible, but I want to stop taking chemo around Novemeber in order to pass away by the end of January."
Following her decision to end treatment, Lynda took to Twitter to thank well wishers and to say she'd written the book in the hope to help other terminal cancer sufferers.
She wrote: "Just one more thing folks I have written this book to help everyone who has cancer or terminal illness. You are not alone.
"And I am just one of thousands going through this. So love and luck to you all x"