The broadcaster, who set up charities Childline and The Silver Line, says she is undergoing tests to assess the best treatment.
The 82-year-old broadcaster, long-time activist and founder of charitieshad"spread", but that she was due to undergo tests to assess possible treatments and that she remained"optimistic".
"At the age of 82, this diagnosis has prompted me to look back over the years, and I want to express my profound thanks to everyone who has made my life so joyful, filled with fun, and with inspiration. "I have been continuously inspired by the courageous children, older people and viewers who have trusted me with their life stories. I have always tried to live up to that trust."As I am sure you will understand, while I am awaiting the results of the tests, I am unable to answer questions.
A trailblazer for female broadcasters, Dame Esther became a household name during her career at the BBC.